JP5296480B2 - Hanging structure type frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate, in use of a brace erected on an optional layer within a frame as a suspension member for supporting an intermediate layer, the difference in rigidity between the layer with the brace erected thereon and a layer free from the brace to avoid damage in the layers by interlayer deformation resulting from the difference in rigidity. <P>SOLUTION: In a frame having a plurality of layers composed of columns 1 and beams 2, the brace 3 is erected between beams 2 of a certain layer and the lower or upper layer thereof, an intermediate column 4 is erected at least between the beams 2 and 2 of the layers with the brace 3 erected therebetween, and the beam-side end part of the brace 3 is connected to the beam 2 so as to be relatively movable in the length direction of the beam 2. Concretely, the brace 3 is connected to the beam 2 while supporting the beam 2 to be relatively movable in its length direction to the beam 2 to cause the brace 3 to bear at least a part of a vertical load on the beam 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a suspension structure type frame using a brace installed in an arbitrary layer in a frame as a suspension material for supporting an intermediate layer.

  The structure of the form using the brace as a suspension material for supporting the load of the intermediate layer can bear the load of the upper floor from the floor including the columns and beams to which the lower end of the brace is connected, There is an advantage that the pillar can be absent from the floor below the floor to which the lower end of the brace is connected (see Patent Document 1).

  Braces as suspension materials are erected in any layer and mainly function as tension materials. In addition to braces as suspension materials, it is possible to suspend by installing an inter-column (middle column) between beams on the upper and lower adjacent floors. A compression force that cannot be borne by the material may be borne by the studs (see Patent Document 2).

Japanese Patent No. 2926106 (Claim 1, column 3, lines 8 to 19, column 3, line 42 to column 4, line 3, FIG. 1) Japanese Patent No. 4010981 (Claim 4, paragraph 0028, FIG. 5)

  As described above, the brace as a suspension material functions as a tensile material, but since the horizontal force acts on the frame and the brace bears the tensile force, the rigidity of the layer in which the brace is installed increases, so the brace is installed. The rigidity of the layer is increased more than the rigidity of the other layers, and the construction layer of the brace is relatively difficult to deform. This becomes prominent when a stud is installed between beams on the floor adjacent to the top and bottom in addition to the brace as in Patent Document 2.

  FIG. 6 (a) shows a frame in which studs (medium columns) are installed on the bracing layer. Normally, both ends of the brace are connected to the columns and beams that make up the frame, so the brace acts to prevent the deformation when the frame is deformed. Hard to occur. As a result, as shown in FIG. 6 (b), the frame cannot be uniformly deformed over all layers, and the deformation concentrates on a relatively rigid layer, so that it is adjacent to the bracing layer. This increases the possibility of damage to the layer.

  In view of the above background, the present invention proposes a suspension structure type frame that does not cause a difference in rigidity between a layer in which braces are erected and a layer in which braces are not erected.

In the suspended structure type frame according to claim 1, a brace is constructed in a section from a column of an arbitrary layer to a beam below it in a multi-layered frame composed of columns and beams, and at least this brace is installed. A middle pillar is erected between the upper floor beam and the lower floor beam
The upper end of the brace is connected to the column, or the junction between the column and the beam, or the vicinity thereof, and the lower end of the brace is the intermediate portion in the longitudinal direction of the beam on the lower floor side of the section where the brace is installed. And connected to a state of bearing a vertical load received by the beam on the lower floor side through the middle column, and connected to the beam in a relatively movable manner in the length direction of the beam,
The lower end of the middle pillar is connected to the beam on the lower floor to which the lower end of the brace is connected, and the middle pillar bears a vertical load from the upper floor beam to which the upper end is connected as a compressive force. And
The brace is in a state where it bears a vertical load transmitted as a tensile force through the middle column to the beam on the lower floor side to which the lower end portion is connected . The position and the number of layers in which the brace is constructed are arbitrary, and the layer to which the upper end of the brace is connected may be an upper layer than the layer to which the lower end is connected.
In the suspended structure type frame according to claim 2, a brace is constructed in a section from a beam of an arbitrary layer to a column below it in a multi-layered structure composed of columns and beams, and at least the braces are installed. A middle pillar is erected between the upper floor beam and the lower floor beam
The upper end of the brace is connected to a middle portion in the longitudinal direction of the beam on the upper floor side of the section where the brace is installed, and is relatively movable in the longitudinal direction of the beam, and the upper end through the middle column. It is connected to a state that bears the vertical load received by the beam on the floor side, and the lower end of the brace is connected to the column, or the junction between the column and the beam, or the vicinity thereof,
The upper end of the middle pillar is connected to the upper floor beam to which the upper end of the brace is connected, and the middle pillar bears a vertical load from the lower floor beam to which the lower end is connected as a tensile force. And
The brace is in a state of bearing a vertical load transmitted as a compressive force through the middle column to the beam on the upper floor to which the upper end of the brace is connected.

  Braces are installed in a certain layer (between floors), for example, in the section from the column or the junction between the columns and beams, or in the vicinity thereof (hereinafter referred to as columns) to the middle in the longitudinal direction of the beams in other layers. One end portion (upper end portion or lower end portion) is connected (coupled) to a column or the like, and the other end portion (lower end portion or upper end portion) is connected to an intermediate portion of the beam so as to be relatively movable. The brace bears the vertical load of the layer on which it is laid (the brace straddles), and this vertical load is applied to the column in the frame consisting of columns and beams, specifically the column in the frame where the brace is laid. Is transmitted through the upper end or the lower end.

  The middle column is installed between the beams of each floor over at least the layer (between floors) where the brace straddles, and transmits the vertical load to the brace while bearing the vertical load of the layer where the middle column is installed. The middle column is installed at least above the layer over which the brace straddles to transmit the vertical load acting on the beam in the layer over which the brace straddles. “Vertical load acting on the beam” refers to the vertical load acting on the beam from the upper floor through the middle pillar installed on the beam and the vertical load acting on the beam from the lower floor through the middle pillar installed below the beam. Including.

  For example, when the braces are installed from the 3rd floor to the 5th floor (3rd and 4th floors), one end of the brace is connected to a pillar of the 5 (3) floor and the other end is a beam of the 3 (5) floor Is connected to the middle portion in the longitudinal direction. In this case, the middle pillar is constructed between at least the third-floor beam and the fifth-floor beam. “At least” means that it is constructed between the beam on the third floor and the beam on the fifth floor or higher, or between the second floor and below and the beam on the fifth floor. The middle pillar is constructed for each layer (inter-floor) like a stud, but includes a through pillar constructed continuously in a plurality of layers.

  The floor to which the lower end of the middle column is connected or the floor to which the upper end is connected is determined in principle by applying a tensile force or compressive force to the brace. The floor to which the lower end of the middle pillar is connected is determined, and when the compressive force is applied, the floor to which the upper end of the middle pillar is connected is determined.

  Since the vertical load acting on the beam is transmitted to the brace from the connection position to the beam, and the brace transmits the vertical load to the frame through the connection position to the column, etc., a tensile force or a compressive force acts on the brace. Whether to do this depends on whether the lower end or upper end of the brace is connected to either a beam or a column.

  When the lower end of the brace is connected to the middle part of the beam and the upper end is connected to a column or the like, the vertical load acting on the beam is transmitted to the lower end of the brace and transmitted to the frame through the upper end of the brace. Therefore, the brace bears a tensile force and transmits it as an axial compressive force to a column or the like (frame) through the upper end. In this case, since the vertical load acting on the beam is transmitted from the beam to which the lower end of the middle column is connected to the brace, the middle column uses the vertical load from the upper floor beam to which the upper end is connected as a compressive force. It bears and transmits to the beam on the lower floor where the lower end is connected and the brace is connected.

  When the upper end of the brace is connected to the middle part of the beam and the lower end is connected to a column or the like, the vertical load acting on the beam is transmitted to the upper end of the brace and acts on the beam through the lower end of the brace. Since the load is transmitted to the brace, the brace bears a compressive force, and transmits the compressive force as an axial compressive force to a column or the like (frame) through the lower end.

  In this case, since the vertical load acting on the beam is transmitted from the beam connected to the upper end of the middle column to the brace, the middle column uses the vertical load from the beam on the lower floor to which the lower end is connected as the tensile force. It bears and transmits to the beam on the upper floor where the upper end is connected and the brace is connected. After all, the end of the brace on the beam side is movable relative to the beam in the length direction, and is connected to the beam in a state of bearing (supporting the beam) at least a part of the vertical load acting on the beam. .

  The center column may be connected to the beam to which the end of the brace is connected at any part, but in order not to apply a bending moment to the section between the end of the brace, the end of the brace Is suitably connected to the connected part. The middle pillar is erected between adjacent beams above and below each layer, up to a beam on an upper floor and a beam on a lower floor. When there are multiple layers in which the middle pillar is installed, the middle pillar is continuous, so that the middle pillar supports the vertical load on the upper floor as described above, and also supports the vertical load on the lower floor. You can also.

  Since the brace bears the vertical load of the layer where it is installed and transmits it to the column (outer column) in the construction surface, the brace is placed symmetrically with respect to the middle column in distributing the vertical load to the column It is reasonable to be When the braces are installed symmetrically with respect to the middle column, the lower ends of the braces or the upper ends can be connected to each other, and the vertical load from the beam received by the lower ends of the braces or the upper ends can be obtained by the connection. Since both braces can be shared, the vertical load from the beam can be dispersed and transmitted to the columns in the construction surface.

  In addition, since the ends of both braces are connected to each other, the braces do not have to be in a cantilevered state, so the braces can be connected to the beam so that no bending moment is applied to the braces due to vertical load. It is. In addition, since the ends of the braces are connected to each other, the beam can be supported by the brace in a surface contact state, so that it is possible to transmit most of the vertical load acting on the beam to the brace.

  The end of the brace on the beam side is connected so as to be relatively movable with respect to the beam. When a horizontal force exceeding a certain magnitude is applied to the brace, the upper end and the lower end of the brace are connected. It means that one of the ends is connected in a state of moving relative to the beam, and includes a connection state in which the brace bears some horizontal force and a connection state in which no horizontal force is borne. Specifically, rolling bearings, sliding bearings, elastic sliding bearings, seismic isolation bearings, etc. are interposed between the beam end of the brace and the beam, and then act on the beam to which the brace is connected. The brace bears a vertical load, and the brace and the beam are connected in a state where only the tensile force or the compressive force, which is the axial force, acts on the brace.

Among these bearings, when a rolling bearing that allows relative movement between the brace and the beam or a bearing such as a sliding bearing is interposed (Claim 5 ), the space between the brace and the beam is displaced when the interlayer is displaced. Since there is almost no resistance when the relative movement is about to occur, the brace substantially bears only the vertical load and does not bear the horizontal load.

  Because the end of the brace is connected to the beam so that it can move relative to the beam, when a horizontal force is applied to the layer containing the beam, the brace does not substantially bear a horizontal load. Only bear the vertical load of the layer containing the beam to which the braces are connected. As described above, when the lower end of the brace is connected to the beam and the upper end is connected to a column or the like, the brace bears a vertical load as a tensile force, the upper end of the brace is connected to the beam, and the lower end. When is connected to a pillar or the like, the brace bears a vertical load as a compressive force.

  Since the brace substantially bears only the vertical load and does not bear the horizontal load, the brace does not resist the horizontal force acting on the frame, so the rigidity of the layer where the brace is erected (erection layer) Is not raised by the presence of the brace, and in the entire frame, the difference between the rigidity of the bracing layer and the rigidity of the other layer (non-erection layer) does not occur due to the brace.

  Therefore, as shown in Fig. 1- (b), the rigidity of each layer can be made constant from the lower layer to the upper layer or continuously changed regardless of the presence of the brace and the middle pillar. Uniform (bending) deformation is possible. By eliminating the extreme difference in rigidity between the bracing erection layer and the non-erection layer, there is no layer in the entire frame that is extremely deformed when a horizontal force is applied (interlayer displacement). This reduces or eliminates the possibility of causing damage to specific layers adjacent to the bracing layer.

  In addition, as shown in Fig. 5- (a), in a normal column / beam frame, it is necessary to transmit the load on the slab to the column while the beam is supported on each floor. ) Becomes larger, and there is a limit to restraining the height of the building. In contrast, in the present invention, since the brace supports the vertical load on the slab that the beam should support, it is not necessary to give the beam as much as the case of bearing the vertical load on the beam, and the beam formation can be suppressed. Therefore, as shown in (b), it becomes possible to make the floor height and the building height smaller with the suppression of beam formation than when the beam bears a vertical load.

  For example, as shown in FIG. 2, when a multi-span column-free space is secured on the lower floor in the frame, normally, the beams constituting the column-free space receive the vertical load received from the upper-floor column connected to it. It is necessary to make the beam extremely large because it needs to flow through the pillars on both sides. On the other hand, in the present invention, the brace and the middle column are connected to the beam constituting the column-free space, so that at least a part of the vertical load acting on the beam can be transmitted to the columns (outer columns) on both sides. Therefore, there is no need to increase the beam formation. As a result, it is possible to set the same span as the beam of the span other than the non-column space, and it is possible to unify the beam formation of all layers while forming the column-free space.

  In addition, for example, there was a law that had to secure a floor height of 3m or more before, for example, school buildings, but now that the restriction on floor height has been eliminated, it is possible to design to reduce the floor height. Yes. However, since there is no change in the assumed load (design load) on the floor, the beam formation cannot be changed immediately. If the height of the floor is simply reduced while keeping the beam constant, the distance from the floor to the bottom of the beam decreases, and the column becomes shorter. It is because the nature becomes high.

  On the other hand, in the present invention, the load acting on the beam can be passed through the frame through the braces connected to the beam as described above, so that the beam formation can be reduced even if the design load on the floor does not fluctuate. Therefore, it is possible to avoid reducing the distance from the floor to the bottom of the beam, and it is possible to avoid the shortening of the column and the brittle fracture of the column due to it.

When braces are installed across multiple layers, the braces are used in order to free the relative displacement between the braces and the beams so that the braces can exert the function of bearing the vertical load of the layers straddled by the braces. It is not connected to the beam of the passing layer (intermediate floor) (Claim 3 ), and the edge of the brace and the beam of the intermediate floor is cut. When braces are installed across multiple layers in a structure that includes a column (outer column) and a beam connected at both ends, the brace intersects the beam of the layer through which it passes. In this case, both ends of the brace are constrained by the pillars (outer pillars) and the beam in the construction surface, so that the beam from the intermediate floor changes to the brace when the interlayer is displaced. A horizontal load is transmitted, and the rigidity of the bracing layer is increased.

  On the other hand, since the brace is not connected to the beam of the layer through which the brace passes, the relative displacement between the brace and the beam through which the brace passes becomes free, so the brace receives a horizontal load from the beam on the intermediate floor when the interlayer is displaced. There is nothing. Therefore, even when the brace extends over a plurality of layers, the above-described purpose of not causing the horizontal load to be applied to the brace and not increasing the rigidity of the bracing layer is achieved. In this case, a state in which the brace is not connected to the beam on the intermediate floor is obtained by combining the beam and the brace in such a manner that the beam straddles both sides of the brace or the brace straddles both sides of the beam.

Since the center column only needs to bear the vertical load of the beam to which it is connected, it does not necessarily have to be joined to the beam. Like the brace, it is close to the end of the brace that is connected to the beam in a relatively movable manner. In some cases, the end of the middle column located at is connected to the beam so as to be relatively movable in the length direction (claim 4 ).

  In this case, since the middle column is movable relative to the beam in the length direction, the middle column does not bear a shearing force, so the middle column is also placed in a state of bearing only a vertical load. Therefore, both the brace and the middle column do not behave as a resistance element (seismic element) against the horizontal force acting on the frame. Therefore, there is no difference in rigidity against horizontal force between the layer where the brace and middle pillar are installed (erection layer) and the layer where it is not installed (non-erection layer) in the frame. It is possible to deform more uniformly as a whole than in the case where it is made, and it is ensured that damage to the layer adjacent to the layer where the brace and the middle pillar are installed is avoided.

  A brace is installed from one layer to the lower layer or the upper layer beam, a middle column is installed between the beams of the layer where this brace is installed, and the end of the brace on the beam side is the length direction of the beam. Since it is connected to the beam so as to be relatively movable, it is possible to prevent the brace from bearing a horizontal load.

  As a result, since the rigidity of the layer in which the brace is installed does not increase due to the presence of the brace, the difference between the rigidity of the brace installation layer and the rigidity of the other layers may occur in the entire frame due to the brace. The damage in the layer adjacent to the brace erection layer can be avoided.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1- (a) shows a structure in which a brace 3 is constructed between a certain layer and a lower layer or an upper layer beam 2 in a multi-layered structure composed of columns 1 and beams 2, and at least the brace 3 is constructed. A suspended structure-type frame in which a middle column 4 is erected between beams 2 and 2 in a layer, and an end of the brace 3 on the beam 2 side is connected to the beam 2 so as to be relatively movable in the length direction of the beam 2. A specific example is shown. Hereinafter, a layer in which the brace 3 and the middle pillar 4 are installed is referred to as an installation layer 5 for convenience. The construction layer 5 may be a single layer as shown in FIG. 2 or a plurality of layers as shown in FIGS.

  The frame that constitutes the suspended structure type frame has pillar 1 and beam 2 as the basic elements. However, depending on the form of the high-rise or low-rise frame, aspect ratio, etc., the multi-layer seismic elements (seismic walls, (Or braces) may be arranged, and the core may be arranged on a part of the plane. The pillar 1 mainly refers to an outer pillar, but may include a middle pillar other than the middle pillar 4 that is constructed on the construction layer 5 and transmits a vertical load to the brace 3.

  The end of the brace 3 on the side other than the beam 2 side is connected to the column 1 or a joint between the column 1 and the beam 2 (hereinafter referred to as the column 1 side). The end of the brace 3 on the side of the column 1 is connected to the column 1 by a pin connection or the like in a state where no bending moment from the column 1 or the beam 2 is transmitted, and the column 1 has a tensile force as an axial force of the brace 3, Or, only compressive force is applied. It is appropriate that the end of the brace 3 on the side of the column 1 is connected to the junction between the column 1 and the beam 2 so that a local bending moment does not act on the column 1. In that case, the brace 3 is joined to a gusset plate projecting from the joint between the column 1 and the beam 2.

  The end of the brace 3 on the beam 2 side is connected to the beam 2 so as to be relatively movable in the length direction, and the middle column 4 is connected to the beam 2 to which the end of the brace 3 on the beam 2 side is connected. Connected. Since the middle column 4 transmits the vertical load borne by the middle column 4 to the brace 3 through the beam 2 to which the brace 3 is connected, the middle column 4 is connected to the connection part of the brace 3 and the beam 2 or a part close thereto. The The brace 3 is connected to the beam 2 so as to be relatively movable. The brace 3 is connected to the beam 2 while supporting the beam 2 so as to be relatively movable with respect to the beam 2 in the length direction. say. The brace 3 supporting the beam 2 means that the brace 3 bears at least a part of the vertical load acting on the beam 2.

  In FIGS. 1 to 9, the upper end of the brace 3 is connected to the column 1 (column / beam joint), and the lower end is connected to the beam 2 below the joint so that a tensile force acts on the brace 3. An example in the case of being installed in the frame in such a state. 10 to 12, the upper end of the brace 3 is connected to the beam 2, and the lower end is connected to the column 1 (column / beam joint) below the beam 2 so that a compressive force acts on the brace 3. An example of the case is shown. The middle pillar 4 is installed between the beams 2 and 2 in the layer where at least the brace 3 is installed.

  Since the brace 3 is installed in the construction surface of the frame and bears the vertical load of the layer in which the brace 3 is installed and is transmitted to the columns 1 in the composition surface, the columns 1, 1 located on both sides in the composition surface It is constructed symmetrically with respect to the middle column 4 in a certain construction surface in the frame so that the vertical load can be transmitted in a distributed manner.

  FIG. 1- (a) shows a case where the erection layer 5 is disposed at two locations near the upper layer and straddling the two layers as an example of a case where the frame is a high layer. In this example, the upper end of the brace 3 is connected to the column 1 and the lower end is connected to the beam 2, so that the brace 3 bears the vertical load received by the beam 2 to which it is connected as a tensile force. The middle column 4 transmits the vertical load from the beam 2 closer to the upper layer among the beams 2 constituting the installation layer 5 to the beam 2 on the lowest floor of the installation layer 5. The vertical load of the erection layer 5 is transmitted to the beam 2 on the lowest floor in the erection layer 5, and then transmitted through the brace 3 to the column / beam junction to which the upper end is connected, and is borne by the column 1. .

  In the case of FIG. 1- (a), when a horizontal force is applied to the frame, the lower end of the brace 3 can freely move relative to the beam 2 in the length direction as shown in FIG. As the upper end moves following the deformation (relative movement), the lower end of the brace 3 moves relative to the beam 2, so that the brace 3 does not bear a compressive force due to a horizontal force.

  When the lower end of the brace 3 is connected (joined) to the beam 2 in a state in which the relative movement with respect to the beam 2 is restricted as shown in FIG. 1- (c), the upper end of the brace 3 is involved in the movement. Therefore, since the lower end portion of the brace 3 does not move relative to the beam 2, the brace 3 bears a compressive force due to a horizontal force and increases the rigidity of the layer on which the brace 3 is installed. As a result, since the rigidity of the erection layer 5 is larger than the rigidity of the other layers, the deformation of the entire frame when the frame receives a horizontal force becomes a discontinuous shape as shown in FIG.

  In the case of FIG. 1- (c), the upper end and the lower end of the middle column 4 are connected to the beam 2, the lower end of the brace 3 is connected to the connection part between the beam 2 and the middle column 4, and the upper end is the column 1 and the beam. 2, the brace 3 located on the compression side (left side in the figure) bears the compressive force with respect to the middle column 4, and the brace 3 located on the tension side (right side in the figure) is tensile. Bear power. Thus, since the brace 3 resists horizontal force in any direction, the beam 2 on the lower floor to which the lower end of the middle column 4 is connected cannot freely move relative to the beam 2 directly below it.

  As a result, the deformation amount due to the horizontal force of the erection layer 5 is smaller than the deformation amount of the layers other than the erection layer 5, and the entire frame is deformed as indicated by a broken line. As can be seen from the broken line, the existence of the erection layer 5 makes it easier for deformation to concentrate on the layer adjacent to the erection layer 5, and damage to the adjacent layer is more likely to occur.

  On the other hand, in the case of the present invention shown in FIG. 1- (b), as described above, the end of the brace 3 on the beam 2 side is connected to the beam 2 so as to be relatively movable in the length direction. The brace 3 does not increase the rigidity of the erection layer 5 because it is slidable with respect to the beam 2 because it is not connected to the beam 2. Accordingly, as indicated by the broken line in FIG. 1- (b), the brace 3 and the middle column 4 can move relative to the beam 2, so that in the entire frame, the amount of deformation between the erection layer 5 and the layer adjacent to it. This difference is less likely to occur and can be uniformly deformed over all layers.

  FIG. 2 shows an example in which a multi-span (three-span) space (column-free space) is secured under the erection layer 5 as an example of a low-layer (three-layer) frame. In this case, the beam 2 to which the brace 3 is connected needs to be larger than the beam 2 on the upper floor because it transmits the vertical load on the upper floor to the pillars 1 and 1 on both sides. Because the brace 3 connected to the beam 2 bears the vertical load that the beam 2 should bear, the beam 2 does not have to have the original structure, and has the same structure as the beam 2 on the upper floor. That's fine.

  In this example, the upper end of the brace 3 is connected to the column 1 and the like, and the lower end is connected to the beam 2 on the third floor so as to be relatively movable. A specific connection example between the brace 3 and the beam 2 will be described later. The load on the beam 2 on the fourth floor is borne as a compressive force on the middle column 4 and transmitted to the beam 2 on the third floor, but the lower end of the brace 3 is connected to the beam 2 on the third floor. The load transmitted to the beam 2 on the floor is borne by the brace 3 as a tensile force and transmitted to the column 1 to which the upper end is connected.

  1 and 2, two middle columns 4 are connected to one beam 2, but the lower end portion of the middle column 4 is a connection position between the brace 3 and the beam 2 or its Connected nearby. Corresponding to the fact that there are two middle pillars 4 per beam 2, there is a space between the lower ends of the two braces 3, 3 by the distance between the middle pillars 4, 4. The lower end portions of 3 and 3 are connected to each other by a connecting member 33 described later, and are integrated. The ends of the braces 3 and 3 on the side connected to the beam 2 may be connected by the connecting member 33 even when there is only one middle post 4 as shown in FIG.

  FIG. 3 shows an example of a pillar type frame in which the lowest layer is a column-free space (multi-span) having a height of two layers. Here, the middle column 4 is arranged in the middle in the span direction in the construction surface, and the brace 3 is installed between the beam 2 on the lowermost floor and the column 1 on the uppermost floor symmetrically with respect to the middle column 4. The lower end of 3 is connected to the beam 2 and the upper end is connected to the pillar 1 on the uppermost floor. In this example, the lower ends of the two braces 3 and 3 are connected to the same position of the beam 2 in correspondence with the middle column 4 being located in the intermediate portion in the span direction of each layer. In the drawing, the lower ends of the braces 3 and 3 are connected by a connecting member 33 shorter than the example of FIG. 2, but can also be directly connected.

  In this case, a vertical load on the beam 2 to which the upper end is connected acts on the middle column 4 of each floor, and a part of the vertical load is from the beam 2 to which the lower end of the middle column 4 is connected to columns on both sides thereof. 1 and 1 are transmitted. On the other hand, since a part of the vertical load acting on the middle pillar 4 is transmitted to the middle pillar 4 in the lower floor, it is finally located on the lowest floor of the erection layer 5 and the lower end of the brace 3 The vertical load of the upper floor acts on the beam 2 to which is connected. The brace 3 bears the vertical load of the erection layer 5 as a tensile force and transmits it to the column 1 through the upper end. Although the vertical load of the erection layer 5 acts on the beam 2 positioned at the bottom of the erection layer 5, the brace 3 bears this vertical load, so that the beam 2 itself positioned at the bottom acts on the vertical load. It is not necessary to have a cross section (composition) that can bear the load.

  As shown in FIGS. 1 and 3, when the brace 3 is installed over a plurality of layers, the brace 3 passes in order not to transmit a horizontal load from the beam 2 of the layer through which the brace 3 passes to the brace 3. The brace 3 and the beam 2 on the intermediate floor are placed in a state where they can freely move relative to each other without being connected to the beam 2 on the layer (intermediate floor). Specifically, as shown in FIG. 4A, the beam 2 has a shape straddling the brace 3, or the brace 3 has a shape straddling the beam 2 as shown in FIG. 2 can move relative to each other.

  4A shows that the beam 2 is composed of two beam members 21 and 21 arranged in parallel in the width direction of the beam 2, and the two beam members 21 and 21 sandwich the brace 3 in the width direction. This shows a case where the beam 2 can be moved relative to the brace 3. The two beam members 21 and 21 arranged in parallel are located on both sides in the width direction of the brace 3 in order to avoid a collision when a relative movement occurs between the brace 3, but behave integrally with each other. If necessary, they are connected by a splice plate 22 or the like.

  The ends of the beam members 21, 21 on the column 1 side are joined to the column 1 in an integrated state or in an independent state. As shown in FIG. 4B, a clearance for avoiding a collision when there is a relative displacement in the width direction between the beam members 21 and the brace 3 is secured. FIG. 4B is a cross-sectional view in a direction perpendicular to the axis of the beam member 21 in FIG.

  In FIGS. 4A and 4B, in order to ensure the continuity of the beam 2 in the axial direction, the beam member 21 having a shape obtained by dividing the beam 2 into two in the width direction is used. A method for connecting to the brace 3 so as to be relatively movable is arbitrary. For example, the connection part with the brace 3 which is a partial section of the beam 2 in the axial direction may be constituted by two beam members arranged in parallel, and the other part may be constituted by one beam member. In FIGS. 4A and 4B, C-shaped steel is used for the beam member 21, but the cross-sectional shape of the beam member 21 is not limited.

  A slab 8 is constructed or laid on the beam member 21 as shown in FIG. 4- (b). Since the brace 3 penetrates the slab 8, the region of the slab 8 through which the brace 3 penetrates is braceed. 3 is cut out to allow relative movement with respect to the slab 8, and an opening 8a is formed. The length (section) of the opening 8a formed in the slab 8 has a size commensurate with the amount of relative movement assumed between the brace 3 and the beam 2. In FIG. 4A, the range of the opening 8a of the slab 8 is indicated by a broken line. A state when the brace 3 moves relative to the slab 8 in one side in the horizontal direction is indicated by a chain line in FIG.

  Fig. 4- (c) shows that the brace 3 is composed of two brace members 31 and 31 arranged in parallel, and the brace 3 is connected to the beam 2 by sandwiching the beam 2 consisting of one member in the width direction. This is the case when it is installed in a state where it is not. The brace materials 31 and 31 are integrated as a brace 3 by being constrained to each other by a splice plate 32 or the like. In this case, the brace 3 can be freely relatively moved in the length direction of the beam 2, and can be relatively moved in the length direction of the brace 3 as long as the splice plate 32 does not contact the beam 2. FIG. 4D is a cross-sectional view in the direction perpendicular to the axis of the beam member 21 in FIG. In FIG. 4- (c), although the H-section steel is used for the brace material 31, this cross-sectional shape is not ask | required.

  FIGS. 5A and 5B show a comparison between a frame having the brace 3 and the middle pillar 4 (erection layer 5) of the present invention and a frame without the brace 3. FIG. When there is no brace 3 of the present invention that bears the vertical load of each layer as shown in (a), it is necessary to transmit the vertical load of each floor to the columns 1 and 1 to which the beams 2 of each floor are connected on both sides. Therefore, the beam 2 needs to have a cross section (composition) sufficient to withstand the vertical load, and the height of the floor becomes a size suitable for the beam formation.

  On the other hand, as shown in (b), for example, by installing a brace 3 between the beam 2 on the third floor and the beam 2 on the fifth floor, the vertical load that the beams 2 from the third floor to the fifth floor should support. Is transmitted to the pillars 1 and 1 on both sides, and the beams 2 from the 3rd floor to the 5th floor (the 3rd and 4th floors) need only bear a part of the vertical load on each floor. Therefore, the formation of the beam 2 from the third floor to the fifth floor is smaller than that without the brace 3, and the floor height can be reduced correspondingly. The middle pillar 4 constructed between the beams 2 and 2 from the third floor to the fifth floor may transmit the load on the upper floor beam 2 to the lower floor beam 2, for example, the fifth floor beams 2 and 6. The middle column 4 installed between the beam 2 on the floor and the beam 2 on the sixth floor may transmit the load on the beam 2 on the sixth floor to the beam 2 on the fifth floor. What is necessary is just to transmit a load to the beam 2.

  6A shows a conventional frame in which the end of the brace 3 on the beam 2 side is connected to the beam 2 (pin connection), and the end of the middle column 4 is connected to the beams 2 and 2 (pin connection). An example is shown. (B) shows a deformation | transformation state when the frame shown to (a) receives horizontal force. In this case, since the end of the brace 3 on the beam 2 side is connected to the beam 2, the brace 3 resists horizontal force (bears horizontal force), and therefore the rigidity of the erection layer 5 of the brace 3 is brace. It is larger than the rigidity of the layer without 3. Accordingly, the three and four layers with the brace 3 are less likely to be deformed than the one, two, and five or more layers without the brace 3, so that the deformation shown in FIG.

  On the other hand, in the present invention, as shown in FIG. 7- (a), the end of the brace 3 on the beam 2 side is connected to the beam 2 so as to be relatively movable, so that the brace 3 resists horizontal force. Therefore, the rigidity of the construction layer 5 of the brace 3 is the same as or equivalent to the rigidity of the other layers. Therefore, all the layers including the erection layer 5 of the brace 3 are uniformly deformed with respect to the horizontal force, and exhibit deformation properties as shown in FIG.

  8 and 9 show a specific example of connection between the brace 3 and the beam 2 in which the lower end of the brace 3 which is the end of the brace 3 on the beam 2 side supports the beam 2 so as to be movable relative to the beam 2. . When the lower end portion of the brace 3 supports the beam 2 so as to be relatively movable, the lower end portion of the brace 3 wraps around the lower side of the beam 2. Therefore, at the portion where the lower end portion of the brace 3 and the beam 2 intersect, Some sections are discontinuous in the length direction (axial direction).

  FIG. 8 shows an example of connection between the brace 3 and the beam 2 when the beam 2 is constituted by two beam members 21 and 21 arranged in parallel in the width direction of the beam 2 as in FIG. As described above, the connection portion of the beam 2 with the brace 3 may be composed of two beam members arranged in parallel, and the other portion may be composed of one beam member. When the lower end of the brace 3 is connected (supported) to the beam 2, the brace 3 bears a vertical load from the middle pillar 4 and transmits it to the pillars 1 and 1 located on both sides in the construction surface. Part of the beam 2 on which the lower end of 4 is supported is integrated with the brace 3. FIG. 9 is a perspective view showing the relationship between the beam 2 (beam member 21) and the connecting member 3, and the brace and the middle column 4 shown in FIG.

  In FIG. 8, a part of the beam 2 on which the lower end portion of the middle pillar 4 is supported is integrated with the braces 3 and 3 as a connecting member 33 that connects the braces 3 and 3 located on both sides in the length direction. The beam 2 is absent in the installed section. In this case, structurally, the connecting member 33 serves as the beam 2 that receives the vertical load from the middle pillar 4 and transmits it to the brace 3. Formally, the beam 2 is composed of a beam 2 (beam members 21, 21) joined to the columns 1, 1 in the construction surface, and a connecting member 33 that is located in the middle of the beam 2 and is not continuous with the beam member 21. Become a shape.

  In the section where the connecting member 33 is installed, the beam 2 is discontinuous, and the end of the beam member 21 on the side of the connecting member 33 (middle column 4) is a free end. It is restrained by being connected to the small beam 7 in a direction orthogonal to the beam 2, and the load received by the beam 2 (beam member 21) flows through the small beam 7. A part of the load from the beam member 21 transmitted to the small beam 7 is transmitted from the small beam 7 to the middle column 4 as described later. In the example of FIG. 8, the brace 3 bears a tensile force in the axial direction, but since the acting direction of the load is the vertical direction, a bending moment acts on the cross section of the brace 3. H-shaped steel capable of transmitting a bending moment is used for the connecting member 33 that connects the three members.

  Since the connecting member 33 is located in the same plane as the braces 3 and 3, the plan view shows the axis of the braces 3 and 3 as shown in FIG. The cross section is located below the slab 8 as shown in FIG. In FIG. 8, since the small beam 7 orthogonal to the beam 2 is joined within the range of the middle column 4 below the slab 8, the middle column 4 is formed by the amount of the small beam 7 (height). The lower end is located below the slab 8. Accordingly, the center on the cross section of the connecting member 33 is positioned below the center on the cross section of the beam 2. FIG. 8- (a) shows a cross section taken along line zz of (b).

  For example, as shown in FIG. 8B, the end of the beam member 21 and the small beam 7 are joined to the end of the small beam 7 by welding or the like. Connected. In the drawing, the joining plate 23 is joined to an end plate (end plate) 72 joined (welded) to the end portion of the small beam 7 by a bolt or the like. The end plate 72 is projected from the beam member 21 side. It can also be used as the joining plate 23.

  The end of the small beam 7 on the side of the connecting member 33 protrudes from the lower end of the middle column 4 toward the small beam 7 as shown in FIG. In this state, they are connected to the facing beam 7 by being joined to a connecting plate 71 integrated with the middle pillar 4. By connecting the small beam 7 to the middle column 4 via the connection plate 71, the load on the slab 8 received by the small beam 7 is transmitted to the middle column 4 and transmitted from the middle column 4 to the brace 3 through the connection member 33. Is done.

  In the case of FIG. 8, the intermediate pillar 4 and the beam 2 (beam member 21), the small beam 7 and the slab 8 are integrated, and the brace 3 and the connecting member 33 behave as an integral unit. When this occurs, the brace 3 and the connecting member 33 move relative to the middle column 4 and the beam 2 and the small beam 7 and the slab 8 as indicated by a chain line in FIG. Since the slab 8 is integrated with the beam 2 (beam member 21), the slab 8 is formed with an opening 8a for allowing relative movement of the brace 3 passing therethrough.

  A part of the vertical load from the middle pillar 4 is transmitted to the connecting member 33 via a support member 41 such as a base plate joined to the lower end of the middle pillar 4 and a receiving member 34 joined to the upper surface of the connecting member 33. It is transmitted from the connecting member 33 to the brace 3. The other part of the vertical load is transmitted to the beam 7 joined to the lower end of the middle column 4 and the beam 2 (beam member 21) joined to the beam 7 and is transmitted in two directions through the beam 2 and the beam 7 Is transmitted to the first pillar 1.

  The connecting member 33 that supports the lower end portion of the middle pillar 4 is integrated with the brace 3 so that when a horizontal force is applied to the frame (when an interlayer deformation occurs in the erection layer 5), the brace 3 is connected to the bracing member 3. 33 and try to move relative to the beam 2 together. At this time, in order to allow the lower end portion of the middle column 4 and the connecting member 33 to freely move relative to each other, the lower end portion of the middle column 4 and the connecting member 33 are not actively obstructed from slipping between them. A bearing 9 for causing slippage is interposed. In FIG. 8, the support member 41 is joined to the lower end of the middle pillar 4, while the receiving member 34 for causing the support 9 to slide smoothly is joined to the upper surface of the connecting member 33 in the region where the support member 41 relatively moves. ing. The material (raw material) of the receiving member 34 is selectively determined depending on the type of the support 9. For example, when PTFE (tetrafluoroethylene resin) is used for the support 9, a stainless plate or the like is suitable.

  In the case where the support 9 smoothly slides between the support member 41 and the connecting member 33 (receiving member 34), in addition to a low friction material such as PTFE (tetrafluoroethylene resin), a rolling support and a sliding support are mainly used. Etc. are used. In order to control the sliding (frictional force), an elastic sliding bearing, a seismic isolation bearing, or the like is used, but without interposing the bearing 9, the material characteristics of the support member 41 and the connecting member 33, specifically, Both may be brought into direct contact using the coefficient of friction between the two.

  10 and 11, the upper end portion of the brace 3 is connected to the beam 2, the lower end portion is connected to the column 1 (column / beam joint portion) below the beam 2, and the layers higher than the layer where the brace 3 is installed. An example of a frame in the case where the middle pillar 4 is erected between the beams 2 and 2 extending over the area is shown. Here, the brace 3 is installed between the pillar 1 on the fourth floor and the beam 2 on the fifth floor (four layers), but the brace 3 is installed over a plurality of layers as in the example of FIGS. Sometimes. Further, in FIG. 10, the middle pillar 4 is constructed over the second to fourth layers (from the second-floor beam 2 to the fifth-floor beam 2), but it is sufficient that the middle pillar 4 is arranged only in the fourth layer. .

  When the upper end portion of the brace 3 is connected to the middle portion of the beam 2, the middle column 4 bears the vertical load on the beam 2 to which the lower end portion is connected as a tensile force, and the beam 2 to which the upper end portion is connected. In order to transmit, the middle pillar 4 in FIG. 10 transmits the vertical load supported by the beam 2 on at least the fourth floor to the beam 2 to which the upper end of the brace 3 is connected. In the example of FIG. 10, the middle pillar 4 is continuously constructed in the second and third layers (from the second floor beam 2 to the fourth floor beam 2) under the construction layer 5 (four layers). A part of the vertical load supported by the beam 2 from the second floor to the fourth floor may be transmitted to the beam 2 to which the upper end of the brace 3 is connected. In FIG. 10, the middle column 4 is arranged in parallel in the length direction of the beam 2, but there may be only one middle column 4 in the length direction of the beam 2 as in the example of FIG. 3. .

  FIG. 11- (a) shows a detailed example around the upper end of the brace 3 in FIG. 10, and FIG. 11 (b) shows a cross section taken along the line z-z in FIG. Here, since the middle columns 4 and 4 are juxtaposed between the beams 2 and 2, the heads (upper end portions) of the middle columns 4 and 4 so that both the middle columns 4 and 4 behave simultaneously when the interlayer is displaced. ) A connecting material 11 is installed between them. In this example, the head of the middle column 4 is connected to the beam 2 so as to be movable relative to the beam 2, and the brace 3 is connected to the beam 2 so as to be movable relative to the beam 2. The upper end of 3 is connected to the head of the middle post 4.

  The upper end of the brace 3 only needs to be able to move relative to the beam 2 on that side. However, in the example of FIG. 10, the upper end of the brace 3 is connected to the middle column 4, so What is necessary is just to move relatively. In the drawing, the plate 3a integrated with the upper end portion of the brace 3 is pin-bonded to the gusset plate 12 projecting from the middle column 4, but the connection method to the middle column 4 at the upper end portion of the brace 3 is arbitrary, It may be rigidly joined.

  The vertical load transmitted to the beam 2 to which the upper end portion of the brace 3 is connected through the middle column 4 is borne by the brace 3 connected to the beam 2 as a compressive force, and is transmitted to the column 1 to which the lower end portion is connected. . For this reason, the upper end (head) of the middle column 4 only needs to be connected to the beam 2 to which the brace 3 is connected. In FIG. For this purpose, a sliding member 10 that holds the lower flange of the beam 2 is joined (fixed) to the upper end portion of the middle column 4, and the upper end portion of the brace 3 is connected to the sliding member 10. The sliding member 10 is connected to each one of the middle pillars 4, and when a plurality of middle pillars 4, 4 are arranged in parallel as shown in FIG. 10, the sliding member 10 is connected to a connecting material 11 that connects all the middle pillars 4. Sometimes.

  The sliding member 10 has a groove-like cross-sectional shape surrounding the lower flange of the beam 2 in order to connect the head of the middle column 4 to the beam 2 so as to be relatively movable in the length direction, and grips the lower flange. In this state, it is joined to the head of the middle pillar 4. Specifically, as shown in FIG. 11- (b), for example, the sliding member 10 connects an upper plate 10a facing the upper surface of the lower flange of the beam 2, a lower plate 10b facing the lower surface, and both plates 10a and 10b. The side plate 10c faces the side surface of the lower flange.

  In order to make the sliding member 10 movable relative to the beam 2, the above-described support 9 is interposed between the sliding member 10 and the beam 2. Depending on the purpose, the bearing 9 may be a low friction material, a rolling bearing, a sliding bearing, an elastic sliding bearing, a seismic isolation bearing, or the like. The support 9 is interposed between at least one of the lower plate 10b and the lower flange of the sliding member 10 and between the upper plate 10a and the lower flange, as shown in FIG. 11- (b).

  In the example of FIG. 10, the upper end portion of the middle column 4 is connected to the beam 2 so as to be relatively movable with respect to the beam 2, so that the middle column 4 relatively moves without following the beam 2 at the time of interlayer displacement. Since the middle pillar 4 does not resist horizontal force as an earthquake resistant element, the construction of the bracing layer 3 and the middle pillar 4 does not increase the rigidity of the construction layer 5.

  FIGS. 12A and 12B show an example in which the two lower layers of the erection layer 5 in FIG. 10 are column-free spaces. (A) is a case where the two middle pillars 4 constructed on the construction layer 5 are coupled by the connecting material 11 as in FIG. 10, and the brace 3 is connected to the head of each coupled middle pillar 4. (B) is a case where the two middle pillars 4 are made independent, and the sliding member 10 and the two braces 3 and 3 are connected to the heads of the respective middle pillars 4. In either case, since the middle column 4 is relatively movable with respect to the beam 2, the brace 3 and the middle column 4 exhibit the same behavior when the interlayer is displaced.

(A) is an elevation view showing an example of a frame in which braces and middle pillars are arranged over two layers near the upper layer in a high-rise frame, and (b) is a frame when the braces and middle columns of the present invention are arranged. FIG. 5C is an elevation view showing the deformation state of the frame when the beam side end of the brace is joined (connected) to the beam. It is an elevational view showing an example of a low-rise (three-layer) frame in which a multi-span (three-span) space is secured under the erection layer in which braces and middle pillars are arranged. It is the elevation which showed the example of the frame of the piloti form whose bottom layer is the pillarless space (multi span) which has the height for two layers. It is the perspective view which showed the relationship between the brace and the beam of the layer (intermediate floor) through which it passes, and (a) is a case where a beam is composed of an end beam, an intermediate beam, and a parallel connection beam. ) Is a case where a brace is composed of two parallel brace members. (A) is an elevational view showing a six-layer frame in which only the middle pillar is installed between adjacent beams and the brace of the present invention is not installed, and (b) is the same number of layers as (a), 3 It is the elevation which showed the frame where the brace of this invention is constructed between the beam of the floor to the beam of the 5th floor. (A) is an elevation view showing an example of a conventional frame in which the end of the brace on the beam side is connected to the beam (pin connection) and the end of the middle column is connected to the beam (pin connection); ) Is an elevation view showing a deformed state when the frame shown in (a) receives a horizontal force. (A) is an elevation view showing the case where the lower end of the brace is connected to the beam so as to be relatively movable in the same frame as in FIG. 6 (a), and (b) shows the deformation state of the frame shown in (a). FIG. (A) is an elevation view showing an example of connection between a beam of an end beam and a brace beam when the beam is composed of an intermediate beam that is joined to both ends of the end beam in the longitudinal direction. (B) is sectional drawing of the yy line | wire of (a), (c) is xx sectional view taken on the line of (a). FIG. 9 is a perspective view of FIG. It is the elevation which showed the example of a frame in case the upper end part of a brace is connected to a beam, and a lower end part is connected to a lower layer pillar. (A) is the elevation which showed the detail of the junction part of the brace in FIG. 10, and (b) is the zz sectional view taken on the line of (a). (A), (b) is the elevation which showed the example of a structure at the time of making the lower layer of the construction layer in FIG. 10 into the column-free space.

Explanation of symbols

1 ... pillar, 2 ... beam,
21 …… Beam member, 22 …… Splice plate, 23 …… Joint plate,
3 ... brace, 31 ... brace material, 32 ... splice plate, 33 ... connecting member, 34 ... receiving member, 3a ... plate,
4 ... middle pillar, 41 ... support member,
5 …… Establishment layer,
6 ... Gusset plate, 7 ... Small beam, 71 ... Connecting plate,
8 ... slab, 8a ... opening, 9 ... support,
10 ... sliding member, 10a ... upper plate, 10b ... lower plate, 10c ... side plate,
11 ... Tie, 12 ... Gusset plate.

Claims (5)

In a multi-layered structure consisting of columns and beams , braces are installed in the section from a column of an arbitrary layer to a beam below it, and at least the upper floor beam and lower floor of the layer where this brace is installed A middle pillar is erected between the side beams ,
The upper end of the brace is connected to the column, or the junction between the column and the beam, or the vicinity thereof, and the lower end of the brace is the intermediate portion in the longitudinal direction of the beam on the lower floor side of the section where the brace is installed. And connected to a state of bearing a vertical load received by the beam on the lower floor side through the middle column, and connected to the beam in a relatively movable manner in the length direction of the beam,
The lower end of the middle pillar is connected to the beam on the lower floor to which the lower end of the brace is connected, and the middle pillar bears a vertical load from the upper floor beam to which the upper end is connected as a compressive force. And
The suspension structure frame according to claim 1, wherein the brace is in a state in which a vertical load transmitted through the middle column is applied as a tensile force to the beam on the lower floor side to which the lower end portion is connected . In a multi-layered structure consisting of columns and beams , braces are installed in the section from a beam of any layer to a column below it, and at least the beam on the upper floor and the lower floor of the layer where this brace is installed A middle pillar is erected between the side beams ,
The upper end of the brace is connected to a middle portion in the longitudinal direction of the beam on the upper floor side of the section where the brace is installed, and is relatively movable in the longitudinal direction of the beam, and the upper end through the middle column. It is connected to a state that bears the vertical load received by the beam on the floor side, and the lower end of the brace is connected to the column, or the junction between the column and the beam, or the vicinity thereof,
The upper end of the middle pillar is connected to the upper floor beam to which the upper end of the brace is connected, and the middle pillar bears a vertical load from the lower floor beam to which the lower end is connected as a tensile force. And
The suspension structure frame according to claim 1, wherein the brace is in a state in which a vertical load transmitted through the middle column to the beam on the upper floor side to which an upper end portion of the brace is connected is applied as a compressive force . The suspension structure type frame according to claim 1 or 2 , wherein the brace is constructed over a plurality of layers and is not connected to a beam of a layer through which the brace passes. The end of the middle column located near the end of the brace connected to the beam so as to be relatively movable is connected to the beam on the side so as to be relatively movable in the length direction. The suspension structure type frame according to any one of claims 1 to 3 . The end of the brace and a beam to which the brace is connected are connected via a support that allows relative movement between the two, and the brace is in a state that does not bear a horizontal load when the interlayer is displaced. The suspension structure type frame according to any one of claims 1 to 4 .

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