JP6848932B2 - Seismic isolation damper and seismic isolation structure using the seismic isolation damper - Google Patents

Description

The present invention relates to a seismic isolation damper provided in a seismic isolation layer in which a lower structure and an upper structure of a building have a predetermined interval to absorb seismic energy, and a seismic isolation structure using the seismic isolation damper.

Seismic isolation structures are becoming more widespread, especially in skyscrapers, and seismic isolation dampers installed in the seismic isolation layer are being developed accordingly.
A steel damper is an example of this seismic isolation damper. The steel damper is a damper that utilizes the plasticization of steel, and is characterized by yielding the steel by applying a load during an earthquake to the steel to cause bending and twisting, and absorbing seismic energy as strain energy of the steel. It is supposed to be.

As an example of such a steel damper, for example, in Patent Document 1, "a mounting plate mounted on a lower structure, a plurality of rods erected on the mounting plate, and mounted on each rod, the mounting plate is described. A damper consisting of a support plate that is in a positional relationship with the support plate, a guide portion that stands on the support plate, and a holding portion that is attached to the lower part of the upper building and holds the guide portion movably. " See) is disclosed.

Further, Patent Document 2 states, "A seismic isolation damper provided between two members facing each other and suppressing relative vibration in a direction along the facing surfaces of these two members. A base end portion of a rod-shaped steel material whose tip end extends toward the other member is fixed to one of the two members, and the tip end portion of the steel material is located at a position facing the tip end portion of the steel material on the other of the two members. An annular gap mechanism that includes the tip of the steel material is fixed with a gap between the periphery and the tip of the steel material, and when the relative displacement of the two members reaches a predetermined amount, the tip of the steel material and the gap mechanism A seismic isolation damper characterized in that the inner peripheral portion of the steel is brought into contact with the steel. ”Is disclosed.

Japanese Unexamined Patent Publication No. 62-288270 Japanese Unexamined Patent Publication No. 62-63775

Since the seismic isolation layer undergoes a large interlayer displacement during a large earthquake, it is necessary to increase the deformation performance of the damper as compared with the damper inserted into the frame of a normal building. Further, since the direction of vibration of the building is not limited to one direction, a non-directional damper that exhibits the same damping performance in any direction is desired. Furthermore, since seismic waves have not only vibration in the horizontal direction but also vibration components in the vertical direction, the axial force introduced into the damper does not lead to deterioration of the damper performance when the seismic isolation layer is displaced in the vertical direction. Is also needed. Furthermore, depending on the seismic isolation layer, it may not be possible to increase the height of the damper installation, so a damper that can exhibit large deformation performance even in a narrow space is desirable.

As described above, performances such as deformation performance capable of following a large interlayer displacement, non-directionality having no directional damping performance, a mechanism capable of eliminating the influence of axial force, and a space-saving mechanism that can be installed in a narrow space are required.
In this respect, the one disclosed in Patent Document 1 is considered to have the performance of non-directionality and elimination of the influence of axial force. However, in Patent Document 1, it is necessary to provide a guide portion and a holding portion as a mechanism for eliminating the influence of the axial force between the support plate mounted on each rod body and the upper building, which saves space. Does not meet the requirement. Moreover, since the steel material is composed of continuous rods, large deformation performance cannot be expected.

Further, the one disclosed in Patent Document 2 is considered to have non-directional performance, but when the relative displacement reaches a predetermined amount, the tip portion of the steel material and the inner peripheral portion of the gap mechanism come into contact with each other. Since it is a function, if the gap is small, it will not function up to a large relative displacement, and conversely, if the gap is large, it will not function for a small relative displacement, so it lacks the ability to function from a small earthquake to a large earthquake. Further, since the steel bars provided between the members facing each other are coaxially located, an interlayer space corresponding to the total length of the upper steel bar and the lower steel bar is required, which cannot be said to be space saving.

The present invention has been made to solve such a problem, and has deformation performance capable of following a large interlayer displacement, non-directionality having no directionality in damping performance, a mechanism capable of eliminating the influence of axial force, and installation in a narrow space. The purpose is to provide a seismic isolation damper that has all the performance of a space-saving mechanism that can be achieved. Another object of the present invention is to provide a seismic isolation structure using the seismic isolation damper.

(1) The seismic isolation damper according to the present invention is provided in a seismic isolation layer in which the lower structure and the upper structure have a predetermined interval.
A lower steel bar whose lower end is fixed to the lower structure and extends toward the superstructure, and a lower steel bar whose upper end is fixed to the superstructure and which is fixed to the superstructure and extends toward the superstructure and the tip of the lower steel bar. It has a perforated plate having an insertion hole through which at least one of the lower steel bar and / or the upper steel bar can be inserted into the upper steel bar extending below.
With the tip of the lower steel bar and / or the upper steel bar inserted into the insertion hole of the perforated plate, the perforated plate is arranged so as to extend over the lower steel bar and the upper steel bar.
When the lower structure and the upper structure are displaced between layers during an earthquake, the lower steel bar and the upper steel bar are subjected to a force in the direction orthogonal to the axis to the lower steel bar and the upper steel bar. It is characterized in that the steel bar is bent and deformed so as to absorb energy.

(2) Further, in the one described in (1) above, the perforated plate is characterized in that it is fixed to the tip of either the lower steel bar or the upper steel bar.

(3) Further, in the above-mentioned item (2), the tip portion of the lower steel bar or the upper steel bar, which has a larger diameter than the hole diameter of the perforated plate, is larger than the hole diameter of the perforated plate on the side to which the perforated plate is not fixed. It is characterized by providing a retaining member.

(4) Further, in the one described in (1) above, at least the upper steel bar is composed of a plurality of steel bars.
The perforated plate has a hole through which the tip of the lower steel bar and the tip of the upper steel can be inserted, and a retaining member is provided at the tip of the upper steel to prevent the perforated plate from falling off. It is characterized by that.

(5) The above-described item (4) is characterized in that a retaining member having a diameter larger than the hole diameter of the perforated plate is provided at the tip of the lower steel bar.

(6) Further, in the one described in (1) above, the perforated plate is fixed to the tip of the lower steel bar and has a hole through which the tip of the upper steel bar can be inserted. It is characterized by comprising a plate and an upper perforated plate which is fixed to the tip of the upper bar and has a hole through which the tip of the lower bar can be inserted.

(7) Further, in any of the above (1) to (6), the lower steel bar and / or the upper steel bar is inside the lower structure and / or the superstructure, respectively. It is characterized in that the end of the reinforced reinforcing bar is extended.

(8) The seismic isolation structure according to the present invention is a seismic isolation structure provided in a seismic isolation layer in which a lower structure and an upper structure have a predetermined interval.
The seismic isolation damper has the seismic isolation damper and the isolator according to any one of (1) to (7) above, and the seismic isolation damper surrounds the isolator installed between the lower structure and the upper structure. It is characterized by being installed.

(9) Further, the seismic isolation structure according to the present invention is a seismic isolation structure provided in a seismic isolation layer in which the lower structure and the upper structure have a predetermined interval.
It has the seismic isolation damper and the isolator according to any one of (1) to (7) above, and is a part of a plurality of sets of the lower structure and the upper structure provided in the seismic isolation layer. Is characterized in that only the seismic isolation damper is provided and only the isolator is provided in the other set.

The seismic isolation damper according to the present invention is provided in a seismic isolation layer in which a lower structure and an upper structure have a predetermined interval, and a lower end thereof is fixed to the lower structure to the upper structure. A lower steel bar extending toward the lower side, an upper steel bar having an upper end fixed to the superstructure and extending toward the lower structure and below the tip of the lower steel bar, and the lower side. The steel bar and / or at least one of the upper steel bars has a perforated plate having an insertion hole through which the steel bar and / or the upper steel bar can be inserted.
With the tip of the lower steel bar and / or the upper steel bar inserted into the insertion hole of the perforated plate, the perforated plate is arranged so as to extend over the lower steel bar and the upper steel bar.
When the lower structure and the upper structure are interleaved during an earthquake, the lower steel bar and the upper steel bar are subjected to a force in the direction perpendicular to the axis to the lower steel bar and the upper steel bar. By giving bending deformation to the steel bar to absorb energy, deformation performance that can follow large interlayer displacement, non-directionality with no directionality in damping performance, mechanism that can eliminate the influence of axial force, installation in a narrow space A seismic isolation damper with all the performance of a space-saving mechanism that can be realized can be realized.

It is explanatory drawing of the seismic isolation damper of Embodiment 1. It is explanatory drawing of the perforated plate of the seismic isolation damper of Embodiment 1. FIG. It is explanatory drawing explaining the operation of the seismic isolation damper of Embodiment 1 (the 1). It is explanatory drawing of the bending moment acting on the seismic isolation damper of Embodiment 1. FIG. It is explanatory drawing explaining the operation of the seismic isolation damper of Embodiment 1 (the 2). It is a graph which shows the relationship between the load acting on the seismic isolation damper of Embodiment 1 and the amount of displacement between layers. It is explanatory drawing of another aspect of the seismic isolation damper of Embodiment 1. FIG. It is explanatory drawing of the seismic isolation damper of Embodiment 2. It is the arrow AA figure of FIG. It is explanatory drawing explaining the operation of the seismic isolation damper of Embodiment 2. It is explanatory drawing of the seismic isolation damper of Embodiment 3. It is explanatory drawing explaining the operation of the seismic isolation damper of Embodiment 3. It is explanatory drawing of the bending moment acting on the seismic isolation damper of Embodiment 3. It is explanatory drawing of the seismic isolation structure which combined the seismic isolation damper and the isolator (the 1). FIG. 14 is an arrow view BB of FIG. It is explanatory drawing of the seismic isolation structure which combined the seismic isolation damper and the isolator (the 2). FIG. 16 is an arrow CC diagram of FIG. It is explanatory drawing of the seismic isolation structure which combined the seismic isolation damper and the isolator (the 3).

[Embodiment 1]
The seismic isolation damper 1 according to the present embodiment is provided on the seismic isolation layer 7 in which the lower structure 3 and the upper structure 5 have a predetermined interval, and the lower end is fixed to the lower structure 3. , The lower steel bar 9 extending toward the upper structure 5, and the upper end fixed to the upper structure 5 and extending toward the lower structure 3 and below the tip of the lower steel bar 9. A perforated plate 15 having an insertion hole 13 through which the lower steel bar 9 can be inserted, and a perforated plate 15 fixed to the lower end of the upper steel bar 11 with the upper end of the lower steel bar 9 inserted through the insertion hole. have.
Hereinafter, each configuration will be described in detail.

<Substructure, superstructure>
The lower structure 3 is, for example, the lower side of a pillar provided between the lower slab 2 and the upper slab 4 of the building, and the upper structure 5 is also provided between the lower slab 2 and the upper slab 4 of the building. It is the upper side of the pillar.
The space between the lower slab 2 and the upper slab 4 where the lower structure 3 and the upper structure 5 are present is the seismic isolation layer 7.

<Lower steel bar>
The lower steel bar 9 is made of a steel material, has a lower end fixed to the lower structure 3, and extends toward the upper structure 5.
As a method of fixing the lower steel bar 9, a method of welding or bolting to an end plate fixed to concrete with anchor bolts, or a method of directly embedding in concrete can be considered. The former is close to the rigid end and the strain at the end increases, while the latter reduces the rigidity due to the deformation of the concrete, but it is thought that the plasticized region expands and the deformation performance improves. However, the difference between the two in the load-deformation relationship is considered to be small.

As shown in FIG. 1, the tip end side of the lower steel bar 9 is inserted into the insertion hole 13 of the perforated plate 15 and extends upward by a predetermined length from the perforated plate 15. The extension length is set so that the lower steel bar 9 does not come out from the insertion hole 13 of the perforated plate 15 when the seismic isolation layer is maximally displaced. Specifically, the required extension length is obtained by calculating the deflection generated in the lower steel bar 9 at the time of the maximum displacement of the seismic isolation layer 7.
Further, in the present embodiment, as described later, a nut 17 is attached to the tip of the lower steel bar 9 to prevent it from coming off. In this case, the nut 17 is a perforated plate 15 when an interlayer displacement occurs. The extension length is set so that the lower steel bar 9 and the upper steel bar 11 do not break when an axial force is generated in contact with the steel bar 9.

The cross section of the lower steel bar 9 has a circular shape, and is movable along the axis in the insertion hole 13 of the perforated plate 15 (see FIG. 2).
A screw portion is provided at the tip of the lower steel bar 9, and a nut 17 as a retaining member for preventing the lower steel 9 from coming out of the insertion hole 13 is attached. The position where the nut 17 is attached is not limited to the tip of the lower steel bar 9, and may be appropriately set depending on how much the inter-story displacement amount is desired to exert the axial force.
As the steel material used for the lower steel bar 9, steel grades ranging from ordinary steel to low yield point steel can be used, and a steel grade capable of exhibiting the required deformation performance according to the assumed clearance of the seismic isolation layer 7 should be selected. Just do it.

<Upper steel bar>
The upper steel bar 11 is made of a steel material, the upper end of which is fixed to the upper structure 5, and extends toward the lower structure 3 and below the tip of the lower steel bar 9. By extending the tip of the upper steel bar 11 below the tip of the lower steel bar 9, a portion where the upper steel bar 11 and the tip of the lower steel bar 9 overlap when viewed from the horizontal direction is formed.
A screw portion is provided at the tip of the upper steel bar 11, and the perforated plate 15 is fixed by using this screw portion.
As the material of the upper steel bar 11, the steel grades from ordinary steel to low yield point steel can be used as in the lower steel bar 9, and the required deformation performance is exhibited according to the assumed clearance of the seismic isolation layer 7. You can select the steel type that can be used.

<Perforated plate>
As shown in FIG. 2, the perforated plate 15 is made of a rectangular plate material, and is provided with two insertion holes 13 through which the upper steel bar 11 and the lower steel bar 9 can be inserted. The tip of the upper steel bar 11 is inserted into one of the insertion holes 13, and the perforated plate 15 is fixed by being sandwiched by nuts 17 from above and below the perforated plate 15.
A lower steel bar 9 is inserted into the other insertion hole 13 of the perforated plate 15, and the upper portion of the lower steel bar 9 extends above the perforated plate 15.

The operation of the seismic isolation damper 1 configured as described above will be described with reference to FIGS. 3 to 6.
When the seismic isolation layer 7 is displaced between layers due to an earthquake, the upper steel bar 11 and the lower steel bar 9 move relative to each other in the horizontal direction, and the insertion hole 13 and the lower steel bar of the perforated plate 15 fixed to the upper steel bar 11 move. The load is transmitted by contacting with 9. At this time, since the perforated plate 15 moves in the axial direction with respect to the lower steel bar 9, the load is transmitted to the upper steel bar 11 and the lower steel 9 with the position of the perforated plate 15 as a pin joint. As shown in FIG. 3, the upper steel bar 11 and the lower steel bar 9 are bent and deformed to absorb energy. By arranging the position of the perforated plate 15 in the center of the layers of the seismic isolation layer 7, the seismic isolation damper 1 (upper side steel bar 11 and lower side steel bar 9) is vertically inverted symmetrical as shown in FIG. The bending moment distribution can be applied to the seismic isolation damper 1. As a result, the upper steel bar 11 and the lower steel bar 9 are plasticized substantially evenly. At this time, since there is a gap between the perforated plate 15 and the peripheral surface of the lower steel bar 9 and the nut 17 at the tip is separated, axial force is applied to the upper steel bar 11 and the lower steel bar 9. Absent. On the other hand, since the length of the steel bar that functions as the seismic isolation damper corresponds to the length obtained by adding the lengths of the upper steel bar 11 and the lower steel bar 9, the overlap between the upper steel bar 11 and the lower steel bar 9 in the side view. Only the height of the seismic isolation damper is longer than the installation height, and a large deformation performance can be obtained. Moreover, unlike Patent Document 2, it can function as a seismic isolation damper at the time of a small-scale earthquake, that is, from a state where the interlayer displacement is small.

When the inter-story displacement becomes larger, as shown in FIG. 5, the perforated plate 15 comes into contact with the nut 17, and a tensile axial force acts on the upper steel bar 11 and the lower steel bar 9, and the rigidity of the seismic isolation damper becomes increased. High damping force can be exhibited by rising.
The relationship between the load acting on the seismic isolation damper 1 and the amount of inter-story displacement during an earthquake is as shown in FIG.

As described above, in the seismic isolation damper 1 of the present implementation, since the entire lengths of both the upper steel bar 11 and the lower steel bar 9 can be used, the seismic isolation damper 1 has a deformation performance capable of following a large interlayer displacement, and the upper steel bar 11 and the lower portion. Since there is a portion that overlaps the tip of the side steel bar 9, it is also a space-saving mechanism that can be installed in a narrow space. Since the upper steel bar 11 and the lower steel bar 9 can move in any direction when the interlayer displacement occurs, they have a non-directional property having no directionality in the damping direction. Further, since the perforated plate 15 moves in the axial direction of the lower steel bar 9 when the interlayer displacement occurs, it is also a mechanism that can eliminate the influence of the axial force until the interlayer displacement becomes a certain magnitude. Further, by providing the nut 17 at the tip of the lower steel bar 9, when the interlayer displacement becomes equal to or larger than a predetermined size, the perforated plate 15 comes into contact with the nut 17 as described above, and the upper steel bar 11 A tensile axial force acts on the lower steel bar 9 and the rigidity of the seismic isolation damper is increased, so that a high damping force can be exhibited.

In the above description, the upper steel bar 11 and the lower steel bar 9 are separately installed in the upper structure 5 and the lower structure 3, respectively. However, as shown in FIG. 7, the upper steel bar 11 and the lower steel bar 9 are installed separately. The side steel bars 9 may be those in which the ends of the reinforcing bars 19 arranged inside the superstructure 5 and the lower structure 3 are extended, respectively. With such a structure, the construction is completed simply by connecting the extended reinforcing bars 19 with the perforated plate 15 after placing the reinforced concrete, so that the number of members can be reduced and the construction can be shortened. ..

Further, in the above description, the perforated plate 15 is fixed to the tip of the upper steel bar 11, but the perforated plate 15 may be fixed to the tip of the lower steel bar 9.

[Embodiment 2]
In the first embodiment, the perforated plate 15 is fixed to the tip of the upper steel bar 11, but it is essential that the perforated plate 15 of the present invention is fixed to the upper steel bar 11 or the lower steel bar 9. Instead, the perforated plate 15 may be arranged so as to extend between the tips of both the upper steel bar 11 and the lower steel bar 9. The seismic isolation damper of such an aspect will be described with reference to FIGS. 8 to 10. In FIGS. 8 to 10, the same or corresponding parts as those in FIG. 1 are designated by the same reference numerals.
In the seismic isolation damper 21 according to the present embodiment, as shown in FIGS. 8 and 9, a plurality of lower side steel bars 9 and a plurality of upper side steel bars 11 are arranged in a circular shape, and the lower side steel bars 9 and the seismic isolation damper 21 A nut 17 for preventing the pull-out is provided at the tip of the upper steel bar 11. The perforated plate 15 has an annular shape, and is provided with a number of insertion holes 13 through which both the lower steel bar 9 and the upper steel bar 11 can be inserted. Therefore, the perforated plate 15 can move relative to both the lower steel bar 9 and the upper steel bar 11 between the nut 17 at the tip of the lower steel bar 9 and the nut 17 at the tip of the upper steel bar 11. It has become.

When the seismic isolation layer 7 is displaced between layers, as shown in FIG. 10, a load acts on the lower steel bar 9 and the upper steel bar 11 via the perforated plate 15, and the lower steel bar 9 and the upper steel bar 11 are subjected to a load. Absorbs energy by surrendering. At this time, since the perforated plate 15 moves relative to both the lower steel bar 9 and the upper steel bar 11, when the perforated plate 15 is not in contact with the upper and lower nuts 17, the lower steel bar 9 and the upper steel bar 11 and the perforated plate 15 move relative to each other. No axial force acts on the upper steel bar 11.

In the above description, an example in which a plurality of lower steel bars 9 and upper steel bars 11 are arranged in a circular shape is shown, but the arrangement of the plurality of lower steel bars 9 and upper steel bars 11 is circular. In this case, the perforated plate 15 may be arranged in a polygonal shape such as an octagonal shape. In this case, the shape of the perforated plate 15 may be a polygonal annular plate. However, since the perforated plate 15 of the present embodiment is not fixed and is held by being placed on the nut 17 at the tip of the upper steel bar 11, the arrangement of the upper steel bar 11 is placed. It is preferable that the perforated plate 15 is arranged so as to be stably placed.

In a mode in which the perforated plate 15 is not fixed to the upper steel bar 11 or the lower steel bar 9, the perforated plate 15 moves relative to both the upper structure 5 and the lower structure 3 when an interlayer displacement occurs. The load may be transmitted to both the upper steel bar 11 and the lower steel bar 9, and the load may be suspended from the upper structure 5 with a wire or the like.

Regarding the seismic isolation dampers 1 and 21 described in the above-described first and second embodiments, the axial force is applied to the steel bars (upper steel bar 11, lower steel bar 9) until the perforated plate 15 is restrained by the nut 17. since but does not act, the seismic isolation layer shearing force during damper yield (damping force) Q _d is assuming moment distribution of seismic isolation damper 1, 21 is inverted symmetrically, in a very simple equation shown below expressed.
Q _d = σ _y・ Z _p・ n / (h / 2)
However, Z _p : Plastic cross-sectional coefficient of bar steel (upper bar steel, lower bar steel) σ _y : Yield strength of bar steel (upper bar steel, lower bar steel) h: Seismic isolation damper installation height (superstructure and lower structure) Body gap height)
n: Number of seismic isolation dampers (one for the upper steel bar and the lower steel bar connected by a perforated plate)
Since the seismic isolation dampers 1 and 21 of the first and second embodiments have no directionality, the seismic isolation damper shape having the required performance can be easily designed by using the above equation.

[Embodiment 3]
The seismic isolation damper 23 of the third embodiment will be described with reference to FIGS. 11 to 13. In FIGS. 11 to 13, the same parts as those in FIGS. 1 to 10 and the corresponding parts showing the first and second embodiments are designated by the same reference numerals.
The arrangement of the upper steel bar 11 and the lower steel bar 9 of the present embodiment is the same as that of the second embodiment. However, in the second embodiment, the perforated plate 15 is one and is not fixed to either the upper steel bar 11 or the lower steel bar 9, whereas in the present embodiment, the upper steel bar 11 It is composed of two annular plates, an upper perforated plate 25 fixed to the tip and a lower perforated plate 27 fixed to the tip of the lower steel bar 9.

In the present embodiment, when an interlayer displacement occurs, as shown in FIG. 12, the upper perforated plate 25 moves relative to the lower steel bar 9, and the lower perforated plate 27 moves relative to the lower steel bar 9. It moves relative to 11. At this time, the upper perforated plate 25 is fixed to the tip of the upper steel bar 11, and the lower perforated plate 27 is fixed to the tip of the lower steel bar 9. Therefore, in the state shown in FIG. 12, the upper side is used. The load is transmitted not only to the base end side of the steel bar 11 and the lower steel bar 9, but also to the tip side, resulting in a bending moment distribution as shown in FIG. 13, and the base end side and the tip side of the upper steel bar 11 and the lower steel bar 9 It is plasticized and energy is absorbed.

According to the seismic isolation damper 23 of the present embodiment, since the upper steel bar 11 and the lower steel bar 9 are plasticized at the base end side and the tip end side, it can be said that the amount of energy absorbed is large and the energy capacity is high. ..

The seismic isolation dampers 1, 21, and 23 described in the first to third embodiments can be used alone, but can be used in combination with an isolator to form a seismic isolation structure. In particular, the seismic isolation damper of the present invention is said to have deformation performance that can follow a large interlayer displacement, non-directionality that has no directionality in damping performance, a mechanism that can eliminate the influence of axial force, and a space-saving mechanism that can be installed in a narrow space. Since it has all the performance, it is suitable for forming a seismic isolation structure in combination with an isolator.

As such a seismic isolation structure 29, for example, as shown in FIGS. 14 to 17, it has seismic isolation dampers 21, 1 and an isolator 31, and is installed between the lower structure 3 and the upper structure 5. Examples include those in which seismic isolation dampers 21 and 1 are installed so as to surround the isolator 31. More specifically, what is shown in FIGS. 14 and 15 is an isolator in the ring of the perforated plate 15 in the seismic isolation damper 21 using the annular perforated plate 15 described in the second embodiment. 31 is installed.
Further, in FIGS. 16 and 17, four seismic isolation dampers 1 using the perforated plate 15 made of the rectangular plate material described in the first embodiment are placed around the isolator 31 at equal intervals. It was installed.

Further, as another example of the seismic isolation structure 29 in which the seismic isolation damper 1 and the isolator 31 are combined, as shown in FIG. 18, a plurality of the lower structure 3 and the upper structure 5 provided in the seismic isolation layer 7 Some of the groups are provided with only the seismic isolation damper 1, and the other groups are provided with only the isolator 31.

1 Seismic isolation damper (Embodiment 1)
2 Lower slab 3 Lower structure 4 Upper slab 5 Upper structure 7 Seismic isolation layer 9 Lower side steel bar 11 Upper side steel bar 13 Insertion hole 15 Perforated plate 17 Nut 19 Reinforcing bar 21 Seismic isolation damper (Embodiment 2)
23 Seismic isolation damper (Embodiment 3)
25 Upper perforated plate 27 Lower perforated plate 29 Seismic isolation structure 31 Isolator

Claims (9)

A seismic isolation damper provided in a seismic isolation layer in which the lower structure and the upper structure have a predetermined interval.
A lower steel bar whose lower end is fixed to the lower structure and extends toward the superstructure, and a lower steel bar whose upper end is fixed to the superstructure and which is fixed to the superstructure and extends toward the superstructure and the tip of the lower steel bar. an upper side bars extending downwardly than, have a perforated plate in which the lower side bar steel having an insertion possible insertion hole,
The perforated plate is fixed to the tip of the upper steel bar, the tip of the lower steel bar is inserted into the insertion hole of the perforated plate, and the perforated plate is attached to the lower steel bar and the upper steel bar. Arrange so that it spans
When the lower structure and the upper structure are interleaved during an earthquake, the axis orthogonal to the lower steel bar and the upper steel bar from the perforated plate to the lower steel bar and the upper steel bar. A seismic isolation damper characterized in that the lower steel bar and the upper steel bar are bent and deformed by applying a directional force to absorb seismic energy. A seismic isolation damper provided in a seismic isolation layer in which the lower structure and the upper structure have a predetermined interval.
A lower steel bar whose lower end is fixed to the lower structure and extends toward the superstructure, and a lower steel bar whose upper end is fixed to the superstructure and which is fixed to the superstructure and extends toward the superstructure and the tip of the lower steel bar. an upper side bars extending downwardly than, have a perforated plate, wherein the upper side bar steel having an insertion possible insertion hole,
The perforated plate is fixed to the tip of the lower steel bar, the tip of the upper steel bar is inserted into the insertion hole of the perforated plate, and the perforated plate is attached to the lower steel bar and the upper steel bar. Arrange so that it spans
When the lower structure and the upper structure are interleaved during an earthquake, the axis orthogonal to the lower steel bar and the upper steel bar from the perforated plate to the lower steel bar and the upper steel bar. A seismic isolation damper characterized in that the lower steel bar and the upper steel bar are bent and deformed by applying a directional force to absorb seismic energy. And wherein one of the lower side steel bar or-edge of the upper side bars, provided with retaining members having a diameter larger than the diameter of the perforated plate insertion hole toward said perforated plate is not fixed The seismic isolation damper according to claim 1 or 2. A seismic isolation damper provided in a seismic isolation layer in which the lower structure and the upper structure have a predetermined interval.
A lower steel bar whose lower end is fixed to the lower structure and extends toward the superstructure, and a lower steel bar whose upper end is fixed to the superstructure and which is fixed to the superstructure and extends toward the superstructure and the tip of the lower steel bar. It has a plurality of upper steel bars extending below, and a perforated plate having insertion holes through which the lower steel bars and the upper steel bars can be inserted.
The tip portions of the upper steel bar and the lower steel bar are inserted into the insertion holes of the perforated plate, and the perforated plate is arranged so as to extend over the lower steel bar and the upper steel bar, and the upper side. A retaining member is provided at the tip of the steel bar to prevent the perforated plate from falling off.
When the lower structure and the upper structure are interleaved during an earthquake, the axis orthogonal to the lower steel bar and the upper steel bar from the perforated plate to the lower steel bar and the upper steel bar. A seismic isolation damper characterized in that the lower steel bar and the upper steel bar are bent and deformed by applying a directional force to absorb seismic energy. Seismic isolation damper according to claim 4, characterized in that a retaining member having a diameter larger than the diameter of the perforated plate insertion holes of the previous end of the lower side bars. A seismic isolation damper provided in a seismic isolation layer in which the lower structure and the upper structure have a predetermined interval.
A lower steel bar whose lower end is fixed to the lower structure and extends toward the superstructure, and a lower steel bar whose upper end is fixed to the superstructure and which is fixed to the superstructure and extends toward the superstructure and the tip of the lower steel bar. An upper bar that extends below the lower bar, a lower perforated plate that is fixed to the tip of the lower bar and has an insertion hole through which the tip of the upper bar can be inserted, and the upper bar. It has an upper perforated plate that is fixed to the tip and has an insertion hole through which the tip of the lower steel bar can be inserted.
The tip of the upper steel bar is inserted into the insertion hole of the lower perforated plate, the tip of the lower steel is inserted into the insertion hole of the upper perforated plate, and the lower perforated plate and The upper perforated plate is arranged so as to extend over the lower steel bar and the upper steel bar.
When the lower structure and the upper structure are displaced between layers at the time of an earthquake, the lower side perforated plate and the upper side perforated plate to the lower side with respect to the lower side steel bar and the upper side steel bar. A seismic isolation damper characterized in that by applying a force in a direction orthogonal to the axis of the steel bar and the upper steel bar, the lower steel bar and the upper steel bar are bent and deformed to absorb seismic energy. The lower steel bar and / or the upper steel bar is a claim in which the ends of the reinforcing bars arranged inside the lower structure and / or the upper structure are extended, respectively. The seismic isolation damper according to any one of items 1 to 6. It is a seismic isolation structure provided in a seismic isolation layer in which the lower structure and the upper structure have a predetermined interval.
It has the seismic isolation damper and the isolator according to any one of claims 1 to 7, and the seismic isolation damper is installed so as to surround the isolator installed between the lower structure and the upper structure. Seismic isolation structure characterized by being. It is a seismic isolation structure provided in a seismic isolation layer in which the lower structure and the upper structure have a predetermined interval.
The seismic isolation damper and the isolator according to any one of claims 1 to 7 are provided, and some of the plurality of sets of the lower structure and the upper structure provided in the seismic isolation layer may be used. A seismic isolation structure characterized in that only the seismic isolation damper is provided and only an isolator is provided in the other set.

Images