JP6949653B2 - Board buckling suppression structure - Google Patents

Description

The present invention relates to a plate buckling suppression structure of a building.

As an example of the plate buckling suppression structure of a building, there is a panel damper that absorbs the shearing force applied in the horizontal direction with respect to the column. Some of these panel dampers are provided with a concave lens-shaped recess in the central portion to improve the plastic deformation ability (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-58790

By the way, as the displacement in the horizontal direction to be absorbed by the plastic deformation of the panel damper becomes larger, it is necessary to lengthen the panel damper in the vertical direction as well. There is a problem that it becomes easier.

The present invention has focused on such problems existing in the prior art. The purpose is to provide a structure capable of suppressing plate buckling.

The plate buckling suppression structure that solves the above problems includes a plate-shaped portion having a through hole and a reinforcing portion that reinforces the plate-shaped portion.

According to the present invention, plate buckling can be suppressed.

The perspective view which shows the 1st Embodiment of the plate buckling suppression structure. The front view of the plate buckling suppression structure of FIG. FIG. 2 is a cross-sectional view taken along the line 3-3 in FIG. The perspective view which shows the 2nd Embodiment of the plate buckling suppression structure. The perspective view which shows the modification example of the 1st Embodiment of the plate buckling suppression structure. The perspective view which shows the modification of the 2nd Embodiment of the plate buckling suppression structure. The perspective view which shows the modification example of the plate buckling suppression structure. The perspective view which shows the modification example of the plate buckling suppression structure. The perspective view which shows the modification example of the plate buckling suppression structure.

Hereinafter, embodiments of the plate buckling suppression structure will be described with reference to the drawings.
(First Embodiment)
The plate buckling suppression structure 11 of the present embodiment is arranged in the middle of a stud 21 of a building such as a steel frame structure, a lightweight steel frame structure, or a reinforced concrete structure. The stud 21 is, for example, an H-steel having a web 21a and flanges 21b extending from both ends of the web 21a, and the web height is Wh and the flange width is Dh.

The plate buckling suppression structure 11 includes a plate-shaped portion 13 having a through hole 12 and a reinforcing portion 14 for reinforcing the plate-shaped portion 13. In the present embodiment, the through hole 12 has a circular shape, and the reinforcing portion 14 is a tubular body inserted through the through hole 12. The upper end side and the lower end side of the plate-shaped portion 13 are fixed to the web 21a of the stud 21 by a fixing member 16 such as a bolt via, for example, a plate-shaped joining member 15. When the height dimension of the main body portion of the plate-shaped portion 13 is Hp and the width dimension is Wp, and the web height Wh of the H steel which is the stud 21 is larger than the width Wp of the plate-shaped portion 13, the plate-shaped portion 13 It is preferable to extend the upper end side and the lower end side of the above while widening the width, and join the widened extension portion to the web 21a.

In the present embodiment, the plate-shaped portion 13 is a steel plate arranged in the middle of the stud 21, and the reinforcing portion 14 is a cylindrical steel pipe inserted into the through hole 12. The reinforcing portion 14 made of a steel pipe may be welded while being inserted into the through hole 12 so that the position does not shift. In this case, since simple welding such as fillet welding is sufficient, quality deterioration due to heat effect is unlikely to occur.

A plate-like portion 13 reinforcement portion 14, one of ordinary steel (e.g. lower yield point 235N / mm ^2, the upper yield point 325N / mm ²⁾ and, the lower yield point than the other ordinary steel Low Yield Strength Steel ( For example, the descending yield point may be 100 N / mm ² and the upper yield point may be 225 N / mm ² ).

When the plate-shaped portion 13 is made of low yield point steel, the actual buckling length is shortened by providing the through hole 12, so that plate buckling is less likely to occur. Further, since the stress applied to the plate-shaped portion 13 made of low yield point steel is dispersed in the reinforcing portion 14 made of ordinary steel joined to the through hole 12, local stress concentration is unlikely to occur.

On the other hand, when the reinforcing portion 14 is made of low yield point steel, the plate-shaped portion 13 made of ordinary steel restrains the local deformation of the reinforcing portion 14, so that the reinforcing portion 14 is less likely to be deformed. At this time, by dispersing the stress around the reinforcing portion 14, the stress can be dispersed throughout the plate buckling suppression structure 11. If it is desired to increase the plastic deformation ability, the plate-shaped portion 13 may be made of low yield point steel, and if the rigidity of the plate-shaped portion 13 is prioritized, the reinforcing portion 14 may be made of low yield point steel.

As shown in FIG. 2, the plate-shaped portion 13 has a square shape (for example, a square shape having an aspect ratio of 1: 1), and the through hole 12 and the reinforcing portion 14 arranged along the inner edge of the through hole 12 It is preferable that the two diagonal lines 13a and 13b intersect on the inner peripheral side. That is, the reinforcing portion 14 may be arranged at a position intersecting the diagonal lines 13a and 13b.

As shown in FIG. 3, the thickness dimension Dp of the plate-shaped portion 13 is preferably smaller than the axial length dimension Lp of the reinforcing portion 14 which is a tubular body. As a result, when the tubular body, which is the reinforcing portion 14, is inserted into the through hole 12, both ends of the tubular body protrude from both sides of the plate-shaped portion 13. The length dimension Lp of the reinforcing portion 14 is preferably equal to or less than the width of the stud 21. For example, when the stud 21 is made of H-steel, the length dimension Lp may be set to the flange width Dh (see FIG. 1) or less.

Next, the operation of the plate buckling suppression structure 11 of the present embodiment will be described.
When a shearing force is applied to the rectangular plate-shaped portion 13 in the horizontal direction, a tensile force acts along one of the two diagonal lines 13a and 13b that intersect each other, and a compressive force acts along the other. At this time, if the plate-shaped portion 13 buckles due to the compressive force, the proof stress sharply decreases. In particular, in order to allow a larger displacement during vibration such as an earthquake, it is necessary to increase the height dimension Hp of the plate-shaped portion 13, and buckling is likely to occur with such an increase in length. Further, if an attempt is made to increase the width-thickness ratio (plate width / plate thickness) in order to suppress buckling of the elongated plate-shaped portion 13, the thickness of the plate-shaped portion 13 increases. The total amount increases, which increases the cost and weight.

In that respect, when the through hole 12 is provided in the plate-shaped portion 13 of the plate buckling suppression structure 11, the width-thickness ratio of the portion extending along the diagonal lines 13a and 13b is substantially reduced, and the slenderness ratio (buckling length) is also provided. / Second moment of inertia) becomes smaller. Then, by reinforcing the plate-shaped portion 13 with the reinforcing portion 14, the decrease in the proof stress of the plate-shaped portion 13 is suppressed. Therefore, buckling can be suppressed without increasing the thickness of the plate-shaped portion 13.

Then, in the plate buckling suppression structure 11, the tensile force and the compressive force applied to the stud 21 are transmitted from the plate-shaped portion 13 to the cylindrical reinforcing portion 14, and flow in the circumferential direction of the cylindrical reinforcing portion 14. In this way, by dispersing the shear stress applied to the plate-shaped portion 13 throughout the plate buckling suppressing structure 11, the buckling of the plate-shaped portion 13 is suppressed.

If the shape of the through hole 12 and the cross-sectional shape of the reinforcing portion 14 are circular, local stress concentration is unlikely to occur. Further, by matching the shape of the through hole 12 with the cross-sectional shape of the reinforcing portion 14, the entire inner edge of the through hole 12 (inner peripheral edge when the through hole 12 is circular) is covered with the outer edge of the reinforcing portion 14 (reinforcing portion 14). In the case of a cylinder, when it comes into contact with the outer peripheral edge), the force is efficiently transmitted between the two.

According to the embodiment described in detail above, the following effects are exhibited.
(1) The plate buckling suppression structure 11 provided on the stud 21 functions as a panel damper, so that the vibration control property of the building provided with the stud 21 can be improved.

(2) By inserting the plate buckling suppression structure 11 in the middle of the stud 21, the plate buckling suppression structure 11 can be replaced when the plastic deformation of the plate-shaped portion 13 exceeds the limit.
(3) Since the through hole 12 is less likely to be deformed by the tubular body inserted through the through hole 12, the destruction of the plate-shaped portion 13 can be suppressed. Further, since the shearing force received by the plate-shaped portion 13 is transmitted to the reinforcing portion 14 which is a tubular body through the through hole 12, the shearing force can be efficiently absorbed in the entire structure.

(Second Embodiment)
Next, a second embodiment of the plate buckling suppression structure 11 will be described with reference to FIG.
In the second embodiment, those having the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, so the description thereof will be omitted, and the description will be focused on the points different from those in the first embodiment.

The plate buckling suppression structure 11 of the present embodiment is different from the above-described embodiment in that the plate buckling suppression structure 11 is arranged at a portion where the columns 22 and the beams 23 intersect in the building having the columns 22 and the beams 23. When the column 22 and the beam 23 are made of H steel, the portion where the column 22 and the beam 23 intersect is a plate-shaped portion 17a connected to the web 22a of the column 22 and the web 23a of the beam 23, and the flange 22b and the beam of the column 22. It is preferable to arrange the joint member 17 having the protruding edge portion 17b connected to the flange 23b of the 23.

The plate-shaped portion 17a of the joint member 17 has a through hole 12 and constitutes a plate buckling suppression structure 11. That is, the plate-shaped portion 17a of the present embodiment is arranged at the joint portion between the column 22 and the beam 23. Further, a reinforcing portion 14 made of a steel pipe is inserted into the through hole 12 of the plate-shaped portion 17a. The plate-shaped portion 17a and the reinforcing portion 14 can be made of the same steel material (for example, ordinary steel) as the columns 22 and beams 23.

When the joint member 17 is brought to the site by providing a through hole 12 in the plate-shaped portion 17a and attaching the reinforcing portion 14 in a factory or the like, and further processing the joint member 17 into a state of being joined to either the column 22 or the beam 23. Good workability. The joint member 17 may be provided with a through hole 12 or a reinforcing portion 14 may be attached after being joined to the column 22 and the beam 23 at the construction site of the building.

Next, the operation of the plate buckling suppression structure 11 of the present embodiment will be described.
In the present embodiment, since the plate-shaped portion 17a constituting the plate buckling suppression structure 11 is a part of the joint member 17 constituting the frame, the member added for seismic retrofitting constitutes the reinforcing portion 14. Only steel pipes are needed. Then, the shearing force applied to the joint portion between the column 22 and the beam 23 is dispersed between the plate-shaped portion 17a having the through hole 12 and the reinforcing portion 14 joined to the through hole 12, so that the shear seat of the plate-shaped portion 17a is distributed. Bending is suppressed.

According to the embodiment described in detail above, in addition to the above (3), the following effects are exhibited.
(4) The shear stress generated at the joint between the column 22 and the beam 23 can be absorbed by the plate-shaped portion 17a.

The above embodiment may be modified as in the modification shown below. Further, the configuration included in the above embodiment and the configuration included in the following modification example may be arbitrarily combined, or the configurations included in the following modification example may be arbitrarily combined. In the following description, components having the same functions as those described above will be designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIGS. 5 and 6, the plate buckling suppression structure 11 may include a plurality of (for example, three) plate-shaped portions 13, 17a. The number of plate-shaped portions 13, 17a can be arbitrarily changed. In this case, the reinforcing portion 14 may be a single tubular body that is inserted into the through holes 12 provided in the plurality of plate-shaped portions 13, 17a.

When a plate buckling suppression structure 11 having a plurality of plate-shaped portions 13 is arranged in the middle of the stud 21 of the first embodiment, as shown in FIG. 5, the upper and lower ends of the plate-shaped portions 13 are respectively placed on the plate member 18. It is preferable to join and connect the plate buckling suppression structure 11 to the stud 21 via the plate member 18.

As shown in FIG. 7, the plate buckling suppression structure 11 may include a flange plate 19 joined to the side ends (both side ends) of the plate-shaped portion 13. The flange plate 19 may project only on one side of the plate-shaped portion 13, or may project on both sides. When the plate buckling suppression structure 11 includes a plate member 18 to be joined to the upper and lower ends of the plate-shaped portion 13, the upper and lower ends of the flange plate 19 may also be joined to the plate member 18 by welding or the like. The flange plate 19 can suppress the plate buckling of the plate-shaped portion 13 while allowing the plate-shaped portion 13 to be deformed in the horizontal direction.

The width dimension of the plate member 18 may be the same as the width dimension Wp of the plate-shaped portion 13, or may be smaller than the width dimension Wp of the plate-shaped portion 13. In this case, the flange plate 19 may extend above or below the plate member 18.

The flange plate 19 may be connected to the flange 21b of the stud 21 or the flange 22b of the column 22.
When the plate buckling suppression structure 11 including the plate member 18 is arranged at a portion where the column 22 and the beam 23 of the second embodiment intersect, the plate member 18 may be connected to the flange 22b of the beam 23.

The plate buckling suppression structure 11 including the flange plate 19 does not have to include the plate member 18. For example, when the plate buckling suppression structure 11 provided with the flange plate 19 is arranged in the middle of the stud 21 of the first embodiment, the plate-shaped portion 13 may be connected to the web 21a without the plate member 18.

The width dimension Wp of the plate-shaped portion 13 may be the same as the web height Wh of the H steel which is the stud 21 or the pillar 22, or may be larger than the web height Wh.
-The board buckling suppression structure 11 may be adopted in a wooden building. In this case, the plate-shaped portion constituting the plate buckling suppression structure 11 may be made of the same material (wood) as the columns and beams.

The shape of the through hole 12 and the cross-sectional shape of the reinforcing portion 14 are not limited to a circle, and can be arbitrarily changed, for example, an ellipse or a polygon. Further, the shape of the through hole 12 and the cross-sectional shape of the reinforcing portion 14 may be different.

-A plurality of through holes 12 may be provided in the plate-shaped portion 13. In this case, the plurality of through holes 12 may be arranged at positions intersecting the diagonal lines 13a and 13b.
The reinforcing portion 14 may be an annular member attached to the outer surface of the plate-shaped portion 13 along the opening of the through hole 12, or a protruding edge portion protruding from the outer surface of the plate-shaped portion 13 along the through hole 12. It may be. That is, the reinforcing portion 14 does not necessarily have to be inserted into the through hole 12. Further, both a cylinder penetrating the through hole 12 and a protruding edge portion protruding along the through hole 12 may be provided.

The reinforcing portion 14 may be a rib extending so as to intersect the through hole 12. For example, a linear rib extending along the diagonal lines 13a and 13b can be used as the reinforcing portion 14. In this case, the rib may be provided alone, or may be provided together with the tubular body penetrating the through hole 12 or the protruding edge portion protruding along the through hole 12.

As shown in FIG. 8, the plate buckling suppression structure 11 may include a plate-shaped rib 20 to be joined to the outer periphery of the steel pipe as the reinforcing portion 14. According to this configuration, the rib 20 can enhance the reinforcing effect of the reinforcing portion 14. When such ribs 20 are used in a plate buckling suppression structure 11 having a plurality of (for example, three) plate-shaped portions 13, it is preferable to provide such ribs 20 in each of the plurality of plate-shaped portions 13. The rib 20 may be provided on only one side of the plate-shaped portion 13, or may be provided on both sides. Further, the protruding length of the rib 20 from the surface of the plate-shaped portion 13 may be the same as or different from that of the steel pipe as the reinforcing portion 14.

The rib 20 may be, for example, a horizontal rib 20h arranged horizontally with respect to the steel pipe, a vertical rib 20v arranged perpendicularly with respect to the steel pipe, or both of them. good. In addition, any number of ribs 20 can be arranged at arbitrary positions on the outer circumference of the steel pipe, such as linear ribs extending along the diagonal lines 13a and 13b (see FIG. 2). The rib 20 is preferably joined to the steel pipe by welding or the like, and is further preferably joined to the plate-shaped portion 13.

As shown in FIG. 9, the plate buckling suppression structure 11 includes a plate member 18 joined to the upper and lower ends of the plate-shaped portion 13, a flange plate 19 joined to the side end of the plate-shaped portion 13, and a reinforcing portion. A plate-shaped rib 20 joined to the outer periphery of the steel pipe as the 14 may be provided. In this case, the plate-shaped rib 20 is preferably joined to the plate member 18. When adopted in the plate buckling suppression structure 11 having a plurality of (for example, three) plate-shaped portions 13, the ribs 20 may be provided in the plurality of plate-shaped portions 13, respectively. The plate member 18 and the flange plate 19 may be provided on each of the plurality of plate-shaped portions 13, or one plate member 18 may be joined to the plurality of plate-shaped portions 13.

A flange such as the protruding edge portion 17b shown in FIG. 4 may be provided near the outer edge of the plate-shaped portion 13 arranged in the middle of the stud 21 of the first embodiment, and this flange may be used as the reinforcing portion 14. In this case, the flange may be provided alone, or may be provided together with a tubular body penetrating the through hole 12 or a protruding edge portion protruding along the through hole 12. In this case, the flange may project from only one surface of the plate-shaped portion 13, or may project from both sides.

-The reinforcing portion 14 may be a rod-shaped member having no hollow portion instead of a tubular body having a hollow portion. For example, the reinforcing portion 14 may be a rod-shaped member inserted into the circular through hole 12.
-When the reinforcing portion 14 is a tubular body having a hollow portion, a lid may be attached to the end portion of the tubular body. When the reinforcing portion 14 has a hollow portion, an elastic body may be inserted in the hollow portion to absorb stress, or concrete or the like may be inserted in the hollow portion to suppress deformation of the reinforcing portion 14 and the through hole 12. You may.

The technical idea and its action and effect grasped from the above-described embodiment and modification are described below.
[Thought 1]
A plate-shaped part with a through hole and
A reinforcing portion that reinforces the plate-shaped portion and
A plate buckling suppression structure characterized by being provided with.

According to the above [idea 1], the width-thickness ratio (plate width / plate thickness) is substantially reduced (or the slenderness ratio (buckling length / geometrical moment of inertia)) because the plate-shaped portion has a through hole. ) Becomes smaller). Then, by being reinforced by the reinforcing portion, the decrease in the proof stress of the plate-shaped portion is suppressed, so that buckling is less likely to occur.

[Thought 2]
The plate buckling suppression structure according to [Concept 1], wherein the reinforcing portion is a tubular body that is inserted into the through hole.

According to the above [idea 2], the through hole is less likely to be deformed by the tubular body inserted through the through hole, so that the destruction of the plate-shaped portion can be suppressed. Further, since the shearing force received by the plate-shaped portion is transmitted to the tubular body through the through hole, the shearing force can be efficiently absorbed in the entire structure.

[Thought 3]
The plate-shaped portion has a square shape,
The plate buckling suppression structure according to [Thought 1] or [Thought 2], wherein the two diagonal lines of the plate-shaped portion intersect in the through hole.

According to the above [Thought 3], in the quadrangular plate-shaped portion, the tensile force generated along one diagonal line and the displacement caused by the compressive force generated along the other diagonal line are absorbed by the through holes. Buckling of the plate-shaped portion can be suppressed. Further, when the tubular body is inserted through the through hole, both the above-mentioned tensile force and compressive force are transmitted to the tubular portion, so that the tensile force and compressive force applied to the plate-shaped portion are dispersed in the tubular portion to provide a shearing force. Can be efficiently absorbed by the entire structure.

[Thought 4]
The plate-shaped portion is a steel plate.
The plate buckling suppression structure according to any one of [Thought 1] to [Thought 3], wherein the reinforcing portion is a steel pipe joined to the through hole.

According to the above [idea 4], it is possible to suppress plate buckling in a building such as a steel structure, a lightweight steel structure, or a reinforced concrete structure.
[Thought 5]
The plate buckling suppression structure according to [Concept 4], which is provided with ribs joined to the outer periphery of the steel pipe.

According to the above [idea 5], the ribs can enhance the reinforcing effect of the reinforcing portion.
[Thought 6]
The plate-shaped portion and the reinforcing portion are made of a steel material.
The plate seat according to any one of [Thought 1] to [Thought 5], wherein one of the plate-shaped portion and the reinforcing portion is made of low yield point steel having a lower yield point than the other. Yield suppression structure.

According to the above [idea 6], when the plate-shaped portion is a low yield point steel, the plate buckling is less likely to occur by providing the through hole. Further, by inserting the steel pipe into the through hole, local stress concentration in the through hole is unlikely to occur, so that the stress can be dispersed throughout the structure. On the other hand, when the steel pipe is a low yield point steel, the plate-shaped portion restrains the local deformation of the steel pipe, so that the steel pipe is less likely to be deformed and the stress is dispersed around the steel pipe to disperse the stress throughout the structure. be able to. Therefore, when the vibration control by improving the plastic deformation ability is prioritized, the plate-shaped portion may be made of low yield point steel, and when the rigidity is prioritized, the reinforcing portion may be made of low yield point steel.

[Thought 7]
The plate buckling suppression structure according to any one of [Thought 1] to [Thought 6], wherein the plate-shaped portion is arranged in the middle of a stud.

According to the above [idea 7], by inserting a plate buckling suppression structure in the middle of the studs, the plate buckling suppression structure can be replaced when the plastic deformation of the plate-shaped portion exceeds the limit.
[Thought 8]
It is a board buckling suppression structure of a building with columns and beams.
The plate buckling suppression structure according to any one of [Thought 1] to [Thought 5], wherein the plate-shaped portion is arranged at a joint portion between the pillar and the beam.

According to the above [idea 8], the shear stress generated at the joint between the column and the beam can be absorbed by the plate-shaped portion.

11 ... Plate buckling suppression structure, 12 ... Through hole, 13 ... Plate-shaped part, 13a ... Diagonal line, 13b ... Diagonal line, 14 ... Reinforcing part, 15 ... Joining member, 16 ... Fixing member, 17 ... Joint member, 17a ... Plate-shaped portion, 17b ... ridge portion, 21 ... stud, 21a ... web, 21b ... flange, 22 ... pillar, 22a ... web, 22b ... flange, 23 ... beam, 23a ... web, 23b ... flange.

Claims (6)

Steel plate with through holes and
A steel pipe joined to the through hole for reinforcing the steel plate and
Equipped with a,
The steel sheet, plate seat restraint structure that will be disposed in the middle of the stud. The plate buckling suppression structure according to claim 1, wherein the steel pipe is a tubular body that is inserted into the through hole. The steel plate has a square shape,
The plate buckling suppression structure according to claim 1 or 2 , wherein the two diagonal lines of the steel plate intersect in the through hole. The plate buckling suppression structure according to any one of claims 1 to 3, wherein the steel pipe is inserted and fixed in the through hole, and both ends of the steel pipe in the axial direction protrude from the steel plate. .. The plate buckling suppression structure according to any one of claims 1 to 4, further comprising ribs joined to the outer periphery of the steel pipe. The plate buckling suppression structure according to any one of claims 1 to 5, wherein one of the steel plate and the steel pipe is made of a low yield point steel having a lower yield point than the other.

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