JP2018127862A - Structure of column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a column to which a base isolation technique or a vibration control technique is applied according to a circumstance inherent to a building.SOLUTION: A structure of a column (10) includes: an upper column member (12) and a lower column member (14) arranged in a vertical direction with a gap; a pair of base plates (16 and 18) which are fixed to both of the upper and lower column members and face each other in a vertical direction; a support member (20) which is arranged between both of the base plates and supports the upper column member on the lower column member; at least a pair of steel rod-like members (22) which are fixed to both of the base plates and extend to the vertical direction, and face each other; and a buckling prevention member (24) which is supported by both of the base plates or the support member and prevents buckling of each of the rod-like members.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a column structure that suppresses shaking of a building caused by seismic force.

  2. Description of the Related Art Conventionally, there has been proposed a column structure that suppresses the shaking of a building caused by an earthquake (see Patent Document 1 below). This column is composed of an upper column member and a lower column member that are spaced apart from each other in the vertical direction, and a support member that is disposed between the upper and lower column members and supports the upper column member on the lower column member. And a pair of panel-shaped dampers (shear-type panel dampers) facing each other. The support member functions to support the building that exerts a vertical load on it, and the shear type panel damper absorbs a part of the seismic energy by the plastic deformation when the seismic force acts on the building and suppresses the shaking of the building Acts as a vibration control.

JP 2014-58790 A

By the way, depending on the size, usage, structure type, shape, etc. of the building, the suppression of the shaking of the building may be preferably based on the seismic isolation technique or may be based on the seismic control technique.
An object of the present invention is to provide a column structure to which seismic isolation technology or seismic control technology can be applied according to the scale, application, structure type, shape, etc., which are unique circumstances of a building. is there.

  The column structure according to the present invention includes an upper column member and a lower column member that are spaced apart from each other in the vertical direction, a pair of base plates that are fixed to both the upper and lower column members and are opposed to each other in the vertical direction, A support member that is disposed between the base plates and supports the upper column member on the lower column member; and at least a pair of steel rod members that are fixed to the base plates and extend in the vertical direction; A buckling prevention member for preventing buckling of each rod-like member supported by the support member;

  According to the present invention, when a seismic force acts on the building, the support member between the pair of base plates fixed to both the upper and lower column members serves to support the building, and the seat by the buckling prevention member. At least a pair of rod-shaped members that receive the bending-preventing action are deformed in the respective axial directions, thereby suppressing the shaking of the building.

  In the present invention, the bending rigidity can be set to a desired size by selecting the cross-sectional area, the length dimension, etc. of at least a pair of rod-shaped members. By setting the bending rigidity to be relatively small, the rod-shaped member can have a seismic isolation function. Further, by selecting the strength of the rod-shaped member, the rod-shaped member can have a vibration control function like a damper. Therefore, according to the present invention, the seismic isolation technique or control is suitable as a technique suitable for suppressing the shaking of the building during an earthquake, depending on the scale, application, structure type, shape, etc. of the building, which are unique circumstances of the building. Seismic technology can be selected and applied.

  The support member may be made of a concrete-filled steel pipe, for example.

  Each base plate has a hole through which each end of each bar-shaped member is passed, and each end of each bar-shaped member has a thread, and each bar-shaped member is arranged above and below each base plate and It can be fixed to both base plates via a pair of nuts screwed to the respective end portions of the rod-shaped member. According to this, the rod-shaped member can be easily replaced after the earthquake.

  The buckling prevention member is a plate body horizontally supported by the support member and having a hole through which each rod-shaped member passes, or a tube body having a length dimension smaller than the interval between both base plates. It can consist of a tubular body surrounding the periphery of the member. The tube body may be fixed to one of both base plates. The wall of the hole of the plate body and the inner wall of the tube body function to suppress the bending of each rod-like member, thereby preventing the rod-like member from buckling when receiving a compressive force in its axial direction. Is done.

It is a perspective view which shows a part of structure of the pillar which concerns on one Embodiment of this invention. It is a partial longitudinal cross-sectional view of the structure of the pillar shown in FIG. It is a top view which shows an example of a buckling prevention member. It is a perspective view which shows a part of structure of the pillar which concerns on other embodiment of this invention.

  Referring to FIGS. 1 and 2, the structure of a pillar 10 according to an embodiment of the present invention is shown.

  The pillar 10 that is a component of the building includes an upper pillar member 12 and a lower pillar member 14 that are spaced apart from each other in the vertical direction. The illustrated upper column member 12 and lower column member 14 are each formed of a square steel pipe. The upper and lower column members 12 and 14 may be made of, for example, H-shaped steel, reinforced concrete, steel reinforced concrete, or the like instead of the illustrated example.

  The column 10 further includes a pair of upper and lower column members 12, 14, more specifically, a pair of upper and lower column members 12 fixed to each other in the vertical direction, for example, by welding to the lower end surface of the upper column member 12 and the upper end surface of the lower column member 14. Steel base plates 16 and 18. The illustrated base plates 16 and 18 have a rectangular planar shape. The upper base plate 16 and the lower base plate 18 respectively cover the lower end surface of the upper column member 12 and the upper end surface of the lower column member 14, and a part of each base plate 16, 18 is the upper and lower column members 12, 14. Projecting horizontally from the end face.

  The column 10 also includes a support member 20 disposed between the base plates 16 and 18, a pair of steel rod-shaped members 22 that are fixed to the base plates 16 and 18 and extend in the vertical direction, and a support member 20. And a buckling prevention member 24 supported by.

  The support member 20 supports the upper column member 12 on the lower column member 14. The support member 20 transmits the vertical load of the building from the upper column member 12 to the lower column member 14 and functions to support the building. The support member 20 may be made of a steel pipe 28 filled with concrete 26, that is, a concrete-filled steel pipe.

  The support member 20 preferably further includes a reinforcing bar 30 embedded in the concrete 26 of the concrete-filled steel pipe and extending along the axis of the steel pipe 28. According to this, the resistance capability of the concrete filled steel pipe to the tensile force acting on the concrete filled steel pipe during an earthquake can be further increased. In the illustrated example, the reinforcing bar 30 has both end portions 30a provided with threads, and both end portions 30a pass through two holes 16a and 18a provided in both base plates 16 and 18, respectively, in the upper column member 12 and in the lower portion. It extends into the column member 14. The concrete-filled steel pipe is fixed to both base plates 16 and 18 via two nuts 32 screwed into both end portions 30a of the reinforcing bar 30, respectively.

  The support member 20 is made of, for example, a steel frame instead of the concrete-filled steel pipe or the concrete-filled steel pipe having the rebar 30 and made of a steel frame, made of reinforced concrete or steel as shown in FIG. Or a prism (made of steel) made of reinforced concrete or steel (not shown).

  Each illustrated rod-shaped member 22 has both end portions 22a provided with threads. The upper base plate 16 and the lower base plate 18 further have two holes 16b and two holes 18b, respectively. Both end portions 22a of each rod-like member 22 are passed through two holes 16b, 18b of both base plates 16, 18 and extend upward and downward. Each bar-shaped member 22 is fixed to both base plates 16 and 18 via a pair of nuts 32 and 34 that are arranged above and below each base plate 16 and 18 and screwed into each end 2a of each bar-shaped member 22, respectively. ing. Thereby, the space | interval between both the baseplates 16 and 18 of each rod-shaped member 22 can be kept constant. When the building receives a seismic force in the horizontal direction and the column 10 is bent, the pair of rod-shaped members 22 expands and contracts in the axial direction by receiving a tensile force and a compressive force, thereby suppressing the shaking of the building. To work.

  The bending rigidity of the rod-shaped member 22 can be set to a desired size by selecting the cross-sectional area, the length dimension, etc. of the rod-shaped member 22. When the magnitude of the bending rigidity is set to be relatively small, the rod-like member 22 exhibits a seismic isolation function and contributes to suppression of the shaking of the building. Further, by selecting the strength of the rod-shaped member 22, the rod-shaped member 22 exhibits a vibration control function like a damper and contributes to the suppression of the shaking of the building. From this, depending on the inherent circumstances of the building, that is, the structure of the pillar 10 with the seismic isolation function superiority or the structure of the column 10 with the seismic isolation function superiority, depending on the scale, application, structure type, shape, etc. of the building can do.

  The buckling prevention member 24 can be made of a steel plate body horizontally supported by the support member 20, for example, a disc. In the illustrated example, the disk has a circular hole 24a provided at the center thereof. The disc is arranged at a position where the rod-like member 22 is expected to buckle between the base plates 16 and 18, for example, at an intermediate position between the base plates 16 and 18, and the steel pipe 28 of the support member 20 extending through the hole 24a. It is fixed by welding.

  The disk constituting the buckling prevention member 24 has a pair of holes 24b through which the pair of rod-shaped members 22 penetrate. The rod-shaped member 22 is in contact with the wall surface (hole wall surface) of the hole 24b, or extends with a slight gap (for example, (length (mm) of the rod-shaped member 22) / 300) between the hole wall surface and the hole wall surface. Yes. When the rod-shaped member 22 receives a compressive force in its axial direction, the wall surface of the hole 24b suppresses the curvature exceeding its elastic range, thereby preventing its buckling. The buckling prevention member 24 can be composed of two or more plates parallel to each other, instead of the illustrated example. Further, the buckling prevention member 24 may be formed of a tube surrounding the periphery of each rod-shaped member 22 as indicated by an imaginary line in FIG. The tubular body (24) has a length smaller than the distance between the upper and lower base plates 16, 18, and is fixed to the lower base plate 18 at one of its upper and lower ends, for example, at its lower end, with its upper end at the upper side. It is set as the free end which is not restrained by the base plate 16 of this. For this reason, the tubular body (24) is free from deformation following the movement of the base plates 16 and 18 during an earthquake, and thereby the function of preventing the buckling of the rod-shaped member 22 is secured. Instead of this example, both ends of the tubular body (24) can be in an unfixed state with respect to both the base plates 16 and 18. The tubular body (24) is supported by a support member through one or a plurality of plate members (not shown) that are penetrated by the support member 20 and fixed to the support member. 20 can be supported. In this case, the tubular body is passed through a hole provided in the plate member and fixed to the plate member.

  Instead of the illustrated example of a pair of rod-shaped members 22, a plurality of pairs of rod-shaped members arranged at arbitrary positions can be used. Preferably, as shown in FIG. 3, a plurality of pairs (four pairs in the illustrated example) of rod-like members 22 (denoted with reference numerals 22A, 22B, 22C and 22D for convenience) can be used. In the example shown in the figure, two pairs of rod-like members 22A and 22B are spaced 90 degrees around the support member 20 so as to be able to cope with the direction of earthquake input to the building as much as possible. Further, two pairs of rod-like members 22C and 22D are arranged around the support member 20 at an angular interval of 90 degrees. In the illustrated example, the buckling prevention member 24 is formed of a rectangular plate and has a plurality (eight in the illustrated example) of holes 24b through which the rod-shaped members 22 pass.

DESCRIPTION OF SYMBOLS 10 Column 12 Upper column member 14 Lower column member 16, 18 Base plate 20 Support member 22 Bar-shaped member 24 Buckling prevention member 26 Concrete 28 Steel pipe 30 Reinforcing bar

Claims (5)

An upper column member and a lower column member that are spaced apart from each other in the vertical direction;
A pair of base plates fixed to both upper and lower column members and facing each other in the vertical direction;
A support member disposed between the base plates and supporting the upper column member on the lower column member;
At least a pair of steel rods opposed to each other, fixed to both base plates and extending in the vertical direction;
The structure of a pillar provided with both base plates or the buckling prevention member for preventing buckling of each rod-shaped member supported by the said support member. Each base plate has a hole through which each end of each bar-shaped member is passed, and each end of each bar-shaped member has a thread,
The columnar members according to claim 1, wherein each bar-like member is fixed to both baseplates via a pair of nuts arranged above and below each baseplate and screwed to each end of each bar-like member. Construction.   The columnar structure according to claim 1, wherein the buckling prevention member is a plate body that is supported horizontally by the support member and has a hole through which each rod-shaped member passes.   The columnar structure according to claim 1 or 2, wherein the buckling prevention member is a tubular body having a length dimension smaller than a distance between both base plates and surrounding each rod-shaped member.   The column structure according to claim 4, wherein the tubular body is fixed to one of the base plates.

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