JP2010236180A - Earthquake-resistant structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earthquake-resistant structure capable of preventing design of the appearance of a building from being impaired, preventing this structure from being restricted by a shape of the building, and preventing the installation of an opening part from being restricted. <P>SOLUTION: In this earthquake-resistant structure having a plurality of stories each composed of a pin brace structure, the pin brace structure is provided with a communicating column 8 communicating from a foundation to a beam 6Aa in the uppermost part on the uppermost story in the predetermined plane of structure, a lower end of the communicating column 8 is joined with the foundation 2, and an upper end of the communicating column 8 is joined with the beam 6Aa in the uppermost part so that an angle α of deformation between stories of each story becomes equal within the plane of structure when earthquake occurs. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a multi-layer structure having a beam-winning pin brace structure.

For buildings, it is considered safer to design the columns stronger than the beams and distribute the energy from the earthquake to each layer. However, in low-rise residential buildings, the pin brace method or the wall type method where each layer yields independently is used. At present, it is widely used. In these structures, a specific layer yields alone. In particular, when the top layer yields and the final state of the building is determined, the building is extremely poor in energy absorption. On the other hand, a building with a structure in which all layers of the building yield at almost the same time and plasticize to the same extent is a building that is extremely rich in energy absorption and has high seismic performance.
Japanese Patent Laid-Open No. 2000-170392 discloses a structure for dispersing energy caused by an earthquake. This publication discloses a seismic reinforcement structure including a reinforcement frame along the outer surface of a building and a damper that attenuates the seismic response. According to this structure, energy concentration to the layer with weak proof strength and rigidity can be relieved, and high seismic performance can be exhibited.

JP 2000-170392 A

  However, the above-mentioned seismic reinforcement structure is installed along the outer surface, and there is a problem that the appearance design of the building is impaired. In addition, a flat wall surface is required for installation, and it is difficult to install on uneven surfaces. Even if the wall surface itself is flat, there are protrusions and wiring such as shutter boxes and signboards on the wall surface. And installation may be difficult. In addition, in the case of a building built on a narrow site with a small frontage, it is desirable to secure as large an opening as possible for daylighting, ventilation, and going in and out. Easy to be restricted. In particular, it is difficult to install an open door or window in such an opening.

  An object of the present invention is to provide a seismic structure that does not impair the appearance design of a building, is not easily restricted by the shape of the building, and is less likely to be restricted in the installation of openings.

The present invention is a multi-layer earthquake-resistant structure comprising a pin brace structure,
In the pin brace structure, a communication column that communicates from the foundation to the uppermost beam in the uppermost layer is arranged with a predetermined construction surface, the lower end of the communication column is joined to the foundation, and the upper end of the communication column is the uppermost part. To the other beam
It is characterized in that the interlayer deformation angle of each layer is equal in the frame during an earthquake.

  Since this seismic structure has the above-described configuration, it is possible to obtain an excellent effect that the external appearance design of the building is not impaired, it is difficult to be restricted by the shape of the building, and the opening is hardly restricted.

Further, it is preferable that the connection between the communication column and the beam of each layer is a rigid connection.
When such a configuration is adopted, when a large seismic force is applied, the beam can be plastically deformed to absorb energy. This further increases the earthquake resistance.

Further, it is preferable that the communication column and the beams of each layer are joined by a damper.
By adopting such a configuration, energy can be reliably absorbed by the damper even at a relatively small level of seismic force. Thereby, the earthquake resistance can be further improved.

  According to the present invention, the appearance design of the building is not impaired, the restriction due to the shape of the building is not easily received, and the opening is not easily restricted.

It is a top view which shows 1st Embodiment of the earthquake-resistant structure which concerns on this invention. It is sectional drawing which follows the II-II line | wire of FIG. It is a front view which shows the load bearing panel applied to the earthquake proof structure which concerns on this invention. It is a perspective view which shows an example of pin joining. It is a perspective view which shows an example of rigid joining. It is the schematic which models and shows the state at the time of an earthquake. It is sectional drawing which shows 2nd Embodiment of the earthquake-resistant structure which concerns on this invention. It is a perspective view which shows an example of damper joining. It is the schematic which models and shows the state at the time of an earthquake.

  Hereinafter, preferred embodiments of an earthquake-resistant structure according to the present invention will be described in detail with reference to the drawings.

[First Embodiment]
As shown in FIG.1 and FIG.2, the earthquake-resistant structure 1 which consists of a pin brace structure (shaft construction method) is utilized for the industrialized house where a frame is comprised combining the floor panel and wall panel which consist of ALC. The seismic structure 1 has a steel frame structure with three upper and lower layers, and the height of each layer is unified.

  The seismic structure 1 includes corner pillars 3 disposed at the four corners of the foundation 2, a middle pillar 4 disposed between the corner pillars 3, an outer beam 5 extending between the corner pillars 3, a floor panel and a ceiling panel. Are provided with an inner beam 6 and a communication column 8 to be described later.

  The foundation 2 is composed of a reinforced concrete cloth foundation having an inverted T-shaped cross section, and includes a rectangular outer portion 2A and an inner portion 2B extending in a cross shape so as to pass through the frame portion 2A. The corner pillar 3 and the middle pillar 4 are erected on the outer side 2A, and the communication column 8 is erected on the intersection of the inner side 2B.

  The relationship between the corner column 3 and the outer beam 5 and the relationship between the middle column 4 and the outer beam 5 which are erected on the outer side 2A of the foundation 2 form a beam-winning frame structure. That is, the corner pillar 3 is divided by each layer, and similarly, the middle pillar 4 is also divided by each layer, and the outer beam 5 is supported by the lower corner pillar 3 and the upper end of the middle pillar 4, and the upper corner pillar 3. The lower end of the middle column 4 is supported by the outer beam 5, and the outer beam 5 continuously extends without being divided by the middle column 4.

  The outer beam 5 is made of H-shaped steel, the corner column 3 and the middle column 4 are made of square steel pipes, and the upper and lower ends of the corner column 3 and the middle column 4 are fixed to the outer beam 5 by bolts. Further, the inner beam 6 made of H-shaped steel includes, in each layer, a large beam 6A extending between the middle column 4 and the communication column 8, and a small beam 6B extending between the large beam 6A and the outer beam 5. Consists of.

  A communication column 8 is provided at approximately the center of gravity of the earthquake-resistant structure 1 so as to communicate from the inner side 2B of the foundation 2 to the uppermost beam 6A in the uppermost layer. The communication column 8 is formed of a square steel pipe having high rigidity and strength, and does not cause deformation or breakage that affects the earthquake resistance even in the event of a large earthquake. Further, the relationship between the communication column 8 and the large beam 6A is a so-called column winning structure in which each large beam 6A is divided by the communication column 8.

In each layer, a load-bearing panel (seismic element) S is appropriately arranged. As shown in FIG.
The load-bearing panel S includes two pairs of load-bearing members 20 that are arranged adjacent to each other in the vertical direction between the pair of middle pillars 4 and the middle pillars 4 </ b> A that are erected at a predetermined interval.

  The upper end and the lower end of the middle pillar 4 are connected to the outer beam 5 by a pin joint P (see FIG. 4), and only the lower end of the lowermost middle pillar 4 is a pin joint P to the foundation 2 (see FIG. 4). It is connected. Similarly, the upper end and the lower end of the middle pillar 4A are connected to the large beam 6A by a pin joint P, and only the lower end of the lowermost middle pillar 4A is connected to the foundation 2 by a pin joint P.

  The load bearing member 20 includes a plurality of frames 21 a to 21 e, and includes a frame member 21 that is fixed to the pair of middle pillars 4 and 4 </ b> A and a connecting member 22 that is used to connect the frame member 21. The frame member 21 includes a vertical frame 21a fixed with bolts along the middle pillar 4A, and a horizontal frame 21b whose one end is welded to a center position in the height direction of the vertical frame 21a and is perpendicular to the vertical frame 21a. The first diagonal frame 21d and the second diagonal frame 21e are welded to the upper and lower ends of the vertical frame 21a and extend obliquely downward and diagonally upward. The other end of the horizontal frame 21b and the other ends of the first and second oblique frames 21d and 21e are fixed to the joining plate 21c by welding or bolts. The frame member 21 forms an isosceles triangle as a whole.

  A frame member 21 having a similar configuration is also fixed to the middle column 4 side, a pair of left and right frame members 21 are arranged between the middle column 4 and the middle column 4A, and a joining plate 21c of the left frame member 21 and the right side The connecting plate 21 c of the frame member 21 is connected by a connecting member 22. Each joint plate 21c and the connecting member 22 are provided with bolt holes, and the connecting member 22 connects the pair of left and right joining plates 21c using bolts inserted into the bolt holes.

  The frame member 21 has high rigidity and proof strength, and does not cause deformation or breakage that affects the quake resistance even in the event of a large earthquake. The connecting member 22 has a butterfly shape in front view and is made of extremely low yield point steel. The constricted portion is configured to absorb the energy of seismic force by plastic deformation by an external force exceeding a predetermined value. The number of the connecting members 22 is appropriately changed according to the required amount of energy absorption.

  As shown in FIGS. 1 and 2, the lower end of the communication column 8 is erected by a pin joint P with respect to the inner portion 2B of the foundation 2, and the upper end of the communication column 8 is rigid with respect to the uppermost beam 6Aa. They are connected by a joint G. The middle of the communication column 8 is connected to the middle beam 6Ab by a rigid joint G.

  As an example of the pin joint P described above, as shown in FIG. 4, a leg portion 30 having a cross-shaped cross section formed at the lower end of the communication column 8 and an anchor to the foundation 2 formed at the lower end of the leg portion 30. And a base plate 31 fixed with bolts. In this case, the leg 30 is bent to absorb the energy, and the bending moment is hardly transmitted.

  As an example of the rigid joint G, as shown in FIG. 5, the end face 25 of the large beam 6A is abutted against the communication column 8 and is firmly fixed by the bolt 26, so that the bending moment is transmitted. Yes.

  As shown in FIG. 6, when seismic force is applied to the seismic structure 1, even if the load ratio of the seismic force and the load ratio of the load-bearing panel S are different for each layer, it is forced by the communication column 8. Therefore, the interlayer deformation angle α of each layer is unified. That is, the deformation amount of the load-bearing panel S of each layer becomes equal. Therefore, the energy absorption amount of the load-bearing panel S of each layer does not vary, and energy is efficiently absorbed. When a large seismic force is applied, the connection between the communication column 8 and the large beams 6Aa and 6Ab is a rigid connection G, so that the large beams 6Aa and 6Ab are plastically deformed to absorb energy. Therefore, the seismic performance is improved.

  Further, the communication column 8 has a cross section larger than that of a normal column, does not impair the exterior design of the building, is not easily restricted by the shape of the building, and is not easily restricted in installation of the opening.

[Second Embodiment]
In the second embodiment, only the differences from the first embodiment will be described, and the same components will be denoted by the same reference numerals and the description thereof will be omitted.

  As shown in FIG. 7, in the earthquake-resistant structure 1A, the lower end of the communication column 8 is erected by a pin joint P with respect to the inner portion 2B of the foundation 2, and the upper end of the communication column 8 is connected to the uppermost beam 6Aa. On the other hand, they are connected by a pin junction P1. The middle of the communication column 8 is connected to the middle beam 6Ab by a pin joint P1.

  As an example of the pin joint P1, as shown in FIG. 8, the communication column 8 and the ends of the large beams 6Aa and 6Ab are connected via two parallel damper plates 33 extending in the vertical direction. There is no. One end of the damper plate 33 is welded to the large beams 6Aa and 6Ab, and the other end of the damper plate 33 is fixed to the communication column 8 by a bolt 34. This makes it difficult to transmit the bending moment. The damper plate 33 is made of low yield point steel.

  As shown in FIG. 9, when seismic force is applied to the seismic structure 1 </ b> A, even if the load ratio of the seismic force and the load ratio of the load-bearing panel S are different for each layer, it is forced by the communication column 8. Therefore, the interlayer deformation angle α of each layer is unified. That is, the deformation amount of the load-bearing panel S of each layer becomes equal. Therefore, the energy absorption amount of the load-bearing panel S of each layer does not vary, and energy is efficiently absorbed.

  The energy can be reliably absorbed by the damper plate 33 even at a relatively small level of seismic force. Thereby, the earthquake resistance can be further enhanced. Further, in order to make it possible to replace the damper plate 33 that has reached the end, the damper plate 33 may be connected to the large beams 6Aa, 6Ab and the communication column 8 with bolts so that the damper plate 33 is detachable.

  It goes without saying that the present invention is not limited to the embodiment described above. For example, although the said embodiment was an example which installed only one communication column 8 in the intersection of the middle street comparatively near the gravity center of a building, it is not limited to this. A plurality of communication columns 8 may be arranged in one building based on the relationship between the seismic force acting on the building and the rigidity and proof strength required for the communication column, balance, floor plan, and the like. Further, the composition surface may be at any position, and the communication column 8 may be erected on the outer side 2 </ b> A of the foundation 2.

  Further, the relationship between the corner column 3 and the outer beam 5 and the relationship between the middle column 4 and the outer beam 5 may be column winning. Further, as the damper joint, a high damping rubber damper, an oil damper or the like may be used instead of the damper plate 33. Further, a pin joint P as shown in FIG. 4 may be used at the upper end of the communication column 8.

  DESCRIPTION OF SYMBOLS 1,1A ... Earthquake-resistant structure, 2 ... Foundation, 6Aa, 6Ab ... Large beam (beam), 8 ... Communication column, 33 ... Damper plate (damper joint), P, P1 ... Pin joint, G ... Rigid joint, α ... Interlayer Deformation angle.

Claims (3)

In a multi-layer earthquake-resistant structure consisting of a pin brace structure,
The pin brace structure has a predetermined construction surface, a communication column that communicates from the foundation to the uppermost beam in the uppermost layer is disposed, and a lower end of the communication column is joined to the foundation, and an upper end of the communication column Is joined to the beam at the top,
A seismic structure characterized in that an interlayer deformation angle of each layer is equal in the surface during an earthquake.   The earthquake-resistant structure according to claim 1, wherein the connection between the communication column and the beam of each layer is a rigid connection.   2. The earthquake-resistant structure according to claim 1, wherein the communication column and the beam of each layer are joined by a damper.

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