JP2000297471A - Pillar support structure and earthquake-resistant building - Google Patents

Abstract

(57) [Abstract] [Problem] To reduce the axial force acting on a column during an earthquake and the reaction force of a pile. SOLUTION: A corner post 1 of a building is provided in a floating state with a gap 2 secured on a support surface, and a support structure 3 is provided adjacent to a column base of the corner post. The column base is connected to the column base by a support member 4, which can support a long-term load acting on the column and, when receiving a load exceeding that, yields and allows a downward displacement of the column. The load can be transmitted to the support surface. A steel damper made of extremely mild steel is used as a support member. The column base and the support structure are provided with a stopper mechanism 13 for preventing pull-out. The columns of the support structure are staggered. The multi-story shear wall is supported by the columns having the support structure and the high toughness columns.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a column base in a building and an earthquake-resistant building employing the structure.

[0002]

2. Description of the Related Art When a seismic force acts on a middle or high-rise building, a large axial force is generated on a column due to a falling moment as shown in FIG. The axial force is larger at the pillars located at the outer periphery than at the pillars located at the inner periphery. In particular, in a building subjected to seismic force in two directions, an excessive axial force is applied to the corner pillar 1 located at the corner of the building. Therefore, the reaction force of the pile becomes excessive, and it may be difficult to design the corner post 1 and the pile.

[0003]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a column base supporting structure capable of reducing an axial force acting on a column during an earthquake and a reaction force of a pile, and adopting the structure. An object of the present invention is to provide an earthquake-resistant building having excellent seismic performance.

[0004]

According to the first aspect of the present invention, there is provided a pillar base supporting structure in which a pillar of a building is provided in a floating state with a gap secured on a supporting surface, and is adjacent to the pillar base of the pillar. At the very least, a support structure is provided and the support structure and the column base are connected by a support member, and the support member can support a long-term load acting on the column and receives a load exceeding it. Is to allow the column to yield and allow the column to be displaced downward, thereby transmitting the load to the support surface.

[0005] The supporting structure for the column base of the invention according to claim 2 employs a steel damper made of extremely mild steel as the supporting member.

According to a third aspect of the present invention, in the column base supporting structure, the column base and the supporting structure are engaged when a pulling load acts on the column and the column base is displaced upward. Then, a stopper mechanism for preventing pulling out is provided.

According to a fourth aspect of the present invention, there is provided an earthquake-resistant building in which a pillar supporting a column base by the support structure is arranged at a corner of the building.

According to a fifth aspect of the present invention, there is provided an earthquake-resistant building in which the pillars supporting the pillars by the support structure are arranged in a staggered manner.

According to a sixth aspect of the present invention, there is provided the earthquake-resistant building, wherein a column supporting the column base by the support structure is arranged below the multi-story earthquake-resistant wall, and the column supports the multi-story earthquake-resistant wall. A column having relatively high toughness is adopted as another column that supports the multi-story earthquake-resistant wall in pair with the column, and two sets of the multi-story earthquake-resistant walls are provided, and the multi-story earthquake-resistant walls are made of steel. Each layer is connected by a connecting beam functioning as a damper.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. In the first embodiment, as shown in FIG. 1, a corner post 1 located at a corner of a building is provided in a state where a slight gap (gap) 2 is secured on a support surface and floated.
A support structure 3 provided adjacent to the column base of the corner post 1
And a column base are connected by a support member 4. Reference numeral 5 denotes a normal column located in the middle part, 6 denotes a beam, 7 denotes a foundation, and the foundation 7 includes a footing 8, a pile 9, and an underground beam 10.

The above-mentioned support structure 3 is a highly rigid frame installed on the foundation 7. The support member 4 is capable of supporting a long-term load acting on the corner post 1 together with the support structure 3, and when the corner post 1 receives a short-term load during an earthquake, yields to the corner post 1. 1 is allowed to displace downward, and the short-term load is transmitted directly to the foundation 7 by bringing the lower end surface of the corner post 1 into contact with the support surface. Extremely mild steel is used as the support member 4, and when it yields, it also functions as a steel damper that absorbs vibration energy by plastic deformation. In addition, the flange 11 provided on the pillar base
And a slight gap (gap) 12 between the support structure 3 and the upper part.
And these constitute a stopper mechanism 13, and excessive upward displacement of the corner post 1 due to a pulling load is restrained by the stopper mechanism 13. In FIG. 1, reference numeral 14 denotes a rubber member for shock absorption.

The corner post 1 supported by the above structure exhibits a behavior as shown in FIG. That is, this corner post 1
Normally supports a long-term load without any trouble via the support member 4 and the support structure 3, but when a short-term compressive axial force exceeding the expected value is applied during an earthquake, the support member 4 yields and corners Short-term load is transmitted to the foundation 7 only after the lower displacement of the column 1 is allowed and the lower end surface of the corner column 1 comes into contact with the support surface, and thereafter, sufficient axial compression strength is exhibited. Further, when a pull-out load greater than the assumed value is applied, the support member 4 yields and the upward displacement of the corner post 1 is allowed, and the pull-out load is transmitted to the foundation 7 only after the stopper mechanism 13 is engaged. After that, it exhibits excellent axial tensile strength. Therefore, according to the above structure, an excessive axial force does not immediately act on the corner post 1 and the pile 9 supporting the same, unlike the conventional case, and the corner post 1 and the support are provided as shown in FIG. The axial force of the pile 9 can be reduced to about the same level as the other pillars 5, and as a result, the corner columns 1 and the piles 9 can be designed more easily than in the past, and the cost can be reduced. Further, since the support member 4 also functions as a steel damper, it is possible to reduce the response by absorbing the energy.

The above-described construction of the corner post 1 is performed by temporarily supporting the corner post 1 with a temporary support member while the support structure 3 and the support member 4 are being constructed while finally supporting the corner post 1. Can be performed without any hindrance by removing. At that time, settlement due to long-term load is also taken into consideration. When residual deformation occurs after the earthquake, the height of the corner post 1 may be adjusted with a jack and the support member 4 may be replaced.

4 and 5 show a second embodiment of the present invention (FIG. 5 is an elevation view of a portion V in FIG. 4). In the second embodiment, as shown in FIG. 5, a column 23 formed by supporting a column base portion in a floating state with a gap (gap) 22 secured by a support structure 21 via a support member 20 is provided. This is a staggered arrangement in a planar building as shown in FIG. Reference numeral 24 denotes a normal pillar supported in a normal form, and as a result, the pillars 23 are alternately arranged in a staggered manner. Reference numeral 25 denotes a beam spanned between the columns 23 and 24. The support structure 21 according to the second embodiment is also a high-rigidity frame similar to the support structure 3 according to the first embodiment, but the pull-out restraint stopper mechanism 13 is omitted in the second embodiment. Similarly to the first embodiment, the support member 20 of the second embodiment is also made of extremely mild steel, and can support a long-term load, yields during an earthquake, allows the column 23 to displace downward, and reduces the short-term load. It transmits to the foundation 7 and at this time also functions as a steel damper.

In this building, not only can the energy absorbing effect of the support member 20 be obtained during an earthquake, but also the columns 23 and the normal columns 24 are staggered, so that the columns 23 and 24 are different during an earthquake. The beam 25 exhibits a deformation behavior, so that the beam 25 erected between the columns 23 and 24 is also deformed, and an energy absorbing effect due to the nonlinearity can be expected. As a result, a large attenuation is added to the whole building, and the response is reduced.
The design of 3, 24 and the pile 9 becomes easy, and the cost can be reduced.

FIGS. 6 to 9 show a third embodiment of the present invention (FIG. 7 is an enlarged view of a portion VII in FIG. 6). This is because a series of multi-story earthquake-resistant walls 31 formed by the earthquake-resistant walls 30 provided on each layer above the second layer are supported on the first layer by a pair of columns 32 and 33, and two sets of the multi-story earthquake-resistant walls 31 are provided. The present invention is applied to a building having a structure in which they are connected to each other by a connecting beam 34 in each layer, and the column 32 of the pair of columns 32, 33 supporting each multi-story shear wall 31 is the same as the second embodiment. Similarly, the gap 35 is supported by the support structure 37 via the support member 36 in a state where the gap 35 is secured and floated, and
The other column 33 is a column having higher toughness.

The support structure 37 and the support member 36 in the third embodiment are the same as those in the second embodiment.
Further, as the column 33 having high toughness, for example, a filled steel pipe concrete column formed by filling a steel pipe with concrete can be suitably used. The connecting beam 34 of each layer is made of extremely mild steel and functions as a steel damper that absorbs vibration energy due to deformation during an earthquake.

According to the building having the above structure, in the event of an earthquake, the support member 36 yields, thereby allowing the column 32 to be displaced downward and the highly tough column 33 to be elastically deformed. As shown in FIG. 8, two sets of multi-story shear walls 31
Are deformed so as to be inclined, whereby the connecting beams 34 of each layer are greatly deformed, and the connecting beams 34 provide an excellent energy absorption effect in each layer, and as a result,
The response of the whole building is reduced. In addition, since two sets of multistory shear walls 31 and connecting beams 34 form a gate-shaped frame, the building does not collapse unless the connecting beams 34 are broken or the columns 33 are destroyed. It is an extremely safe frame.

When this type of multi-story earthquake-resistant wall 31 is provided, it has conventionally been general to provide the earthquake-resistant wall 30 on all layers including the first layer as shown in FIG. However, in such a case, stress concentrates on the first-layer earthquake-resistant wall 30, which may be crushed.
Further, the upper connecting member 34 is largely deformed, but the lower connecting member 34 is not so deformed, so that effective energy absorption is not performed as a whole. In contrast, in the third embodiment, in the first layer, the earthquake-resistant wall 30
Is omitted and the multi-story shear wall 31 is supported on the first layer by the pair of columns 32 and 33 as described above in such a manner that the overall inclination is allowed, so that the conventional problems can be effectively solved. ing.

[0020]

According to the first aspect of the present invention, the support structure for the column base is
A pillar of a building is provided in a floating state with a gap secured on a support surface, a support structure is provided adjacent to a column base of the column, and the support structure and the column base are connected by a support member. The support member is capable of supporting a long-term load acting on the column, and when receiving a load exceeding that, yields and allows the column to be displaced downward to transmit the load to the support surface. Therefore, it is possible to effectively prevent an excessive axial force from acting on the column, and a rational design is possible.

In the supporting structure of the column base according to the second aspect of the present invention, since a steel damper made of extremely mild steel is used as the supporting member, the steel damper effectively absorbs vibration energy during an earthquake to reduce the response. be able to.

In the column base supporting structure according to the third aspect of the present invention, since the column base and the supporting structure are provided with a stopper mechanism for restraining excessive upward displacement of the column base, the column can be effectively pulled out. Can be restrained.

According to the fourth aspect of the present invention, since the pillars supporting the pillars by the support structure are arranged at the corners of the building, it is possible to prevent an excessive axial force from acting on the corner pillars. As a result, the design is facilitated and the cost can be reduced.

In the earthquake-resistant building according to the fifth aspect of the present invention, since the columns supporting the column bases are staggered by the support structure, adjacent columns exhibit different behaviors, and the vibration damping effect of the entire building is obtained. Is obtained.

According to a sixth aspect of the present invention, there is provided the earthquake-resistant building, wherein a column supporting the column-base portion by the support structure is arranged below the multi-story earthquake-resistant wall, and the column supports the multi-story earthquake-resistant wall. A column having relatively high toughness is adopted as another column that supports the multi-story earthquake-resistant wall in pair with the column, and two sets of the multi-story earthquake-resistant walls are provided, and the multi-story earthquake-resistant walls are made of steel. Since each layer is connected by a connecting beam functioning as a damper, deformation occurs such that two sets of multi-story shear walls incline while maintaining parallelism, and therefore, excellent vibration damping effect by the entire connecting beam of each layer Is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a support structure for a column base according to a first embodiment of the present invention and an earthquake-resistant building thereby.

FIG. 2 is a diagram showing behavior during an earthquake.

FIG. 3 is a diagram for explaining the operation.

FIG. 4 is a schematic plan view of an earthquake-resistant building according to a second embodiment of the present invention.

FIG. 5 is an elevational view of the main part.

FIG. 6 is a schematic elevation view of an earthquake-resistant building according to a third embodiment of the present invention.

FIG. 7 is an elevational view of a main part of the same.

FIG. 8 is a diagram showing behavior during an earthquake.

FIG. 9 is a diagram showing the behavior of a building having a conventional general multi-story shear wall during an earthquake.

FIG. 10 is a schematic diagram showing a behavior when a seismic force is input to a building.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corner pillar (column) 2 Gap 3 Support structure 4 Support member 7 Foundation 9 Pile 13 Stopper mechanism 20 Support member 21 Support structure 22 Gap 23 Column 30 Earthquake-resistant wall 31 Multi-layer earthquake-resistant wall 32 Column (high tough column) 33 Height Tough column 34 connecting beam 35 gap 36 support member 37 support structure

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16F 15/02 F16F 15/02 K

Claims (6)

[Claims] 1. A pillar of a building is provided in a floating state with a gap secured on a supporting surface, and a supporting structure is provided adjacent to a pillar of the pillar, and the supporting structure and the pillar are connected to each other. Are connected by a support member, and the support member can support a long-term load acting on the column, and when receiving a load exceeding that, yields and allows the column to be displaced downward, thereby supporting the load. A support structure for a column base, which can be transmitted to a surface. 2. The column base supporting structure according to claim 1, wherein said supporting member is a steel damper made of extremely mild steel. 3. The pedestal and the support structure,
3. The column base support according to claim 1, further comprising a stopper mechanism that engages when the column base is displaced upward due to a pulling load acting on the column and restrains the column base from being pulled out. Construction. 4. An earthquake-resistant building, wherein a pillar supporting the pillar base by the support structure according to claim 1, 2, or 3 is arranged at a corner of the building. 5. An anti-seismic building comprising a support structure according to claim 1, 2 or 3, wherein the columns supporting the column bases are arranged in a staggered manner. 6. A supporting structure according to claim 1, 2 or 3, wherein a column supporting the column base is arranged below the multi-story earthquake-resistant wall, and the column supports the multi-story earthquake-resistant wall. A column having relatively high toughness is adopted as another column that supports the multi-story earthquake-resistant wall in pair with the column, and two sets of the multi-story earthquake-resistant walls are provided, and the multi-story earthquake-resistant walls are made of steel. An earthquake-resistant building characterized by being connected at each layer by tethers that function as dampers.