JP2010203143A - Base-isolated building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base-isolated building in which a bearing part of an upper structure and a lower structure can sufficiently withstand vertical load even if the upper structure is lightweight and a sliding member is installed at the lower end of a column with a small cross-sectional area while behaving smoothly when horizontal force is applied. <P>SOLUTION: The base-isolated building 1 includes a bearing type base isolating apparatus 4 provided with the sliding member 12 at the upper structure 2, and a sliding plate 23 at the lower structure 3. The lower structure 3 has a pressure slab 5 made of a rigid body; a deformation layer 21 made of an elastic body provided on the upper face of the pressure slab 5; and a pedestal part 22 made of a rigid body provided on the upper face of the deformation layer 21. The sliding member 12 is installed at the lower end of the column 10 of the upper structure 2, and the sliding plate 23 is installed on the pedestal part 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seismic isolation building including a sliding support type seismic isolation device in which a sliding member is provided in an upper structure and a sliding plate is provided in a lower structure.

  The sliding support type seismic isolation device provided in the seismic isolation building does not operate until the horizontal force due to the earthquake becomes equal to the frictional force acting between the sliding material and the sliding plate. Suddenly starts to operate when becomes a predetermined size. That is, the acceleration at the start of sliding of the seismic isolation device tends to increase. Even when the horizontal force converges, the seismic isolation device suddenly stops operating when the horizontal force falls below a predetermined magnitude, and the negative acceleration tends to increase. Therefore, there is a problem that the behavior of the base-isolated building at the start and stop of the operation of the base isolation device lacks smoothness.

  In Patent Document 1, a material (hereinafter referred to as “deformable material”) that can be deformed in accordance with a horizontal force before the sliding material starts to slide is referred to as the sliding contact surface (smooth plate) of the sliding material (upper housing side). There is a description of a sliding seismic isolation device that can increase the period of the seismic isolation device while keeping the acceleration of the slipping out small. According to this technology, it is possible to mitigate the impact force by deforming the deformable material according to the magnitude of the horizontal force when a small horizontal force acts before the seismic isolation device starts to slide. is there.

JP 2000-170829 A

  By the way, when the upper structure such as a middle- and low-rise steel frame house is a lightweight building, the pillar does not need a large cross-sectional area, and the cross-sectional area of the pillar becomes small. For this reason, when the above-mentioned deformable material is installed at the lower end portion of the column on the upper structure side, the area of the deformable material is also limited, and the area becomes small. As a result, there may be a problem in that the vertical load (axial force from the column) of the upper structure cannot be supported in the support portion of the base-isolated building including the deformable material. If the deformable material has a strength capable of supporting the upper structure, the deformable material becomes close to a rigid body and deformation is suppressed.

  The present invention solves the above-mentioned problems of the prior art, and when a horizontal force is applied, it behaves smoothly, and the upper structure is lightweight and a slip material is installed at the lower end of a column having a small cross-sectional area. However, an object of the present invention is to provide a base-isolated building in which the support portion of the upper structure and the lower structure can sufficiently withstand the vertical load.

  In order to achieve the above object, the present invention provides a base-isolated building including a sliding support type base isolation device in which a slip material is provided in an upper structure and a slip plate is provided in a lower structure. A pressure platen made of a rigid body, a deformation layer made of an elastic body provided on the upper surface of the pressure platen, and a pedestal part made of a rigid body provided on the upper surface of the deformation layer, and the sliding material is It is installed in the lower end part of the pillar of an upper structure, and the said sliding board is installed on the said base part, It is characterized by the above-mentioned.

  According to the present invention, the deformation layer is provided on the upper surface of the pressure plate of the lower structure, the pedestal portion made of a rigid body is provided on the upper surface of the deformation layer, and the slide plate is provided on the pedestal portion. When horizontal force is applied, the deformation layer is deformed and the base-isolated building behaves smoothly. In addition, since the deformation layer is provided on the lower structure side where the sliding plate has a larger area than the sliding material, the deformation layer is less subject to area restrictions, and as a result, the upper structure is lighter and the column with a smaller cross-sectional area. Even when slip material is installed at the lower end of the base, the support part of the base-isolated building can sufficiently withstand the vertical load of the upper structure.

  The upper structure may be provided with a stopper member that collides with the pedestal when the upper structure moves a predetermined distance in the horizontal direction with respect to the lower structure. In such a case, the maximum displacement of the upper structure can be limited. In addition, since the lower structure has a deformation layer made of an elastic body, the impact when the stopper member collides with the pedestal portion can be reduced.

  According to the present invention, even when a sliding material is installed at the lower end portion of a column that behaves smoothly when a horizontal force is applied, and the upper structure is lightweight and has a small cross-sectional area, It is possible to realize a base-isolated building where the support part of the structure can sufficiently withstand vertical loads.

It is explanatory drawing which shows the outline of a structure of the support part vicinity of the seismic isolation building concerning this Embodiment. It is explanatory drawing which shows a mode that the upper structure moved and the stopper member and the base part collided.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing an outline of the configuration in the vicinity of the support portion of the base-isolated building 1 according to the present embodiment.

  The seismic isolation building 1 is a low-rise (2 to 3) industrialized house with a steel frame, ALC panel outer wall, and floor, for example, an upper structure 2, a lower structure 3, and a sliding bearing. A type seismic isolation device 4 is provided.

  The upper structure 2 is a steel frame ramen structure in which, for example, a column 10 and a large beam on each floor including a foundation beam 11 (a beam that supports the first floor) are rigidly joined.

  The column 10 is made of, for example, a rectangular steel pipe and is configured as a through column that is appropriately joined at an intermediate portion.

  The large beams on each floor including the foundation beam 11 are made of, for example, H-shaped steel, and an end plate serving as a joint portion with the column 10 is welded in the middle thereof. The column 10 and the foundation beam 11 are rigidly joined with high-strength bolts, for example, with the positions of the respective bolt holes being matched. The lower end portion of the column 10 slightly protrudes from the lower surface of the lower flange of the foundation beam 11, and a slip material 12 described later is fixed to the lower end surface.

  An outer wall panel made of lightweight cellular concrete (ALC) is connected to the outer peripheral portion of the upper structure 2 to form an outer wall. The floor of each floor is configured, for example, by placing a floor panel made of ALC on the upper surface of the upper flange of each beam.

  The lower structure 3 includes a pressure plate 20 made of a rigid body, a deformation layer 21 made of an elastic body formed on the upper surface of the pressure plate 20, and a pedestal portion 22 made of a rigid body provided on the upper surface of the deformation layer 21. ing.

  The pressure platen 20 has a function of supporting the load of the upper structure 2 and transmitting it to the ground surface, and is, for example, a reinforced concrete slab shape.

  The deformation layer 21 has a function of displacing the pedestal portion 22 according to the applied horizontal force and a function of restoring the pedestal portion 22 to the original position when the horizontal force is removed. (Laminated) Made of rubber. The upper surface and the lower surface of the deformation layer 21 are fixed to the upper surface of the pressure platen 20 and the lower surface of the pedestal part 22 so that no slip occurs. The fixing method may be adhesion, engagement of unevenness, bolting, or the like. The deformation layer 21 has the same area as the pedestal portion 22.

  The pedestal portion 22 is a portion on which the sliding plate 23 is placed and fixed, and is made of, for example, a thick rectangular plate-shaped reinforced concrete. The pedestal part 22 is constructed by installing the deformable layer 21 at a predetermined position after the pressure-resistant board 20 is constructed, standing a mold frame around it, and placing ready-mixed concrete. The pedestal portion 22 may be a PC plate, a metal plate, or the like.

  The seismic isolation device 4 is a sliding support type, and includes, for example, a supporting member including a sliding member 12 and a sliding plate 23, a stopper member 30, a restoring member (not shown), a damping member (not shown), and the like.

  The sliding member 12 is attached to the lower end portion of the column 10 of the upper structure 2 as described above, and slides on the upper surface while following the displacement of the upper structure 2 and in contact with the upper surface of the sliding plate 23. It is. The sliding material 12 is made of, for example, polyamide, PTFE (fluororesin), or the like.

  The sliding plate 23 is a surface on which the sliding member 12 slides, and is placed and fixed on the upper surface of the base portion 22 of the lower structure 3. The sliding plate 23 has a sufficient area with respect to the sliding material 12 so that the sliding material 12 can slide. The sliding resistance of the sliding plate 23 is adjusted so that its upper surface (sliding surface) starts to slide by a predetermined horizontal force.

  The stopper member 30 limits the displacement of the upper structure 2 when a horizontal force is applied, and is positioned below the upper surface of the pedestal portion 22 at a position that is a predetermined distance D away from the pedestal portion 22 at the reference position in the horizontal direction. It is fixed to the lower flange lower surface of the foundation beam 11 with bolts so as to protrude. Accordingly, when the upper structure 2 is displaced relative to the lower structure 3 by a predetermined distance D in the horizontal direction, the pedestal 22 collides with the stopper member 30 and the movement of the upper structure 2 is restricted.

  The restoring member (not shown) has a function of restoring the upper structure 2 that is relatively displaced when the horizontal force is applied to the original position, and is made of, for example, laminated rubber. The damping member (not shown) has a function of attenuating relative shaking of the upper structure 2 when a horizontal force is applied, and is made of, for example, an oil damper.

  In the base-isolated building 1 configured as described above, first, when a horizontal force smaller than the frictional force between the sliding member 12 and the sliding plate 23 is applied to the base-isolating building 1, the deformed layer of the lower structure 3 first. 21 undergoes shear deformation (deformation in the horizontal direction). Thereafter, when the horizontal force becomes larger than the frictional force between the sliding member 12 and the sliding plate 23, the sliding member 12 starts to slide on the sliding plate 23. Thus, when a horizontal force is applied due to an earthquake or the like, the upper structure 2 behaves smoothly with respect to the lower structure 3.

  When the upper structure 2 is displaced relative to the lower structure 3 in the horizontal direction by a predetermined distance D, the stopper member 30 collides with the side surface of the pedestal portion 22 and the displacement of the upper structure 2 is restricted. .

  According to the above embodiment, the deformation layer 21 is provided on the upper surface of the pressure plate 20 of the lower structure 3, and the pedestal portion 22 made of a rigid body is provided on the upper surface of the deformation layer 21, on the pedestal portion 22. Since the slip plate 23 is provided, when the horizontal force is applied, the deformation layer 21 is deformed and the seismic isolation building 1 behaves smoothly. Moreover, since the deformation layer 21 is provided on the lower structure 3 side where the sliding plate 23 having a larger area than the sliding material 12 is provided, the deformation layer 21 is less likely to be restricted by the area. As a result, even when the sliding member 12 is installed at the lower end of the column 10 having a lighter and smaller cross-sectional area, the support portion of the seismic isolation building 1 can sufficiently withstand the vertical load of the upper structure 2. obtain. Further, depending on the tuning of the deformation layer 21, it is possible to exert an effect on environmental vibration such as traffic vibration.

  The upper structure 2 is provided with a stopper member 30 that collides with the pedestal portion 22 when the upper structure 2 moves relative to the lower structure 3 in the horizontal direction by a predetermined distance D. The maximum displacement of the upper structure 2 can be limited. In addition, since the lower structure 3 has the deformation layer 21 made of an elastic body, it is possible to mitigate the impact when the stopper member 30 collides with the base portion 22.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

DESCRIPTION OF SYMBOLS 1 Seismic isolation building 2 Upper structure 3 Lower structure 4 Seismic isolation device 12 Sliding material 20 Pressure-resistant board 21 Deformable layer 22 Base part 23 Slip board 30 Stopper member

Claims (2)

It is a seismic isolation building equipped with a sliding support type seismic isolation device with a sliding material in the upper structure and a sliding plate in the lower structure,
The lower structure has a pressure-resistant plate made of a rigid body, a deformation layer made of an elastic body provided on the upper surface of the pressure-resistant plate, and a pedestal portion made of a rigid body provided on the upper surface of the deformation layer,
The sliding material is installed at the lower end of the column of the upper structure,
The said base plate is installed on the said base part, The seismic isolation building characterized by the above-mentioned.   2. The stopper according to claim 1, wherein the upper structure is provided with a stopper member that collides with the pedestal when the upper structure moves a predetermined distance in the horizontal direction with respect to the lower structure. The listed base-isolated building.

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