JP2016003534A - Building damping structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attenuation structure of a building having a seismic isolator, which has a simple structure but can apply attenuation force even to great distortion.SOLUTION: The attenuation structure of a building whose upper structure is supported by a substructure via a seismic isolator includes: a projection disposed below the upper structure; and a resistance element which comes into contact with the projection within a movable range of the seismic isolator; the resistance element being an improved ground body containing an elastic body and a fibrous member.

Description

  The present invention relates to a building damping structure, and more particularly to a building damping structure having a seismic isolation device.

  Conventionally, in a base-isolated building having a base-isolator (isolator), a damping force such as viscous damping or friction damping has been applied as a measure for suppressing horizontal displacement during an earthquake or the like. Such a damping force is generally applied by a damping device such as an oil damper or a friction damper, or a frictional force of a sliding bearing that also functions as a vertical support device, but it is simpler to apply the damping force. As a simple method, there is a method using a ground material such as foamed resin or sand as a resistance element.

  Patent Document 1 discloses a configuration in which the ground itself made of a ground material is used as a resistance element for applying a damping force. Specifically, Patent Document 1 discloses a stopper that supports the weight of a structure by placing a sliding-type seismic isolation bearing directly on the foundation footing of the foundation, and protrudes into the ground on the bottom surface of the structure to come into contact with the ground. The structure which provided the protrusion for operation is disclosed. In Patent Document 1, the surface ground around the protrusion is improved by mixing and stirring a cement-based solidifying material, or by injecting a chemical such as a solidifying agent into the ground. Increasing power is disclosed.

JP-A-2005-29956

  However, since the ground material tends to exhibit brittle characteristics when the deformation increases, the ground or the improved ground disclosed in Patent Document 1 has a performance as a resistance element for obtaining a damping force when the deformation increases. May decrease.

  The objective of this invention is providing the damping structure of the building which has a seismic isolation apparatus which can provide damping force also with respect to a big deformation | transformation while being a simple structure.

  A building damping structure according to a first aspect of the present invention is a building damping structure in which an upper structure is supported by a lower structure via a seismic isolation device, and is provided at a lower portion of the upper structure. And a resistance element that contacts the projection within a movable range of the seismic isolation device, wherein the resistance element is an improved ground body including an elastic body and a fibrous member. To do.

  As one embodiment of the present invention, the protrusion is preferably a cylindrical steel pipe in which a hollow portion is filled with a non-shrink grout material.

  As one embodiment of the present invention, the improved ground body is filled in a space defined by a frame portion formed in the lower structure, and the inner wall of the frame portion protrudes toward the space side, and at least It is preferable that a protrusion part of which is partially embedded in the improved ground body is formed.

  As one embodiment of the present invention, it is preferable that the protruding portion is embedded in the improved ground body so as to come into contact with the improved ground body when the seismic isolation device is in a non-operating state.

  ADVANTAGE OF THE INVENTION According to this invention, it is a simple structure and can provide the damping structure of the building which has a seismic isolation apparatus which can provide damping force with respect to a big deformation | transformation.

It is a figure which shows the whole structure of the building to which the damping structure as one Embodiment of this invention is applied. It is a figure which shows the detail of the seismic isolation apparatus and damping device of the building of FIG.

  Hereinafter, as one embodiment of the building damping structure according to the present invention, the damping structure of the building 1 in which the seismic isolation device C is interposed between the upper structure A and the lower structure B will be described with reference to FIGS. Will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the common member in each figure.

  FIG. 1 is a diagram illustrating an overall configuration of a building 1. As shown in FIG. 1, the building 1 includes an upper structure A, a lower structure B, a sliding support type seismic isolation device (isolator) C, and an attenuation device D. FIG. 2 is a diagram showing details of the seismic isolation device C and the attenuation device D. In FIG. 1, for the sake of convenience, the upper structure A, the lower structure B, the seismic isolation device C, and the attenuation device D are each schematically shown so that the entire configuration of the building 1 can be easily understood.

  The upper structure A is supported by the lower structure B via the seismic isolation device C. By interposing the seismic isolation device C between the upper structure A and the lower structure B, for example, at the time of an earthquake, the earthquake energy input to the upper structure A from the ground G through the lower structure B can be reduced. it can. Moreover, since the building 1 has the attenuation device D in addition to the seismic isolation device C, the response (response displacement and the like) of the upper structure A can also be suppressed during an earthquake or the like.

  First, the whole structure of the building 1 is demonstrated with reference to FIG. 1, FIG. The building 1 is a two-layered house, and in the first and second layers, a living room where a resident lives, a dining room, a kitchen, a bedroom, a room for water, etc. are formed (not shown). . Further, as the structure type, the upper structure A composed of the pillar 11, the large beam 12, the cantilever 13, the nose tip beam 14, the small beam (not shown), etc. is a steel structure, and is composed of the foundation 21 and the like. The lower structure B is reinforced concrete. Between the upper structure A and the lower structure B, a sliding support type seismic isolation device C and an attenuation device D are provided.

  The column 11 of the upper structure A is composed of a square steel pipe that is seamless (has no seams in the horizontal cross section). Bolt holes are drilled at predetermined positions on the side surfaces of the pillars 11 to form beam joints 11a to which large beams 12 to be described later are joined. Further, a slide bearing 31 (see FIG. 2) constituting a seismic isolation device C described later is formed integrally with the column 11 at the lower end portion of the column 11.

  The large beam 12 connecting the adjacent columns 11 is made of H-shaped steel, and bolt holes are formed at both ends of the H-shaped steel at positions corresponding to the bolt holes formed in the beam joint portion 11a of the column 11. The joining plate 12a is welded. And the pillar 11 and the big beam 12 are joined by rigidly joining the beam junction part 11a and the joining plate 12a (refer FIG. 2) with a high strength volt | bolt.

  The cantilever 13 joined by the joining method similar to the above-mentioned large beam 12 is arrange | positioned at the side surface of the outer side direction of the building 10 where the large beam 12 is not joined among the beam junction parts 11a of the pillar 11. Specifically, the cantilever 13 is made of H-shaped steel, and at one end thereof, a joining plate 13a (see FIG. 5) having a bolt hole drilled at a position corresponding to the bolt hole formed in the beam joint 11a of the column 11. 2) is welded. The cantilever beam 13 is supported by the column 11 by the beam joint 11a and the joint plate 13a being rigidly joined by a high-strength bolt.

  At the tip end side of the cantilever beam 13, a nose tip beam 14 made of H-shaped steel that connects the tip ends of adjacent cantilever beams 13 is attached. A flange (not shown) for supporting and positioning the outer wall panel is attached to the flange of the nose tip beam 14, and the outer wall panel 16a made of an ALC (lightweight cellular concrete) panel is fixed by this bracket to constitute the outer wall 16. Has been.

  A small beam (not shown) is appropriately bridged between the opposing large beams 12, and a floor panel 17a made of an ALC panel is supported by the large beams 12 and the small beams to form a floor 17 (see FIG. 2). ).

  The cantilever beam 13, the nose tip beam 14 and the small beam are all made of H-shaped steel having the same beam width and width as the large beam 12, and the web and flange have a pitch based on the module and the joint hardware and column of other beams A bolt hole for attaching a metal fitting or the like of the outer wall panel is formed.

  The foundation 21 of the lower structure B is a solid foundation, and includes a pressure-resistant panel 21a, a seismic isolation device fixing portion 21b that rises vertically upward from the pressure-resistant panel 21a, and a seismic isolation device C to be described later is fixed on the upper surface thereof. And a frame portion 21c that rises upward in the vertical direction from the pressure platen 21a and divides a space filled with an improved ground body 42 of the damping device D described later. The lower structure B is provided on the ground G, and the lower structure B including the foundation 21 moves integrally following the movement of the ground G during an earthquake.

  The inner wall of the frame portion 21c of the present embodiment is formed with a protruding portion 22 (see FIG. 2) that protrudes toward the space defined by the frame portion 21c and at least a portion of which is embedded in an improved ground body 42 described later. Yes. The protrusion 22 can be a rod-shaped steel material such as a bolt, for example, which is fixed by being embedded in the frame 21c at one end. In this embodiment, a plurality of protrusions 22 are formed by arranging a plurality of M12 (JIS standard) bolts at a pitch of 100 mm.

  The seismic isolation device C is a sliding support type, and is fixed to a sliding support 31 integrally formed at the lower end portion of the column 11 of the upper structure A and a seismic isolation device fixing portion 21b of the foundation 21 of the lower structure B. Receiving plate 32. The receiving plate 32 is a surface that slides the sliding surface (lower surface) of the sliding support 31, and the sliding surface of the sliding support 31 does not protrude from the receiving plate 32 even when the upper structure A is displaced to the maximum. It is configured as follows. The sliding surface of the sliding bearing 31 and the sliding surface (upper surface) of the receiving plate 32 are coated with a fluororesin so as to be smoothly displaced during an earthquake.

  The damping device D includes a projecting portion 41 provided at the lower portion of the upper structure A, and a resistance element that comes into contact with the projecting portion 41 within the movable range of the seismic isolation device C. And an improved ground body 42 including a fibrous member. The “movable range of the seismic isolation device” in this embodiment means a range in which the seismic isolation device (isolator) can be displaced or deformed in the horizontal direction while supporting the vertical load of the upper structure. In the embodiment, it refers to a range in which the sliding support 31 can move while sliding on the receiving plate 32 in the horizontal direction.

  The projecting portion 41 of the present embodiment is formed of a cylindrical steel pipe in which a hollow portion is filled with a cement-based non-shrink grout material 43, and is a girder arranged at the floor level of the first layer of the upper structure A. 12 is bolted to the lower flange. Instead of or in addition to the large beam 12, the protruding portion 41 may be joined to a lower flange of another beam such as a small beam arranged at the floor level of the first layer of the upper structure A.

  The improved ground body 42 as a resistance element is a composite material in which mud and cement are mixed with a rubber chip as an elastic body and a resinous fibrous member having toughness. Attenuation performance and restoration performance can be enhanced by mixing rubber chips. Moreover, since the toughness of the composite material as a whole can be increased by mixing the fibrous member, it is difficult to cause brittle fracture even for a large amount of deformation, and deformation followability can be improved. In addition, since the brittle fracture is difficult, the function as the resistance element is unlikely to deteriorate even when the protruding portion 41 and the improved ground body 42 repeatedly collide (contact) such as a plurality of earthquakes. Therefore, a durable resistance element can be realized.

  The improved ground body 42 is filled in the space defined by the frame portion 21c of the foundation 21, and at least the tip of the protruding portion 41 described above is buried in the improved ground body 42 in the concave portion 21c. Yes. In other words, the improved ground body 42 of the present embodiment is filled in the space of the frame portion 21c so that the seismic isolation device C is in contact with the protruding portion 41 in a non-operating state. Therefore, for example, when an earthquake occurs and slip occurs between the slide support 31 and the receiving plate 32 and the upper structure A moves in the horizontal direction with respect to the lower structure B, the upper structure is simultaneously with the start of the movement. The protrusion 41 fixed to the body A presses the modified ground body 42 held by the lower structure B so as to deform it. At this time, since the improved ground body 42 serves as a resistance element of the protruding portion 41, the horizontal displacement of the upper structure A can be reduced.

  Here, since the protruding portion 22 described above is provided on the inner wall of the frame portion 21c, when the protruding portion 41 is pressed against the improved ground body 42, compared to a configuration without the protruding portion 22. The shape of the improved ground body 42 in the space of the frame portion 21c can be maintained, and the function of the improved ground body 42 as a resistance element can be enhanced. Specifically, since the protrusion 22 is buried in the improved ground body 42, the integrity of the entire improved ground body 42 can be further improved through the fibrous member in the improved ground body 42. The restoration function and the attenuation function of the ground body 42 can be improved.

  In addition, the protrusion part 22 formed in the inner wall of the frame part 21c is arrange | positioned so that it may not contact the protrusion part 41, when the upper structure A is displaced to the maximum. Further, the protrusion 22 may be formed on the upper surface of the pressure platen 20a in addition to or instead of the inner wall of the frame 21c. Further, in consideration of the fact that the upper structure A moves in any horizontal direction, the protrusions 22 are provided at a predetermined pitch on the inner wall of the frame portion 21c so as to surround the periphery of the improved ground body 42 in the horizontal direction. It is preferable to be provided. Furthermore, although the protrusion part 22 of this embodiment is comprised by rod-shaped steel materials, such as a volt | bolt which protrudes from the inner wall of the frame part 21c, it is not restricted to this structure, For example, the inner wall itself of the frame part 21c, The protrusion 22 may be formed by providing an uneven shape on the upper surface of the pressure platen 20a.

  Further, as described above, the projecting portion 41 of the present embodiment has an improved ground body so as to come into contact with the improved ground body 42 when the seismic isolation device C is in a non-operating state (a state where the seismic isolation device C is in a steady position). Although it is embedded in 42, it is not restricted to such a structure. For example, in the non-operating state of the seismic isolation device, a gap is formed between the projecting portion and the improved ground body, and is in a non-contact state, after the operation of the seismic isolation device, that is, after the movement of the upper structure, It is good also as a structure which both contact for the first time. However, if the projecting portion 41 and the improved ground body 42 are already in contact with each other in the non-operating state of the seismic isolation device C as in the present embodiment, for example, even for fine vibration from the ground G The projecting portion 41 and the improved ground body 42 can function as the attenuation device D.

  Moreover, although the protrusion part 41 of this embodiment is comprised with the cylindrical steel pipe which has the bottom plate in the lower side by which the non-shrinking grout material 43 was filled in the hollow part, the upper structure A is the lower structure B. As long as it has rigidity to the extent that the improved ground body 42 is deformed when moving in the horizontal direction, the structure is not limited to the above. Therefore, for example, it is possible to form the protruding portion with a solid cylindrical steel material. However, as in the present embodiment, if the projecting portion 41 is configured by a cylindrical steel pipe in which the hollow portion is filled with the non-shrink grout material 43, the projecting portion is configured by a solid columnar steel material. Thus, it is possible to reduce the weight and the cost while maintaining the strength to the extent that the improved ground body 42 is deformed.

  As described above, the upper structure A according to the present embodiment is a steel structure including the pillars 11 and the large beams 12, but is not limited thereto, and may be a wooden structure or a reinforced concrete structure, for example. In addition, it is not limited to a ramen structure. For example, a light-weight column and beam with a relatively small cross section are connected to a pin, and a seismic wall or brace is placed at the required location of the frame to act in the event of an earthquake. A pin brace structure or the like that resists external force may also be used. Furthermore, the lower part of the upper structure A of the present embodiment is constituted by the lower end of the pillar 11 and beams such as the large beam 12 arranged at the floor level of the first layer. It is good also as a structure which further provides the foundation of a structure or a reinforced concrete structure. In such a configuration, the support of the seismic isolation device C and the protruding portion of the damping device D may be fixed to the foundation beam of the foundation.

  Moreover, in this embodiment, although the frame part 21c of the lower structure B is integrally formed with the foundation 21, the separate annular frame body comprised with the steel frame or the reinforced concrete is provided with respect to the foundation 21 of a reinforced concrete structure. The frame portion of the lower structure B may be formed by embedding.

  The seismic isolation device C of the present embodiment is a sliding support type, but is not limited to this, and can be a rolling support type using a ball bearing or the like, for example. Further, in order to enhance the restoration function of the seismic isolation device C, restoration rubber or the like can be used in combination.

  Although the damping device D of this embodiment is the structure provided with the protrusion part 41 and the improved ground body 42 as its resistance element, in addition to this, it is also possible to provide an oil damper etc. and to further improve damping performance. .

  The present invention relates to a building damping structure, and more particularly to a building damping structure having a seismic isolation device.

A: Upper structure B: Lower structure C: Seismic isolation device (isolator)
D: Damping device G: Ground 1: Building 11: Column 11a: Beam joint 12: Large beam 12a: Joint plate 13: Cantilever 13a: Joint plate 14: Nose beam 16: Outer wall 16a: Outer panel 17: Floor 17a: Floor panel 21: Foundation 21a: Pressure-resistant panel 21b: Seismic isolation device fixing part 21c: Frame part 22: Protruding part 31: Sliding support 32: Receiving plate 41: Protruding part 42: Improved ground body (resistance element)
43: Grout wood

Claims (4)

A building damping structure in which the upper structure is supported by the lower structure via a seismic isolation device,
A protrusion provided at a lower portion of the upper structure;
A resistance element that comes into contact with the protrusion within a movable range of the seismic isolation device,
The building damping structure according to claim 1, wherein the resistance element is an improved ground body including an elastic body and a fibrous member.   2. The building damping structure according to claim 1, wherein the projecting portion is a cylindrical steel pipe in which a hollow portion is filled with a non-shrink grout material. The improved ground body is filled in a space defined by a frame portion formed in the lower structure,
3. The building attenuation structure according to claim 1, wherein the inner wall of the frame part is formed with a protruding part that protrudes toward the space and at least a part of which is embedded in the improved ground body.   The said protrusion part is embedded in the said improved ground body so that the said seismic isolation device may contact with the said improved ground body in the non-operating state, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. Damping structure of the building as described in.

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