JP2008274622A - Intermediate-story base-isolating mechanism of building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intermediate-story base-isolating mechanism of a building, which enables a damper to be mounted without a great deterioration in the habitability of a base-isolating device-installed floor, regardless of a structure of the building. <P>SOLUTION: This intermediate-story base-isolating mechanism of the building comprises: a base-isolating support device 4 which is inserted into a column 3 so as to base-isolate and support an upper structure 1 of the building; a vertical reaction portion 6 which is provided toward the upper structure 1 from a lower structure 2 formed below the base-isolating support device 4; a horizontal reaction portion 7 for connecting the vertical reaction portion 6 to a section of the column 3 below the base-isolating support device 4; and a viscous damper 8 for horizontally connecting the vertical reaction portion 6 and the upper structure 1 together so as to attenuate vibrations of the upper structure 1 during earthquakes. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an intermediate floor seismic isolation mechanism for a building capable of maintaining the habitability on the installation floor of a seismic isolation device including a seismic isolation bearing device and a viscous damper.

An intermediate-floor seismic isolation system, in which a seismic isolation support device is inserted into a pillar on the middle floor of a building and the upper part of the building is isolated, has been adopted for seismic isolation of the building. In the retrofit seismic isolation system, which isolates existing buildings, the middle floor seismic isolation system is frequently used. In the middle floor seismic isolation, in addition to the seismic isolation support device, a damper for damping the vibration is provided. The damper receives the inertial force of the building during an earthquake and generates a damping force. In order to secure the reaction force against the damping force, the building is provided with a reaction force portion using columns and beams. In Patent Document 1, a structure of a reaction force portion is shown as a stud erected from the lower side of a rectangular main frame constructed by a pillar member and a beam member.
JP 09-324557 A

  The studs of Patent Document 1 are required to have the rigidity of the joint with the lower beam member and the bending rigidity of the member itself. In order to ensure these rigidity, in patent document 1, providing the diagonal material which connects the top part of a stud, and a lower side beam member is shown. However, if diagonal members are provided from the lower beam members (floor slabs), the flow lines on the seismic isolation device installation floor are divided and the comfortability is lowered. On the other hand, in order to secure the reaction force with only the studs without providing diagonal members, it is necessary to secure the bending rigidity and the rigidity of the joint portion of the lower beam member with the studs themselves, and the studs become a large member. End up. In addition, it is difficult to add rigidly connected studs to the lower beam members of existing buildings by post-construction, and it is difficult to provide studs in retrofit seismic isolation. In particular, for existing lower beam materials that use steel frames, the steel frame in the beam becomes an obstacle, so it is difficult to make a rigid connection because only the upper surface of the beam is connected to the studs. there were. For this reason, in retrofit seismic isolation, in order to reinforce the studs, it was necessary to provide diagonal materials from the lower beam members, and the habitability on the seismic isolation device installation floor was often reduced.

  Furthermore, considering the structural balance of the building, it is preferable that the center position of the damping force and the center of gravity position of the building be close to each other on the floor where the seismic isolation device is installed. For this reason, it is better that there is no restriction on the installation position of the studs so that the installation position of the viscous damper is not restricted. However, in order to ensure the rigidity of the joint portion between the stud and the existing building, it is necessary to secure the rigidity of the member itself for installing the stud, and it cannot be installed on the floor slab.

  The present invention was devised in view of the above-described conventional problems, and is an intermediate floor of a building in which a damper can be attached without greatly impairing the habitability of the seismic isolation device installation floor regardless of the structure of the building. The purpose is to provide a seismic isolation mechanism.

  An intermediate floor seismic isolation mechanism according to the present invention includes a seismic isolation device inserted in a column for isolating and supporting an upper structure of a building, and a lower structure formed below the seismic isolation device. A vertical reaction force portion provided toward the upper structure, a lateral reaction force portion connecting the vertical reaction force portion and the portion of the column below the seismic isolation bearing device, and an earthquake of the upper structure In order to dampen the vibration, the longitudinal reaction force portion and the upper structure body are provided with a viscous damper for connecting in the lateral direction.

  The longitudinal reaction force portion is pin-bonded to the lower structure.

  The longitudinal reaction force portion is provided from a steel-framed or steel-framed reinforced concrete beam.

  The longitudinal reaction force portion is provided from a floor slab of a lower structure.

  According to the present invention, the intermediate floor seismic isolation mechanism of a building can be installed with a damper without greatly impairing the habitability of the seismic isolation device installation floor regardless of the structure type of the building.

  EMBODIMENT OF THE INVENTION Below, suitable embodiment of the intermediate floor seismic isolation mechanism of the building concerning this invention is described in detail with reference to an accompanying drawing. As shown in FIGS. 1 and 3, the intermediate floor seismic isolation mechanism of the building according to this embodiment is basically a pillar 3 for supporting the upper structure 1 of the building with the lower structure 2. The seismic isolation bearing device 4 inserted into the seismic isolation device, the longitudinal reaction force portion 6 provided from the lower structure 2 to the upper structure 1 formed below the seismic isolation support device 4, The lateral reaction force portion 7 that connects the portion of the column 3 below the seismic support device 4 and the longitudinal reaction force portion 6 and the upper structure 1 are laterally connected to attenuate the vibration of the upper structure 1 during an earthquake. It has the viscous damper 8 connected by.

  The intermediate floor seismic isolation mechanism of the building of the present embodiment is applied to an existing steel-framed reinforced concrete structure (hereinafter referred to as “SRC structure”). The upper structure 1 of the building is supported by the pillar 3 from the lower structure 2. A seismic isolation bearing device 4 is inserted in the middle part of the column 3.

  The upper structure 1 in this embodiment includes a part of a column 3 (hereinafter referred to as “post-column part 3 a”) located immediately above the seismic isolation bearing device 4 and a directly upper floor (seismic isolation support) connected to the column top part 3 a. The beam 9 (hereinafter referred to as “upper beam 9”) of the floor to which the apparatus 4 is attached and the floor slab 10 (hereinafter referred to as “upper floor slab 10”) of the directly upper floor. The upper part 30a of the existing pillar (hereinafter referred to as “upper existing pillar 30a”) and the upper existing pillar reinforcing part 31a which is added to attach the seismic isolation bearing device 4 are configured. The upper existing column reinforcing portion 31a is constructed by assembling reinforcing bars (not shown) around the upper existing column 30a, and placing concrete to expand the cross-sectional area of the upper existing column 30a to increase the installation area of the seismic isolation bearing device 4. In addition to securing, the concrete is placed between the cut surface of the upper existing pillar 30a and the seismic isolation bearing device 4 so as to ensure the integration of the seismic isolation bearing device 4 and the column top portion 3a. . Further, an upper beam reinforcing portion 90 that reinforces the upper beam 9 in order to attach the seismic isolation bearing device 4 is provided in the vicinity of a connection portion between the upper beam 9 and the columnar portion 3a. The upper beam reinforcing portion 90 is provided by placing a reinforcing bar and a PC steel bar (both not shown) around a portion exposed from the bottom of the upper floor slab 10 of the upper beam 9 and placing concrete. In the portion of the upper beam 9 where the upper beam reinforcing portion 90 is applied, the beam width and the beam back are enlarged.

  The lower structure 2 refers to a structure of a building constructed below the seismic isolation support device 4, and in the present embodiment, a portion 3 b (hereinafter referred to as “the pillar 3”) located immediately below the seismic isolation support device 4. A lower column 3b ”, a beam 5 on the floor where the seismic isolation bearing 4 is installed (hereinafter referred to as“ lower beam 5 ”), and a floor slab 11 (hereinafter referred to as“ lower floor ”where the seismic isolation bearing 4 is installed). Slab 11 ”). The lower beam 5 is made of SRC and has a steel frame 5a embedded therein. The lower column portion 3b is composed of a lower portion 30b of the existing column 30 (hereinafter referred to as “lower existing column 30b”) and a lower existing column reinforcing portion 31b that is added to attach the seismic isolation support device 4. The lower existing column reinforcing portion 31b is provided with concrete around the lower existing column 30b to expand the cross-sectional area of the lower existing column 30b to secure the installation area of the seismic isolation bearing device 4 and the lower existing column 30b. It is provided so that the seismic isolation bearing device 4 can be integrated.

  The seismic isolation support device 4 is inserted between the column upper portion 3a and the column lower portion 3b, and constitutes the column 3 integrally with the column upper portion 3a and the column lower portion 3b. The seismic isolation bearing device 4 is inserted into a portion formed by cutting the existing column 30 near the lower portion of the upper beam 9. The seismic isolation support device 4 has a function of supporting the upper structure 1 while reducing the shaking at the time of an earthquake transmitted from the lower structure 2 to the upper structure 1, that is, a seismic isolation support function. I support it. The seismic isolation bearing device 4 of the present embodiment is composed of an upper and lower mounting plates and laminated rubber sandwiched between them. The upper mounting plate of the seismic isolation bearing device 4 is integrated by embedding an anchor in the upper existing column reinforcing portion 31a, and the lower mounting plate is integrated by embedding the anchor in each lower existing column reinforcing portion 31b. Yes. The seismic isolation bearing device 4 of the present embodiment configured with laminated rubber also has a restoration function in the seismic isolation mechanism. The type of seismic isolation bearing device 4 is not limited, and a rolling seismic isolation bearing device or a sliding seismic isolation bearing device may be used.

  The lower structure 2 is provided with a longitudinal reaction force portion 6 toward the upper structure 1. The longitudinal reaction force portion 6 has a function of connecting and supporting the viscous damper 8 to the lower structure 2 and a function of a reaction force portion against a damping force from the viscous damper 8 during an earthquake. The longitudinal reaction force portion 6 is not connected to the upper structure 1 except that it is connected to the upper structure 1 via the viscous damper 8. The longitudinal reaction force portion 6 of the present embodiment is provided from a lower beam 5 made of SRC. The longitudinal reaction force portion 6 is a columnar member made of reinforced concrete, and is raised from the upper surface of the lower beam 5, that is, the lower structure 1, to below the upper beam 9. The reinforcing bar of the vertical reaction force part 6 is composed of a plurality of vertical reinforcing bars 6a and hoop bars (not shown) provided at appropriate intervals. The lower end portion of the vertical bar 6a is connected to a lower connection anchor 12 provided on the upper surface of the lower beam 5. The lower fixed anchor 12 is constituted by a post-installed adhesive anchor or a driven anchor that is driven from the surface of the lower beam 5 to the upper surface of the flange of the steel frame 5a. The lower fixed anchor 12 is difficult to ensure sufficient fixing due to the steel frame 5a in the lower beam 5, and the concrete of the longitudinal reaction force portion 6 is placed on the upper surface of the lower beam 5, so that the longitudinal reaction force portion 6 and The lower beam 5 is not constructed integrally. For this reason, although the horizontal proof stress is ensured by the lower fixed anchor 12 at the joint surface between the lower structure 2 and the longitudinal reaction force portion 6, sufficient proof strength against bending cannot be ensured. For this reason, the joint between the lower structure 2 and the longitudinal reaction force portion 6 is not a rigid joint but is substantially a pin joint. The “pin joint” in the present embodiment includes a case where the joint state is substantially equivalent to the pin joint. Therefore, the longitudinal reaction force portion 6 of this embodiment is pin-bonded to the lower structure 2.

  The longitudinal reaction force portion 6 is provided with a lateral reaction force portion 7 that connects the longitudinal reaction force portion 6 and the column bottom portion 3b. The lateral reaction force portion 7 constitutes a reaction force portion against a damping force that acts on the vertical reaction force portion 6 in the horizontal direction. In principle, the lateral reaction force portion 7 resists the damping force by pulling and compressing in the axial direction. Therefore, the connection between the lateral reaction force portion 7 and the longitudinal reaction force portion 6 and the column lower portion 3b is a rigid connection or a pin. Bonding may be used. In FIG. 2, reaction force and moment diagrams are shown with both ends of the lateral reaction force portion 7 being pin-joined. The lateral reaction force portion 7 in the present embodiment is a reinforced concrete beam-like member constructed integrally with the longitudinal reaction force portion 6 and the column bottom portion 3b as shown in FIG. 3, and its end portion is rigidly joined. ing. The lateral reaction force portion 7 is provided substantially horizontally between the lower column reinforcing portion 31b below the seismic isolation bearing device 4 and the longitudinal reaction force portion 6, and is set to a height that does not hinder the flow of occupants. . The reinforcing bars of the lateral reaction force portion 7 are composed of two upper and lower horizontal bars 7a and stirrup bars (not shown) provided at appropriate intervals. Each end portion of the horizontal reinforcing bar 7a has a fixed fixing length and is embedded in the vertical reaction force portion 6 or the lower existing column reinforcing portion 31b of the column lower portion 3b. Since the transverse reaction force portion 7 is not required to have bending strength in principle, in this embodiment, the transverse reaction force portion 7 is constructed in the shape of a flat beam having a beam width dimension larger than the beam dimension. For this reason, it is easy to ensure the height from the lower floor slab 11 to the lower surface of the lateral reaction force portion 7.

  A viscous damper 8 for connecting the longitudinal reaction force part 6 and the upper structure 1 in the lateral direction is provided on the upper part of the longitudinal reaction force part 6 in order to attenuate vibrations during an earthquake. The viscous damper 8 has a function of absorbing energy at the time of an earthquake and damping the vibration of the upper structure 1. The viscous damper 8 of the present embodiment is an oil damper, and the oil damper is composed of a piston cylinder that generates a damping force with a lateral stroke. The type of the viscous damper 8 is not limited as long as it generates a damping force by horizontal movement. The viscous damper 8 is provided between the side surface of the upper part of the longitudinal reaction force portion 6 and the upper structure 1 in the lateral direction, that is, substantially horizontally. The end of the viscous damper 8 on the side of the longitudinal reaction force portion 6 is pin-connected to a lower damper hardware 16 attached to the side surface of the longitudinal reaction force portion 6. The lower-side damper hardware 16 is fixed to the side surface of the longitudinal reaction force portion 6 by a damper longitudinal reaction force portion anchor 13 embedded in the longitudinal reaction force portion 6 in the lateral direction. The end of the viscous damper 8 on the upper structure 1 side is pin-connected to the upper damper hardware 17 attached to the side surface of the columnar portion 3a, the lower surface of the upper beam reinforcing portion 90, and the intersection. The upper-side damper hardware 17 includes a damper upper column anchor 14 embedded through the upper existing column reinforcing portion 31a in the width direction and a damper upper beam anchor 15 embedded in the upper beam reinforcing portion 90, thereby 3a is fixed in close contact with the two surfaces of the side surface and the lower surface of the upper beam reinforcing portion 90. A damper installation part for attaching the upper damper hardware 17 may be separately formed in the upper structure 1.

  The effect | action of the intermediate seismic isolation mechanism of the building which concerns on this embodiment is demonstrated. First, the construction method of the intermediate seismic isolation mechanism for buildings according to this embodiment will be described. An upper beam reinforcement portion 90 is provided on the upper beam 9 of an existing building of SRC structure, a temporary support column is provided from the lower structure to the lower part of the upper beam reinforcement portion 90, and the vertical load from the upper structure 1 is supported by the temporary support column. Then, the vertical load on the column 3 is released. When the upper beam reinforcing portion 90 is provided, the damper upper beam anchor 15 is embedded in a predetermined position. Then, while restraining the lateral displacement of the upper structure 1 and the lower structure 2 with a temporary member or an existing housing, the existing column 30 is cut off near the lower part of the upper beam 9 to form a part for inserting the seismic isolation bearing device 4 To do. The seismic isolation bearing device 4 is inserted into the cut-out portion of the existing pillar 30 and temporarily fixed, and anchors are provided on the upper and lower mounting plates of the seismic isolation bearing device 4.

  In parallel with the attachment of the anchor, the upper column reinforcing portion 30a is arranged, the end of the horizontal reinforcing bar 7a is inserted into the lower existing column reinforcing portion 31b, and the lateral reaction force portion 7 is arranged, and the lower beam 5 The lower fixed anchor 12 is driven from the upper surface, and the longitudinal reaction force portion 6 such as the longitudinal reinforcement 6a is arranged. After completion of these bar arrangements, the formwork of the upper existing column reinforcement portion 31a is constructed, and the formwork of the longitudinal reaction force portion 6, the lateral reaction force portion 7 and the lower existing column reinforcement portion 31b is constructed integrally. Using the assembled formwork, a damper vertical reaction force anchor 13 and a damper upper column anchor 14 are arranged, concrete is placed in the formwork, and the formwork is disassembled after the concrete is hardened. As a result, the pillar 3 to which the seismic isolation bearing device 4 is integrally attached is constructed, and the lower structure 2 in which the longitudinal reaction force portion 6, the lateral reaction force portion 7, the pillar lower portion 3b, and the lower beam 5 are connected. The reaction force part is constructed.

  Thereafter, the temporary support column is removed and the load of the upper structure 1 is re-supported by the column 3, and then the displacement of the seismic isolation bearing device 4 is temporarily restrained. Next, the lower damper hardware 16 and the upper damper hardware 17 are attached. The lower-side damper hardware 16 is attached to the side surface of the longitudinal reaction force portion 6 by using a damper longitudinal reaction force portion anchor 13. The upper-side damper hardware 17 is attached to the intersection of the column upper portion 3 a and the upper beam reinforcing portion 90 by using the damper upper column anchor 14 and the damper upper beam anchor 15. The viscous damper 8 is attached to the lower and upper damper hardware 16 and 17 attached by pin connection. Finally, the temporary restraint of the seismic isolation bearing device 4 is released, and the intermediate seismic isolation mechanism for the building is completed.

  The effect | action of the intermediate seismic isolation mechanism of the building which concerns on this embodiment is demonstrated. A damping force is generated in the viscous damper 8 due to the inertial force from the upper structure 1 due to the earthquake. The damping force acts on the longitudinal reaction force portion 6 from the viscous damper 8 in the horizontal direction. The reaction force portion of the lower structure 2 formed by the longitudinal reaction force portion 6, the lateral reaction force portion 7, and the lower column portion 3b resists the damping force. Mainly, the lateral reaction force portion 7 connected to the longitudinal reaction force member 6 resists the damping force by compression and pulling, and the longitudinal reaction force portion 6 also bears a horizontal force at the connection portion with the lower beam 5. Since the connection portion of the longitudinal reaction force portion 6 with the lower beam 5 is pin-joined, the attachment position of the longitudinal reaction force portion 6 is maintained and only the vertical load of the viscous damper 8 and a slight horizontal force are borne. Since the lateral reaction force portion 7 has a simple structure that bears an axial force, the member can be simplified. Furthermore, by making the connection point between the lateral reaction force portion 7 and the longitudinal reaction force portion 6 approach the connection point between the viscous damper 8 and the longitudinal reaction force portion 6, the lateral reaction force portion 7 effectively becomes a damping force. It resists and the load of the horizontal force at the lower end of the longitudinal reaction force portion 6 is reduced, and the connection point of the lateral reaction force portion 7 moves upward, and the possibility of obstructing the occupant's flow line is reduced. The longitudinal reaction force portion 6 only needs to have a structure capable of bearing its own bending rigidity and the load of the viscous damper 8, and can be a simple columnar member.

  In the intermediate seismic isolation mechanism of the building according to the present embodiment described above, the seismic isolation bearing device 4 inserted into the column 3 to isolate the upper structure 1 from the seismic isolation, and the seismic isolation bearing device 4 A longitudinal reaction force portion 6 provided from the lower beam 5 of the lower structure 2 formed below to the upper structure 1, a portion 3 b of the column 3 below the longitudinal reaction force portion 6 and the seismic isolation support device 4, And a viscous damper 8 that connects the vertical reaction force portion 6 and the upper structure 1 in the lateral direction in order to damp vibration during the earthquake of the upper structure 1. The reaction force part for countering the damping force from the viscous damper 8 can be constructed with a frame structure made up of relatively simple members, and the vertical reaction force member 6 is simply added to the upper surface of the lower structure 2. It is. Further, the lateral reaction force portion 7 can also be constructed while ensuring the height from the lower floor slab 10. For this reason, it is possible to construct an intermediate floor seismic isolation mechanism that maintains the habitability with less disruption of the user's flow line.

  Since the longitudinal reaction force portion 6 is pin-bonded to the lower beam 5, the structure of the joint portion between the longitudinal reaction force portion 6 and the lower structure 2 is simplified, and the reaction force portion against the damping force is changed to the lower structure 2. It can be easily constructed and an intermediate floor seismic isolation mechanism can be constructed according to the situation of the substructure of the existing building.

  Since the vertical reaction force part 6 can be constructed from the SRC-structured lower beam 5, the reaction force part against the damping force of the viscous damper 8 can be constructed without being restricted by the steel frame of the lower structure 2. The scope of application of seismic isolation mechanisms will be expanded.

  In this embodiment, the longitudinal reaction force portion 6 is provided from the lower beam 5, but the joint between the lower end portion of the longitudinal reaction force portion 6 and the lower structure 2 is part of the load of the horizontal force and the viscous damper 8. Therefore, the longitudinal reaction force portion 6 may be provided from the upper surface of the lower floor slab 11 of the lower structure 2 because the pin connection may be used instead of the rigid connection. Specifically, the lower connecting anchor 12 is driven from the upper surface of the lower floor slab 11 and fixed therein, and the installation position is secured by the lower connecting anchor 12 to construct the longitudinal reaction force portion 6. The lower connecting anchor 12 may be fixed by inserting the lower floor slab 11 through the lower floor slab 11. Accordingly, the vertical reaction force portion 6 can be provided at any upper surface position of the lower structure 2 without being limited to the position of the lower beam 5, and the existing building in which the wall is constructed between the pillars 3. However, the viscous damper 8 can be provided without removing the wall, and application to an existing building becomes easy. Moreover, without being restricted by the upper beam 9, the viscous damper 8 can be attached at a high position from the floor surface, and the attachment position of the lateral reaction force portion 7 can also be installed at a high position from the floor surface of the lower floor slab 11. For this reason, it becomes easy to maintain habitability.

  In the present embodiment, the viscous damper 8 and the lateral reaction force portion 7 are provided only in the longitudinal reaction force portion 6 and the column 3 on one side. However, as shown in FIG. You may provide them also between the parts 3b. Thereby, since the damping force can be simultaneously resisted by the compression and tension of the lateral reaction force portions 7 on both sides of the longitudinal reaction force portion 6, each lateral reaction force member 7 can be simplified. Further, although one vertical reaction force portion 6 is installed between the pillars 3, two vertical reaction force portions 6 may be installed between the pillars 3 and connected to the adjacent column lower portion 3 b by each vertical reaction force portion 6. You may connect the reaction force part 6 and connect with both the pillar lower part 3b or one pillar lower part 3b.

  In the present embodiment, the longitudinal reaction force portion 6 and the lateral reaction force portion 7 are reinforced concrete structures, but they may be composed of precast concrete members or steel frames. As a result, the work of formwork, reinforcement, and concrete placement on site can be reduced, and the middle floor seismic isolation work can be facilitated while using existing buildings.

Although the building in the present embodiment is an existing building, it may be applied to a newly built building.
Moreover, the structural form of the building of this embodiment is not limited to a steel frame reinforced concrete structure, and may be a steel frame structure or a reinforced concrete structure. Moreover, only the lower beam 9 may be constructed with a steel structure or a reinforced concrete structure.

  In the present embodiment, the upper and lower existing column reinforcing portions 31a and 31b, the longitudinal reaction force portion 6 and the lateral reaction force portion 7 are constructed in parallel. However, the construction procedure is not limited to this. You may build ahead. For example, the upper and lower existing column reinforcing portions 31a and 31b may be constructed first, and then the longitudinal reaction force portion 6 and the lateral reaction force portion 7 may be constructed together.

  In this embodiment, after the upper structure 1 is re-supported by the pillar 3, the seismic isolation support device 4 is temporarily restrained. However, the temporary restraint may be performed before the pillar 3 is re-supported. Further, the temporary support column may be removed after the viscous damper 8 is attached.

It is a figure explaining the main components in one suitable embodiment of the middle floor seismic isolation mechanism of the building concerning the present invention. It is a figure explaining the relationship between the damping force in the intermediate floor seismic isolation mechanism shown in FIG. 1, and the reaction force which generate | occur | produces in the main structure part. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevation view illustrating a preferred embodiment of an intermediate floor seismic isolation mechanism for a building according to the present invention. It is an elevation view which shows the suitable modification of the intermediate floor seismic isolation mechanism of the building concerning this invention.

Explanation of symbols

1 Upper structure 2 Lower structure 3 Pillar 4 Seismic isolation device 5 Beam (lower beam)
6 Longitudinal reaction force part 7 Lateral reaction force part 8 Viscous damper

Claims (4)

A seismic isolation device inserted in the column to support the seismic isolation of the superstructure of the building;
A longitudinal reaction force portion provided from the lower structure formed below the seismic isolation bearing device toward the upper structure;
A lateral reaction force part connecting the longitudinal reaction force part and the part of the column below the seismic isolation bearing device;
An intermediate floor seismic isolation mechanism for a building, comprising: a viscous damper that connects the longitudinal reaction force portion and the upper structure in a lateral direction in order to attenuate vibrations of the upper structure during an earthquake.   The said floor reaction force part is pin-joined to the said lower structure, The intermediate floor seismic isolation mechanism of the building of Claim 1 characterized by the above-mentioned.   The intermediate floor seismic isolation mechanism for a building according to claim 2, wherein the longitudinal reaction force portion is provided from a steel-framed or steel-framed reinforced concrete beam.   The said floor reaction force part is provided from the floor slab of the lower structure, The intermediate floor seismic isolation mechanism of the building of Claim 2 characterized by the above-mentioned.

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