JP2000345734A - Vibration isolation building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sufficient vibration isolation effect while ensuring and improving structural safety and habitability by installing vibration isolation devices to each of the lower position of a column base for an upper structure and the lower position of a floor beam connecting a section between the column bases. SOLUTION: Vibration isolation devices 30... composed of orthogonal rail type vibration isolation isolators are mounted to each of the lower positions of column bases for the columns 13... of an upper structure 10. Vibration isolation devices 40, 40 comprising a laminated rubber having a secondary form factor of 3 or less are set up to each of the lower positions of floor beams 11 connecting sections among the column bases. A plurality of the vibration isolation devices 40 are fitted at the lower position of at least one floor beam 11 in the floor beams 11. Accordingly, column base 13 axial force is supported effectively by the vibration isolation devices 30 installed at the lower positions of the column bases 13, and vibrations are damped effectively by the vibration isolation devices 40 mounted at the lower positions of the floor beams 11. Thus, a sufficient vibration isolation effect is obtained while structural safety and habitability can be ensured and improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base-isolated building, and more particularly to a base-isolated building such as a detached house.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. Sho 60 (1994) discloses a seismically isolated building whose upper structure is seismically isolated from the ground (foundation) side by a seismic isolation device.
As disclosed in Japanese Patent Application Laid-Open No. 211142/1998 and Japanese Patent Application Laid-Open No. 10-88849, a seismic isolation device using laminated rubber or the like having a vibration damping ability and a restoring force, and a rolling type isolation device exclusively supporting the load of the upper structure. BACKGROUND ART A seismic isolation building using a seismic device or a sliding seismic isolation device such as an orthogonal rail type seismic isolator is known.

In the seismic isolation building described above, the upper structure can be displaced relative to the ground side, and the seismic energy is absorbed by the relative displacement between the upper structure and the ground side to increase the seismic energy. Acting on the structure can be avoided, and vibration is attenuated by the seismic isolation device made of laminated rubber and the like, and a restoring force is given to the relative displacement between the upper structure and the ground side. It is possible to avoid occurrence of a deviation from the ground side.

[0004]

By the way, seismically isolated buildings,
In particular, in a seismic isolation building that uses both a seismic isolation device made of laminated rubber and a rolling seismic isolation device or a sliding seismic isolation device, each seismic isolation device must be installed at an appropriate position with respect to the superstructure. However, the intended effect cannot be sufficiently obtained, and the structural safety and the livability may be reduced. The present invention has been made in order to solve the above-described problems, and an installation position of each seismic isolation device with respect to an upper structure is selected, and a sufficient seismic isolation effect can be obtained, and structural safety, The purpose is to provide seismically isolated buildings that can secure and improve livability.

[0005]

According to a first aspect of the present invention, there is provided a seismic isolation building according to the present invention, wherein an upper structure is seismically isolated from a ground side by a seismic isolation device. A seismic isolation device is installed at each of a position under the pillar of the body and a position under the floor beam connecting between the column pedestals of the upper structure, and at least one of the floor beams under the floor beam is provided with a plurality of safety devices. It is characterized by having a vibration device. According to this configuration, the seismic isolation device is installed at each of the position below the column pedestal of the upper structure and the position below the floor beam connecting between the column pedestals of the upper structure, and the column is installed by the seismic isolation device installed at the position below the column pedestal. Effectively support leg axis force,
It can be set so that vibration is effectively damped by the seismic isolation device installed below the floor beam.

The seismic isolation building according to the invention of claim 2 is:
The upper structure is seismically isolated from the ground side by the seismic isolation device, and a seismic isolation device having a structure that retains the column base axial force support regardless of the horizontal displacement at the time of seismic isolation is provided under the column base of the upper structure. It is installed and supports the load of the upper structure only when the relative horizontal displacement between the ground side and the upper structure can be regarded as substantially 0 at a position below the floor beam connecting between the column bases of the upper structure. It is characterized by the installation of a seismic isolation device with a structure in which the floor beam bears the load during displacement.

According to this configuration, the seismic isolation device installed under the column base effectively supports the column base axial force regardless of the horizontal displacement at the time of seismic isolation, and the seismic isolation device installed under the floor beam is installed. Only when the relative horizontal displacement between the ground side and the upper structure can be regarded as almost 0 by the device, the load on the upper structure is supported, and at the time of the relative displacement, the load beam is given to the floor beam and can be borne at the column base position, Vibration damping ability can be efficiently provided to the seismic isolation device installed below the floor beam.

[0008] The seismic isolation building according to the third aspect of the present invention is:
The upper structure is seismically isolated from the ground side by a seismic isolation device, and the seismic isolation device installed below the column pedestal of the upper structure is an orthogonal rail type seismic isolation isolator, and the column pedestal of the upper structure The seismic isolation device installed at a position below the floor beam connecting between the two is characterized by a laminated rubber having a secondary shape factor of 3 or less.

According to this structure, the orthogonal rail type seismic isolation isolator installed at the position below the column base effectively supports the column base axial force regardless of the horizontal displacement at the time of seismic isolation, and is installed at the position below the floor beam. Only when the relative rubber displacement of the ground side and the upper structure can be regarded as almost 0, the load of the upper structure is supported,
At the time of relative displacement, load bearing can be given to the floor beam,
The laminated rubber can provide a vibration damping and a restoring force with respect to the relative displacement between the upper structure and the ground side.

The seismic isolation building according to the invention of claim 4 is:
The laminated rubber is characterized in that it is made of a rubber-like elastic material having a high damping property, such as chloroprene rubber, acrim rubber, and silicone rubber. According to this configuration, the laminated rubber is formed of the rubber-like elastic body having a high damping property, and a high damping property can be obtained.

A seismic isolation building according to the invention of claim 5 is:
The laminated rubber is provided at a position corresponding to an antinode of a primary or secondary natural vibration mode of the floor beam. According to this configuration, the laminated rubber is installed at a position corresponding to the antinode of the primary or secondary natural vibration mode of the floor beam, and the laminated rubber effectively attenuates the primary or secondary natural vibration of the floor beam. Therefore, vibration of floor beams due to traffic vibration or floor walking on the first floor is suppressed, and livability can be improved.

A seismic isolation building according to the invention of claim 6 is:
The vibration frequency obtained from the vertical spring constant of the laminated rubber when there is no deformation and the mass of the upper structure is higher than the secondary natural frequency of the floor beam. According to this configuration, the vibration frequency obtained from the vertical spring constant of the laminated rubber when there is no deformation and the mass of the upper structure becomes higher than the secondary natural frequency of the floor beam, and the natural vibration of the floor beam causes Resonance can be prevented.

A seismic isolation building according to the invention of claim 7 is:
The laminated rubber is fastened and connected only to one of the upper structure side and the ground side, and the other is not fastened. According to this configuration, when a large to large earthquake occurs, when the horizontal displacement between the upper structure side and the ground side is large, the laminated rubber is shifted with respect to the upper structure side or the ground side on the non-fastened side, It is possible to prevent the laminated rubber from being displaced in the shear direction beyond the limit shear direction displacement.

The seismic isolation building according to the invention of claim 8 is:
The friction coefficient of the joint surface between the non-fastened side laminated rubber and the upper structure side or the ground side is the laminated rubber generated at the time of the relative displacement of the limit at which the horizontal rigidity and damping of the laminated rubber normally exhibit performance. The horizontal rigidity is set to a value at which the two slide. According to this configuration, at the time of the relative displacement at which the horizontal rigidity and the damping of the laminated rubber exhibit the normal performance, the laminated rubber is displaced on the non-fastened side with respect to the upper structure side or the ground side, and the laminated rubber is limited. The displacement in the shear direction beyond the displacement in the shear direction can be eliminated.

According to a ninth aspect of the present invention, in the seismic isolation building, the horizontal rigidity of the laminated rubber is set such that the distance between the center of gravity and the center of rigidity of the upper structure is substantially zero. Features. According to this configuration, the horizontal rigidity of the laminated rubber is set so that the distance between the center of gravity and the center of rigidity of the upper structure is substantially zero. Therefore, it is possible to prevent torsion and eliminate relative displacement due to the torsion. it can.

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 7 show an embodiment of a base-isolated building according to the present invention. In these figures, 10 indicates an upper structure, and 20 indicates a foundation on the ground. The upper structure 10 includes four steel-frame columns (column bases) each including a square-frame steel floor girder 11 and a square-frame steel girder ceiling girder 12 (only one is shown).
13A, 13A, 13A, 13A, etc., is a combination of a plurality of box-frame-structure building units rigidly connected to each other by welding or the like.

As shown in FIG. 1, in this method, the pillars 13a may be concentrated where the corners of the building units meet, and for convenience of explanation, the set of two to four pillars 13a is also formed. It is called pillar 13. The same applies to the floor girders 11 and the ceiling girders 12. Right below each column 13, an orthogonal rail type seismic isolation isolator 30 is installed as a seismic isolation device between the foundation 20 and a lower part of the middle of each floor girder 11 on the girder side connecting the adjacent columns 13. A laminated rubber 40 is installed as a seismic isolation device between the base and the base 20.

As shown in FIG. 5, the seismic isolation isolator 30 includes a lower rail 31 connected to the foundation 20,
The upper structure 1 extends in a direction orthogonal to the lower rail 31.
An upper rail 32 connected to the upper rail 32 and a rigid-structure center block 33 that slidably engages the lower rail 31 at the lower part and slidably engages the upper rail 32 at the upper part. It has a structure that maintains column base axial force support regardless of horizontal displacement during seismic isolation.

As shown in FIG. 2, among the seismic isolation isolators 30, those located at the four corners of the upper structure 10 as a whole have lower rails 31 and upper rails 32 whose axial directions are the same. The upper rail 32 is made parallel to a fire beam 16 to be described later, and the lower rail 31 is made orthogonal to the upper rail 32 so as not to be parallel to the horizontal extending direction of the building wall surface and the floor girder 11. 11 are arranged so as to have a 45-degree inclination angle in the horizontal plane with respect to the horizontal extending direction. The seismic isolation isolators 30 other than those located at the four corners are arranged so as to be parallel or orthogonal to the horizontal direction of the building wall and the floor girders 11.

As shown in FIGS. 4A to 4C, the laminated rubber 40 is composed of a rubber-like elastic body 41 having a high damping property, such as chloroprene rubber, acrim rubber, or silicone rubber, and an iron plate 42 alternately. The secondary shape factor is 3 or less, and the vibration frequency obtained from the vertical spring constant at the time of no deformation and the mass of the upper structure 10 is equal to the secondary characteristic of the floor beam (floor beam 11). Higher than the frequency, FIG. 4 (a)
As shown in FIG. 5, only when the relative horizontal displacement between the foundation 20 and the upper structure 10 can be regarded as substantially zero, the upper structure 1
As shown in FIGS. 4 (b) and 4 (c), the structure has a structure that elastically deforms in the shearing direction at the time of relative displacement to give the load to the floor girder 11, for example. ,
The load from the floor and the columns is applied to the floor girders 11, but the laminated rubber normally functions to prevent deflection and vibration of the floor girders 11.

The laminated rubber 40 is installed at a position corresponding to the antinode of the primary or secondary natural vibration mode of the floor beam. The installation position of the laminated rubber 40 may be set according to the span of the column adjacent on the girder surface, and the column span is about 4 to 5 m as shown by reference numerals La and Lb in FIG. If there is, it will be at one place at the center of the half of the floor girder 11, and if it is about 6 m or more as indicated by the symbol Lc, it will be at two places at the center 1/3 of the floor girder 11, and It will have a seismic isolation device.

The upper and lower ends of the laminated rubber 40 are provided with flange plates 43 and 44. The upper flange plate 43 is fastened and connected to the floor girder 11 of the upper structure 10 by bolts or the like. 44 is not fastened through the foundation 20. In this case, the coefficient of friction of the joining surface between the non-fastened side flange plate 44 and the foundation 20 is the horizontal rigidity of the laminated rubber generated at the time of the relative displacement at which the horizontal rigidity and damping of the laminated rubber 40 exhibit the normal performance. Both are set to values that cause slip displacement. The horizontal rigidity of the laminated rubber 40 is:
The distance (eccentric distance) between the center of gravity and the center of rigidity of the upper structure 10 can be set to be substantially zero.

As shown in FIGS. 6 and 7, the floor girders 11 on the first floor of the upper structure 10 correspond to the positions where the seismic isolation isolators 30 are arranged.
L-shaped reinforced base 14 and I-shaped reinforced base 15 made of H-shaped steel or the like are provided underneath. The positions of the L-shaped reinforcement frames 14 are four corners and four corners when viewed in the upper structure 10 as a whole, and correspond to two orthogonal floor girders 11 and 11. The arrangement positions 15 correspond to the joint portions of the building units.

At the four corners of the upper structure 10 as a whole, there are fire beams in the same direction as the extending direction of the upper rail 32 corresponding to the 45-degree inclined arrangement of the seismic isolation isolators 30 at the four corners. An upper rail 32, which is a rail on the upper structure side, is fixed to the fire beam 16. The L-shaped reinforced base 14, the I-shaped reinforced base 15, and the battering beam 16 are attached to the floor girders 11 by welding or the like in the factory production process of the building unit having the box ramen structure, and are fixed in advance to the box ramen structure of the building unit. It is transported to the construction site in a state where it has been set. If it cannot be fixed in advance due to transportation restrictions, it is transported and installed separately from the structure.

As described above, since the seismic isolation isolator 30 of the orthogonal rail type is installed at the position below the column base,
Regardless of the horizontal displacement at the time of seismic isolation, the column base axial force is effectively supported at the position below the column base, and the laminated rubber 40 is installed at the position below the floor beam. 4 (a)
As shown in FIG. 5, only when the relative horizontal displacement between the foundation 20 and the upper structure 10 can be regarded as substantially zero,
As shown in FIGS. 4B and 4C, the floor beam is elastically deformed in the shearing direction at the time of relative displacement, so that the floor beam can bear the load.

With the above-described load supporting structure, the laminated rubber 40 supports only a normal long-term load,
From this, the horizontal rigidity of the laminated rubber 40 can be set low by setting the secondary shape factor of the laminated rubber 40 to 3 or less, and a high-performance seismic isolation bearing can be realized even in a lightweight detached house. An inexpensive restoring damper can be realized, and a restoring force can be applied to the vibration damping effect and the relative displacement between the upper structure 10 and the foundation 20. In addition, since the laminated rubber 40 is made of a rubbery elastic body having a high damping property, such as chloroprene rubber, acrim rubber, and silicone rubber, a high damping property can be obtained, and the comfort can be improved.

Further, the laminated rubber 40 is installed at a position corresponding to the antinode of the primary or secondary natural vibration mode of the floor beam, and furthermore, the vertical spring constant of the laminated rubber 40 and the mass of the upper structure 10 Since the required frequency is higher than the secondary natural frequency of the floor beam, the primary or secondary natural vibration of the floor beam is effectively attenuated by the laminated rubber 40 having high vertical rigidity, and traffic vibration from the outside is obtained. In addition, the floor vibration during walking on the first floor is effectively attenuated, the livability is remarkably improved, and the laminated rubber 40 does not cause a resonance phenomenon due to the floor vibration.

Further, the laminated rubber 40 is connected to the upper structure 10 by fastening, but is not connected to the foundation 20.
The coefficient of friction of the joint surface between the laminated rubber 40 on the non-fastened side and the foundation 20 is determined by the horizontal rigidity of the laminated rubber 40 generated at the time of the relative displacement of the limit at which the horizontal rigidity and damping of the laminated rubber 40 normally perform normally. Since the slip displacement is set to a value, when the horizontal displacement between the upper structure 10 and the ground side is not large, such as when a small earthquake occurs, as shown in FIG. The laminated rubber 40 does not shift with respect to the foundation 20 due to the frictional resistance of the joint surface between the laminated rubber 40 on the fastening side and the foundation 20, and the laminated rubber 40 is elastically deformed in the shearing direction to exhibit a restoration damping effect. When a large displacement in the horizontal direction between the upper structure 10 and the ground side is large, for example, when a middle to large earthquake occurs, as shown in FIG. The displacement of the laminated rubber is prevented, and the displacement of the laminated rubber 40 in the shearing direction beyond the limit shearing direction displacement is avoided, and the durability of the laminated rubber 40 is not reduced or broken, and the safety is highly maintained. Is done.

Among the seismic isolation isolators 30, those located at the four corners of the entire upper structure 10 are lower rails 3.
1. The axial direction of each rail of the upper rail 32 is not parallel to the building wall surface and the horizontal extending direction of the floor girders 11,
Since it is arranged so as to have a 45-degree inclination angle in the horizontal plane with respect to the horizontal extending direction of the floor girders 11, as shown in FIG. The distance between the initial rail support (center block 33) and the column 13 is shorter than when the building is parallel to the building wall, and the distance between the rail support (center block 33) and the column 13 during seismic isolation is accordingly reduced. And the deflection of floor beams during seismic isolation is reduced, locking is less likely to occur, and structural safety is improved.

An L-shaped reinforcing frame 14 and an I-shaped reinforcing frame 15 are provided at positions on the floor girder 11 on the first floor of the upper structure 10 corresponding to the positions where the seismic isolation isolators 30 are arranged. The fire struts 16 are attached in the same direction in the extending direction of the upper rail 32 in correspondence with the 45-degree inclined arrangement of the seismic isolation isolators 30 at the four corners of the four corners of the upper structure 10 as a whole. The floor rigidity of the first floor of the bearing building is effectively improved.

The L-shaped reinforcing frame 14, the I-shaped reinforcing frame 15, and the fire beam 16 are attached to the floor girder 11 by welding or the like in the factory production process of the box-frame-structured building unit, and are attached to the box-frame structure of the building unit. Since it is transported to the construction site in a fixed state in advance, welding work at the construction site becomes unnecessary, shortening the construction time, transportation cost, construction cost is reduced, and because it is factory assembled,
The mounting position accuracy is stable and improved compared to the construction site.

The position of the seismic isolation isolators 30 arranged at an inclination angle of 45 degrees is different from the overall outer shape of the upper structure 10, and as shown in FIG. In a building having a seismic isolator, not only the four corners, but also the seismic isolation isolators 30 at the L-shaped corners of the projecting portion are arranged at an inclination angle of 45 degrees. In the building as shown in FIG. 9, among the floor girders 11 on the first floor of the upper structure 10,
At a position corresponding to the position where each seismic isolation isolator 30 is arranged, an L-shaped reinforcing frame 14 and an I-shaped reinforcing frame 15 are provided.
Also, a T-shaped reinforcement base can be used if necessary.

In the above-described embodiment, the seismic isolation device installed at the position below the pedestal is the orthogonal rail type seismic isolation isolator 30, but the present invention is not limited to this, and is installed at the position below the pedestal. The seismic isolation device only needs to satisfy the condition of maintaining the column base axial force support regardless of the horizontal displacement at the time of seismic isolation. This includes a sliding bearing type seismic isolation device other than the orthogonal rail type, rolling There is a bearing-type seismic isolation device, a highly stable laminated rubber having a secondary shape factor of about 3 to 5, or the like, and these may be used.

[0034]

As will be understood from the above description, according to the base-isolated building according to the first aspect of the present invention, in the base-isolated building in which the upper structure is supported from the ground side by the base-isolation device, A seismic isolation device is installed at each of the lower positions of the pillars of the upper structure and the lower positions of the floor beams connecting between the column pedestals of the upper structure, and at least one of the floor beams below the floor beams, Because it has a configuration with multiple seismic isolation devices, the seismic isolation device installed under the column base effectively supports the column base axial force,
Seismic isolation device installed under the floor beam can be set to effectively dampen vibration, and sufficient seismic isolation effect can be obtained, and structural safety and livability can be secured and improved. .

According to the base-isolated building according to the second aspect of the present invention, in the base-isolated building in which the upper structure is seismically isolated from the ground side by the seismic isolation device, the position below the column base of the upper structure is A seismic isolation device having a structure that maintains column base axial force support regardless of horizontal displacement at the time of seismic isolation is installed, and at a position below a floor beam connecting between column bases of the upper structure, the ground side and the upper structure Only when the relative horizontal displacement of the body can be considered to be almost 0, the load of the upper structure is supported, and the seismic isolation device with the structure that the load beam is given to the floor beam at the time of relative displacement is installed. The seismic isolation device installed at the position effectively supports the column base axial force regardless of the horizontal displacement at the time of seismic isolation, and the seismic isolation device installed under the floor beam makes the relative horizontal between the ground side and the upper structure Only when the displacement can be regarded as almost 0, support the load of the superstructure and The load-bearing during the displacement can have on the floor beams, the vibration damping capacity in the seismic isolation device that is placed under the floor beam position can be efficiently imparted by this,
A sufficient seismic isolation effect can be obtained, and structural safety and livability can be secured and improved.

According to the seismic isolation building according to the third aspect of the present invention, in a seismic isolation building in which the upper structure is seismically isolated from the ground side by the seismic isolation device, it is installed at a position below the column base of the upper structure. The seismic isolation device is an orthogonal rail type seismic isolator, and the seismic isolation device installed below the floor beam connecting the column and base of the upper structure is a laminated rubber having a secondary shape factor of 3 or less. With a certain configuration, the orthogonal rail type seismic isolation isolator installed under the column base effectively supports the column base axial force regardless of the horizontal displacement at the time of seismic isolation, and the stack installed under the floor beam The rubber supports the load of the upper structure only when the relative horizontal displacement between the ground side and the upper structure can be regarded as almost 0, and the load bearing can be given to the floor beam at the time of the relative displacement. To the relative displacement between the superstructure and the ground side Force is applied, it is possible to obtain a sufficient seismic isolation effect, structural safety, livability securing can be improved.

According to the seismic isolation building of the fourth aspect of the present invention, the laminated rubber is made of a rubbery elastic material having a high damping property, such as chloroprene rubber, acrim rubber, and silicone rubber. As a result, a high damping property is obtained, and the livability of the base-isolated building can be significantly improved. According to the seismic isolation building of the fifth aspect of the present invention, since the laminated rubber is installed at a position corresponding to the antinode of the primary or secondary natural vibration mode of the floor beam, The primary or secondary natural vibration of the floor beams is effectively attenuated by the laminated rubber, and the livability of the base-isolated building can be remarkably improved.

According to the seismic isolation building of the sixth aspect of the present invention, the vibration frequency obtained from the vertical spring constant of the laminated rubber when there is no deformation and the mass of the upper structure is determined by the secondary characteristic of the floor beam. Since the configuration is higher than the vibration frequency, the laminated rubber does not resonate due to the natural vibration of the floor beams, and the livability of the base-isolated building can be secured. According to the seismic isolation building of the invention described in claim 7, the laminated rubber is connected to only one of the upper structure side and the ground side by fastening and the other is not fastened. -If the horizontal displacement between the upper structure side and the ground side is large, such as when a large earthquake occurs, the laminated rubber is displaced from the upper structure side or the ground side on the non-fastened side, and the laminated rubber is displaced in the limit shear direction. , And the durability of the laminated rubber is improved.

According to the seismic isolation building of the present invention, the friction coefficient of the joint surface between the non-fastened side laminated rubber and the upper structure side or the ground side is determined by the horizontal rigidity of the laminated rubber. The horizontal stiffness of the laminated rubber, which is generated at the time of the relative displacement at the limit where the damping exerts the normal performance, is set to a value at which both slide and displace. At the maximum relative displacement, the laminated rubber is displaced on the non-fastened side with respect to the upper structure side or the ground side, and the laminated rubber does not exceed the limit shear direction displacement and is not displaced in the shear direction. The performance is improved.

According to the quake-absorbing building of the ninth aspect, the horizontal rigidity of the laminated rubber is set such that the distance between the center of gravity and the center of rigidity of the upper structure is substantially zero. Because of the configuration, the horizontal rigidity of the laminated rubber is set so that the distance between the center of gravity and the center of rigidity of the upper structure is substantially zero,
Twisting can be prevented and relative displacement due to the twisting can be eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing one embodiment of a base-isolated building according to the present invention.

FIG. 2 is a floor plan showing an arrangement of seismic isolation isolators at four corners of a seismic isolation building according to the present invention.

FIG. 3 is a girder view showing an arrangement position of a seismic isolation device in a seismic isolation building according to the present invention.

4 (a) to 4 (c) are elevation views showing an operation state of a laminated rubber in a base-isolated building according to the present invention.

FIG. 5 is a perspective view showing an example of an orthogonal rail type seismic isolation isolator used in the seismic isolation building according to the present invention.

FIG. 6 is a floor plan of the first floor showing an arrangement of fire beams of the base-isolated building according to the present invention.

FIG. 7 is a perspective view showing an arrangement of a fire beam and a reinforcing frame of the base-isolated building according to the present invention.

FIG. 8 is an explanatory diagram showing the operation of an orthogonal rail type seismic isolation isolator arranged at a corner of a building.

FIG. 9 is a floor plan of the first floor showing another embodiment of the base-isolated building according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Upper structure 11 Floor beam 12 Ceiling beam 13 Column 14 L-shaped reinforcement base 15 I-type reinforcement base 16 Fire beam 20 Foundation 30 Seismic isolation device (isolation isolator) 31 Lower rail 32 Upper rail 33 Center block 40 Seismic isolation device ( (Laminated rubber) 41 rubber-like elastic body 42 iron plate 43 flange plate 44 flange plate

Claims (9)

[Claims] 1. A seismic isolation building in which an upper structure is seismically isolated from the ground side by a seismic isolation device, wherein a position below a column base of the upper structure and a position below a floor beam connecting between the column bases of the upper structure. A seismic isolation device is installed in each of the above, and a plurality of seismic isolation devices are provided at a position below at least one of the floor beams. 2. A seismic isolation building in which an upper structure is seismically isolated from the ground side by a seismic isolation device, wherein a column base axial force is applied to a position below the column base of the upper structure regardless of horizontal displacement during seismic isolation. A seismic isolation device having a structure to hold the support is installed, and at a position below the floor beam connecting between the column pedestals of the upper structure,
A seismic isolation device having a structure that supports the load of the upper structure only when the relative horizontal displacement between the ground side and the upper structure can be regarded as substantially zero, and gives the load load to the floor beam at the time of the relative displacement is installed. A seismic isolation building characterized by the following: 3. A seismic isolation building in which an upper structure is seismically isolated from the ground side by a seismic isolation device, wherein the seismic isolation device installed at a position below a column base of the upper structure includes:
An orthogonal rail type seismic isolation isolator, the seismic isolation device installed at a position below the floor beam connecting between the columns of the upper structure,
A seismic isolation building characterized by a laminated rubber having a secondary shape factor of 3 or less. 4. The seismic isolation building according to claim 3, wherein said laminated rubber is made of a rubbery elastic material having a high damping property, such as chloroprene rubber, acrim rubber, and silicone rubber. 5. The seismic isolation building according to claim 3, wherein the laminated rubber is installed at a position corresponding to an antinode of a primary or secondary natural vibration mode of the floor beam. . 6. The vibration frequency obtained from the vertical spring constant of the laminated rubber when there is no deformation and the mass of the upper structure is higher than the secondary natural frequency of the floor beam.
The base-isolated building according to any one of the above items 5 to 5. 7. The laminated rubber according to claim 3, wherein the laminated rubber is connected to only one of the upper structure side and the ground side, and the other is not connected. The seismic isolation building described. 8. The coefficient of friction of the joint surface between the non-fastening-side laminated rubber and the upper structure side or the ground side is determined when the relative rigidity and damping of the laminated rubber exhibit a relative displacement at which the normal performance is obtained. The seismic isolation building according to claim 7, characterized in that the value is set to a value at which the sliding displacement of the two occurs due to the generated horizontal rigidity of the laminated rubber. 9. The horizontal rigidity of the laminated rubber is set such that the distance between the center of gravity and the center of rigidity of the upper structure is substantially zero. The seismic isolation building according to item 1.