JP2023160727A - Base-isolated structure - Google Patents

Abstract

To reduce facility required for a wind countermeasure and reduce a seismic force by exerting an excellent base isolation effect.SOLUTION: A base-isolated structure comprises a lower layer frame 11, an upper frame 12 provided above the lower layer frame 11, a core part 13 structurally and integrally connected to the lower layer frame 11 and the upper frame 12, an outer peripheral frame 14 arranged at an outer peripheral side of the core part 13 and separated at least from the core part 13 and the lower layer frame 11 and a lower side base isolation layer 21 for coupling the outer peripheral frame 14 with the lower layer frame 11.SELECTED DRAWING: Figure 1

Description

The present invention relates to a seismic isolation structure.

BACKGROUND ART Conventionally, in order to reduce seismic force, an intermediate layer seismic isolation structure as shown in Patent Document 1 has been adopted for, for example, a 200 m class super high-rise seismic isolation structure in which a house and an office are layered. In such an intermediate layer seismic isolation structure, a core-side seismic isolation layer is provided that seismically isolates the lower part of the core part that is integrated with the upper frame on the intermediate seismic isolation layer, and the outer periphery placed around the outer periphery of the core part The lower part of the frame is also supported by the core-side seismic isolation layer, and the core-side seismic isolation layer deforms greatly to efficiently absorb energy and obtain a high response reduction effect.

JP2019-218841A

However, as a countermeasure against wind loads when an intermediate layer seismic isolation structure is adopted in a conventional 200m-class superhigh-rise structure, wind lock dampers, steel dampers, wind-resistant shear pins, etc. are placed between the outer frame and the core. It is known. For example, with wind lock dampers, the lock is turned off during normal times and functions as a seismic isolation damper, and the damper function is locked during strong winds, improving the livability of buildings during strong winds. As described above, conventional mid-layer seismic isolation structures require measures against wind loads, resulting in an oversized structure.

Furthermore, in the conventional intermediate layer seismic isolation structure, a suspension elevator system or a seismic isolation elevator system is adopted as a general structure of the elevator that penetrates the seismic isolation layer. When the suspension elevator system is adopted for an intermediate seismic isolation structure, the length of the suspension structure of the portion of the low-rise frame that extends downward from the seismic isolation layer and accommodates the elevator becomes large. That is, it is structurally difficult to secure a clearance that allows horizontal deformation of the elevator when viewed from above. Therefore, when the seismic isolation layer is located at a high position and the length of the suspension elevator frame is long, the seismic isolation elevator method is often adopted. On the other hand, in the seismic isolation elevator system, deformation limits are set in normal times to prevent the elevator from stopping due to deformation due to annual repeat winds or frequent earthquakes with a seismic intensity of 3, and limits are set based on the following limits and repair limits of the elevator rail. There are restrictions on deformation during earthquakes. In this way, deformation limits are set for elevators, and structural measures are taken to harden the seismic isolation layer and keep building deformation to a minimum, making it impossible to maximize the seismic isolation effect and reduce earthquake force. There was a problem, and there was room for improvement in that respect.
Further, when the height of the upper part of the seismic isolation layer exceeds 150 m, the locking mechanism of the seismic isolation layer becomes excessively large, and as a result, the rigidity of the seismic isolation layer becomes large, and the effect of reducing earthquakes is impaired.

The present invention has been made in view of the above-mentioned problems, and is a seismic isolation structure that can reduce the equipment required for wind countermeasures, exhibit excellent seismic isolation effects, and reduce seismic force. The purpose is to provide something.

In order to achieve the above object, a seismic isolation structure according to the present invention includes a low-rise frame, an upper frame provided above the low-rise frame, and a structure that is structurally integrated with each of the low-rise frame and the upper frame. A connected core part, an outer frame arranged outside the core part and separated from at least the core part and the low-rise frame, and a lower seismic isolation layer connecting the outer frame and the low-rise frame. It is characterized by the following.

In the seismic isolation structure according to the present invention, only the outer frame arranged outside the core part has a seismic isolation structure, and the core part is integrally connected to the upper frame and the lower frame. In other words, the core section that connects to the lower structure bears part of the external wind force and transmits the external wind force to the lower structure without going through the seismic isolation layer, reducing the external wind force that acts on the lower seismic isolation layer. This reduces the equipment required to counter wind loads on the lower seismic isolation layer provided between the outer frame and the core.

Furthermore, according to the present invention, since the core part is structurally connected integrally to each of the lower-rise frame and the upper frame, there is no need to set deformation limits for the elevator, and it is no longer necessary to set restrictions on deformation of the elevator. Structural measures for elevators to harden the structure and keep building deformation to a minimum (for example, structural measures to prevent elevators from stopping due to annual repeat winds that penetrate the upper and lower structures or frequent earthquakes with a seismic intensity of about 3) Since this is no longer necessary, the seismic isolation effect can be maximized. Therefore, in a building in which the height of the upper part of the seismic isolation layer exceeds, for example, 200 m, a seismic isolation structure can be realized and seismic force can be reduced.
Further, according to the present invention, it is possible to easily coexist the outer frame and the lower frame with different structural types on a plane. For example, the outer frame can be a reinforced concrete structure used as a house, and the core part can be a steel frame structure.

Further, in the seismic isolation structure according to the present invention, the upper part of the outer frame is provided separately from the upper frame, and an upper seismic isolation layer is provided that connects the outer frame and the upper frame. It may also be characterized by the presence of

In the present invention, the upper part of the outer frame is provided independently and separated from the upper frame, and an upper seismic isolation layer is provided that connects the outer frame and the upper frame, resulting in better seismic isolation. Effects can be obtained. In the seismic isolation structure of the present invention, since sufficient height can be ensured from the lower seismic isolation layer to the upper seismic isolation layer, the core portion can be flexibly deformed. Therefore, without hindering the deformation of the lower and upper seismic isolation layers of the outer frame, only the outer frame has a seismic isolation structure, but the entire structure has the same deformation performance as a seismically isolated building. .
Further, according to the seismic isolation structure of the present invention, a multilayer seismic isolation structure having a lower seismic isolation layer and an upper seismic isolation layer makes it possible to realize an ultra-long natural period.
Moreover, in this embodiment, since the outer frame is separated from and independent of the lower frame, upper frame, and core part, a structure switching structure is not required even if the structure types of both are different. There are advantages.

Further, in the seismic isolation structure according to the present invention, an upper part of the outer frame is structurally integrally connected to a lower end part of the upper frame, and the outer frame has a lower part connected to the lower frame. It may be characterized in that only the side seismic isolation layer is provided.

In the present invention, the seismic isolation effect described above can be obtained. In addition, in the present invention, since the above-mentioned upper seismic isolation layer that connects the outer frame and the upper frame is not required, installation of a seismic isolation device is required compared to a structure that includes both an upper seismic isolation layer and a lower seismic isolation layer. The number can be reduced.

Further, in the seismic isolation structure according to the present invention, a clearance is provided between the core portion and the outer frame to allow relative displacement in the horizontal direction, and the core portion and the outer frame are moved in the horizontal direction. The device may be characterized by being provided with a movable connecting portion that connects so as to be relatively movable.

Moreover, the seismic isolation structure according to the present invention may be characterized in that the core part, the low-rise frame, the upper frame, and the outer frame have different structural types.

Moreover, the seismic isolation structure according to the present invention may be characterized in that the outer frame is provided all around the core portion.

In the present invention, since the outer frame is arranged so as to surround the core part, the degree of freedom in architectural planning can be increased.

Further, in the seismic isolation structure according to the present invention, a vibration damping member may be provided in the core portion.

In the present invention, since the core part is not a living room, for example, vibration damping members such as oil dampers can be successively installed on each floor, or a large number can be arranged across floors. In addition, since the core section flexibly deforms greatly during earthquakes and strong winds, it can absorb energy more efficiently than when installed on a base-isolated outer frame, further reducing deformation in response to earthquakes and deformation in response to wind loads. can be done.

According to the seismic isolation structure of the present invention, it is possible to reduce the equipment required for wind countermeasures, exhibit excellent seismic isolation effects, and reduce seismic force.

FIG. 1 is a longitudinal cross-sectional view showing the base isolation structure according to the first embodiment. (a) is a sectional view taken along line II shown in FIG. 1, and is a horizontal sectional view of the upper frame; (b) is a sectional view taken along line II-II shown in FIG. 1, and is a horizontal sectional view of the core portion and the outer frame. , (c) is a sectional view taken along the line III-III shown in FIG. 1, and is a horizontal sectional view of the low-rise frame. 2A and 2B are diagrams showing deformation analysis results of the base isolation structure shown in FIG. 1, in which (a) is a diagram showing deformation of the core portion, and (b) is a diagram showing deformation of the entire base isolation structure. It is a longitudinal cross-sectional view showing a base isolation structure according to a second embodiment. It is a vertical cross-sectional view (model 0) of the base isolation structure used in earthquake response analysis. FIG. 2 is a vertical cross-sectional view (Model 1) of the base isolation structure used in earthquake response analysis. It is a graph showing the maximum acceleration of model 1 and model 0 in earthquake response analysis. It is a graph showing the maximum acceleration of Model A and Model 1 in earthquake response analysis. It is a longitudinal cross-sectional view (Model X) of the seismic isolation structure used in wind response analysis. FIG. 3 is a cross-sectional view showing wind input conditions in wind response analysis. It is a graph showing the results of Model A and Model 1 in wind response analysis, which are (a) maximum interstory deformation angle, (b) maximum acceleration, and (c) maximum response layer shear force. It is a graph showing the results of model A and model X in wind response analysis, which are (a) maximum interstory deformation angle, (b) maximum acceleration, and (c) maximum response layer shear force.

Hereinafter, a seismic isolation structure according to an embodiment of the present invention will be described based on the drawings.

(First embodiment)
As shown in FIG. 1, the seismic isolation structure 100 of the first embodiment is, for example, a building over 250 m in length that includes a residential building and an office. It is applied to buildings with a height above 200 m above the base isolation layer 21).

The seismic isolation structure 100 includes a low-rise frame 11, an upper frame 12, a core portion 13, and an outer frame 14 (outer frame). The seismic isolation structure 100 has a rectangular shape when viewed from above. Here, the symbol GL in FIG. 1 indicates the ground level.

The low-rise frame 11 is a low-rise part including an underground section installed from underground to above ground, and is installed on a foundation. The upper frame 12 is provided above the lower frame 11. In this embodiment, an office space, for example, is arranged in the upper frame 12, and a commercial facility or an office, for example, is arranged in the lower frame 11.

The core part 13 is arranged between the lower frame 11 and the upper frame 12 at the center of the building when viewed from above, and is structurally connected to each of them in one piece. That is, the core part 13, the lower frame structure 11, and the upper frame structure 12 are made of steel and have an integral structure. The core portion 13 has a rectangular shape in plan view, as shown in FIG. 2(b).

The core portion 13 is provided with an elevator 15 connected to the upper frame 12 and the lower frame 11, as shown in FIGS. 2(a) to 2(c). The elevator 15 vertically penetrates the core portion 13 and extends continuously inside the lower frame 11 and the upper frame 12. Elevator 15 is provided within the shaft. In addition to the elevator 15, members such as water supply and drainage equipment, air conditioning equipment, and electrical equipment are arranged in the shaft.
Note that the shape of the core portion 13 in plan view is not limited to a rectangular shape as in this embodiment, and other shapes such as a square shape and a circular shape can also be adopted.

The outer peripheral frame 14 is arranged so as to surround the outer peripheral side of the core part 13, and is separated and structurally independent from the core part 13, the lower frame 11, and the upper frame 12. That is, the outer peripheral frame 14 is spaced apart from the core part 13 in the horizontal direction, and spaced apart from the lower frame 11 and the upper frame 12 in the vertical direction.

The outer peripheral frame 14 is provided all around the core portion 13 . The outer peripheral frame 14 is made of reinforced concrete, and for example, a house serving as a living space is placed therein. That is, the outer frame structure 14 has a different structural type from the core part 13, the lower frame structure 11, and the upper frame structure 12, which are made of steel.

A clearance C is provided between the core portion 13 and the outer peripheral frame 14 to allow relative displacement in the horizontal direction. A movable connecting portion 16 is provided between the core portion 13 and the outer circumferential frame 14 to connect the core portion 13 and the outer circumferential frame 14 so as to be relatively movable in the horizontal direction. As the movable connecting portion 16, for example, an expansion joint or the like can be used.
Since the core part 13 and the outer frame 14 have different vibration characteristics in this way, the clearance C is secured between the core part 13 and the outer frame 14 over the entire circumference. The frames 14 can each vibrate independently.

The seismic isolation structure 100 includes a lower seismic isolation layer 21 that connects the outer frame 14 and the low-rise frame 11, and an upper seismic isolation layer 22 that connects the outer frame 14 and the upper frame 12. The lower seismic isolation layer 21 and the upper seismic isolation layer 22 are each provided with a plurality of seismic isolation devices 23. As the seismic isolation device 23, for example, one or more of laminated rubber, sliding bearings, and linear sliders can be used in combination. In this embodiment, the number of installed base isolation devices 23 in the lower base isolation layer 21 is greater than the number of installed base isolation devices 23 in the upper base isolation layer 22. Specifically, in the lower seismic isolation layer 21, the layers are doubly arranged on the inner side, which is arranged on the core side when viewed from the side, and on the outer side. In the upper seismic isolation layer 22, a seismic isolation device 23 is arranged only on the outside.
The heights of the lower seismic isolation layer 21 and the upper seismic isolation layer 22 can be arbitrarily set according to conditions such as the type and shape of the seismic isolation device 23 to be employed, for example.

Next, the operation of the seismic isolation structure 100 described above will be explained in detail based on the drawings.
As shown in FIG. 1, in the seismic isolation structure 100 according to the present embodiment, only the outer peripheral frame 14 disposed on the outer peripheral side of the core part 13 has a seismic isolation structure, and the core part 13 is connected to the upper frame 12 and the lower frame 11. integrally connected. That is, the core part 13 connected to the low-rise structure 11 bears part of the external wind force and transmits the external wind force to the low-rise structure 11 without going through the seismic isolation layer, so the external wind force acting on the lower seismic isolation layer 21 is reduced. can be reduced, and the equipment necessary for countermeasures against wind loads on the lower seismic isolation layer 21 provided between the outer peripheral frame 14 and the core part 13 can be reduced.

Furthermore, according to the present embodiment, since the core part 13 is structurally integrally connected to each of the lower frame 11 and the upper frame 12, there is no need to set deformation limits for the elevator 15, which is different from the conventional Structural measures for the elevator 15 to harden the seismic isolation layer and suppress the deformation of the building to a minimum (for example, the annual reproducible wind of the elevator 15 that penetrates the upper frame 12 and the lower frame 11 and frequent earthquakes with a seismic intensity of about 3) Since there is no need for structural measures (due to the suspension of operations), the seismic isolation effect can be maximized. Therefore, in this embodiment, in a building in which the height of the upper part of the seismic isolation layer exceeds, for example, 200 m, a seismic isolation structure can be realized and seismic force can be reduced.

Furthermore, in this embodiment, the outer peripheral frame 14 and the low-rise frame 11, which have different structural types, can easily coexist on a plane. For example, the outer peripheral frame 14 may be a reinforced concrete structure used as a residence, and the core portion 13 may be a steel frame structure.

In addition, in the seismic isolation structure 100 according to the present embodiment, the upper part of the outer circumferential frame 14 is provided separately from the upper frame 12, and the upper seismic isolation structure connects the outer circumferential frame 14 and the upper frame 12. Since the layer 22 is provided, a better seismic isolation effect can be obtained. In this embodiment, since a sufficient height can be ensured from the lower seismic isolation layer 21 to the upper seismic isolation layer 22, the core portion 13 can be flexibly deformed. Therefore, only the outer frame 14 has a base isolation structure without inhibiting the deformation of the lower base isolation layer 21 and the upper base isolation layer 22 of the outer frame 14, but the entire base isolation structure 100 has the same structure as a base isolation building. The structure becomes a structure that has deformability.

Moreover, according to the base isolation structure 100 of this embodiment, by adopting a multi-layer base isolation structure having the lower base isolation layer 21 and the upper base isolation layer 22, an ultra-long natural period can be realized. I can do it.

Moreover, in this embodiment, the outer peripheral frame 14 is separated from and independent of the lower frame 11, the upper frame 12, and the core part 13, so even if the structure types of both are different, the structure switching structure This has the advantage of eliminating the need for

Moreover, in this embodiment, the outer peripheral frame 14 is arranged so as to surround the core part 13, so that the degree of freedom in architectural planning can be increased.

As described above, the seismic isolation structure 100 according to the present embodiment can reduce the number of equipment required for wind countermeasures, exhibit excellent seismic isolation effects, and reduce seismic force.

Next, an example performed to prove the effects of the seismic isolation structure 100 according to the above-described embodiment will be described below.

(Example)
FIGS. 3A and 3B show an example of an analysis result confirming the seismic isolation effect of the seismic isolation structure 100 of the present embodiment described above.
In this example, numerical simulation analysis is used to create an analytical model equivalent to the base isolation structure 100 shown in FIG. The deformed state of the structure 100 was confirmed. In the seismic isolation structure 100, which is an analysis model, the lower frame 11, the upper frame 12, and the core part 13 are an integrated steel frame structure, and the outer frame 14 is a reinforced concrete structure. A lower seismic isolation layer 21 is provided between the outer peripheral frame 14 and the low-rise frame 11. An upper seismic isolation layer 22 is provided between the outer peripheral frame 14 and the upper frame 12. The base isolation structure 100 has a height above ground of 255 m. In the above-ground part, the height of the low-rise frame 11 is 39 m, the height of the intermediate layer core part 13 and the outer peripheral frame 14 is 124 m, and the height of the upper frame 12 is 92 m.

FIG. 3(a) shows the deformed state of the core portion 13. FIG. 3(b) shows the deformed state of the entire seismic isolation structure 100.
As shown in FIG. 3(a), as a result of the analysis of this example, it is possible to secure a sufficient height from the lower seismic isolation layer 21 to the upper seismic isolation layer 22, so that the core portion 13 can be flexibly deformed. I found out that it will be done. Furthermore, as shown in FIG. 3(b), it was confirmed that the entire seismic isolation structure 100 had deformation performance equivalent to that of the seismically isolated building without inhibiting the deformation of the outer frame 14. .

(Earthquake response analysis)
In this seismic response analysis, we used a bending shear bar model created from an elastic-plastic incremental analysis of a three-dimensional frame model. The input seismic motion was analyzed by inputting the notification wave (Kobe phase) to the fulcrum at the bottom of the foundation.

The models used in the analysis were model 0 shown in FIG. 5, model 1 shown in FIG. 6, and an analysis model (model A) equivalent to the seismic isolation structure 100 shown in FIG.

Model 0 is a model in which a seismic isolation layer 21 is provided between the low-rise frame 11 and the upper layer thereof, and a seismic isolation layer is also provided at the relevant location for the shaft of the elevator 15 and the like. In model 0, portions corresponding to the core portion 13 and outer peripheral frame 14 of model A are integrated. In model 0, a seismic isolation layer like model A is not provided between the outer frame 14 and the upper frame 12.

Model 1 is a model in which a seismic isolation layer is also provided between the low-rise frame 11 and the core part 13 of Model A. Furthermore, model 1 is a model in which a seismic isolation layer is also interposed in the core portion 13 at the position of the lower seismic isolation layer 21 in the core portion 13 .

Figures 7 and 8 show the height distribution of the maximum response acceleration of each floor obtained from the seismic response analysis.
FIG. 7 shows a comparison between model 0 and model 1. Compared to model 0, model 1 has a significant response reduction effect on upper floors. Since the top acceleration has been reduced from 426 (cm/sec ² ) to 192 (cm/sec ² ), a significant response reduction effect of up to about 55% can be confirmed. This is thought to be due to the multilayer base isolation reducing higher-order modes on the upper floors and the significant improvement in the damping performance of the building as a whole. Regarding the lower floors, the response characteristics were roughly the same, confirming the superiority of Model 1.

Next, FIG. 8 shows a comparison between Model 1 and Model A. In Model A, the response acceleration of the platform portion (low-rise frame 11) was significantly reduced compared to Model 1. In particular, it is reduced from 735 (cm/sec ² ) to 496 (cm/sec ² ) directly under the seismic isolation layer, confirming a maximum response reduction effect of about 33%. Regarding the upper floors, Model A and Model 1 have generally the same performance. Therefore, it was confirmed that even if the bottom of the core is not seismically isolated as in Model A, there is almost no effect on the response reduction effect of the living room area. Furthermore, it can be said that model A is more improved than model 1 regarding the podium portion (low-rise frame 11). The reason for the reduction in acceleration of the pedestal part of model A is that the core part 13 is no longer seismically isolated, so a degree of fixation occurs at the top floor of the pedestal part, and response amplification like whiplash is no longer observed. I think so.

(Wind response analysis)
Next, we will confirm the wind response characteristics of the base isolation structure.
This analysis targeted three models: model A shown in FIG. 1, model 1 shown in FIG. 6, and non-seismically isolated seismic frame model X shown in FIG. The wind load is set based on the results of a wind tunnel experiment using a rectangular model. As for the wind direction, a wind direction of 280° is adopted in which the first floor floor shear force is maximum with respect to the assumed planar shape, as shown in FIG. The recurrence period was set at 500 years.

The analysis results are shown in FIGS. 11 and 12. The following can be seen from FIGS. 11 and 12.
Model A does not require a deformation prevention device because the lower part of the shaft (lower part of the elevator 15) is less deformed by wind than Model 1. In addition, model A has a smaller interstory deformation angle in the living room area. Furthermore, model A has a layer shear force of the first layer that is approximately 4% smaller than model X.

Depending on the presence or absence of a seismic isolation layer, the shear force borne by the shaft section and living room area will change, but the response of the layer above the upper seismic isolation layer 22 (upper frame 12) and the layer below the lower seismic isolation layer 21 (low-rise frame 11) will be It can be confirmed that there is almost no difference between each model.

The seismic isolation structure 100 (model A) of this embodiment achieves a maximum acceleration of approximately 150 (cm/sec ² ) or less on all floors during a large earthquake, and performs earthquake response control at a high level. It was confirmed that acceleration reduction could be achieved. Regarding wind response, it was confirmed that although the shear force borne by each part increases or decreases depending on the presence or absence of a seismic isolation layer, the change in wind response of the entire building is small.

From the above, the seismic isolation structures 100 (Model A) can obtain high response control performance without interfering with architectural planning. According to this embodiment, it is possible to flexibly respond to architectural plans and plan a seismic isolation structure with high cost performance and high feasibility.

(Second embodiment)
Next, a seismic isolation structure 100A according to a second embodiment will be described based on FIG. 4.
A seismic isolation structure 100A according to the second embodiment has a structure in which the upper seismic isolation layer 22 (see FIG. 1) of the first embodiment described above is omitted. That is, in the seismic isolation structure 100A, the upper surface 14a (upper part) of the outer peripheral frame 14 is structurally integrally connected to the lower end 12a of the upper frame 12. The outer peripheral frame 14 is provided with only a lower seismic isolation layer 21 connected to the low-rise frame 11. The outer peripheral frame 14 is arranged with a clearance C in the horizontal direction between it and the core part 13, and is also spaced apart from the low-rise frame 11 in the vertical direction.

In the second embodiment, the same seismic isolation effect as in the first embodiment described above can be obtained.
Furthermore, in the second embodiment, since the upper seismic isolation layer 22 (see FIG. 1) that connects the outer peripheral frame 14 and the upper frame 12 is not required, both the upper seismic isolation layer 22 and the lower seismic isolation layer 21 The number of seismic isolation devices 23 installed can be reduced compared to a structure equipped with.

Although the embodiments of the seismic isolation structure according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit thereof.

For example, configurations such as the height, area, planar shape, and dimension of the clearance C of each frame of the base isolation structures 100 and 100A of the embodiments described above can be set as appropriate.

Further, in this embodiment, the core part 13 and the outer circumferential frame 14 are connected to be movable relative to each other in the horizontal direction in a clearance C provided between the core part 13 and the outer circumferential frame 14 that allows relative displacement in the horizontal direction. Although the movable connecting portion 16 is provided, the configuration is not limited to providing the movable connecting portion 16, and the configuration of the movable connecting portion 16 can be set arbitrarily.

In addition, in this embodiment, an example is adopted in which the core part 13, the low-rise frame 11, and the upper frame 12 are made of steel, and the peripheral frame 14 is made of reinforced concrete, and the structure types of each are different. It doesn't matter if it's a structure.

Further, in this embodiment, the outer peripheral frame 14 is provided all around the core portion 13, but it is not limited to the entire circumference. That is, the outer peripheral frame 14, which is an example of the outer frame, may be provided in a part of the circumferential direction around the core portion 13, or may be divided in the circumferential direction. Further, the position of the outer peripheral frame relative to the core portion is not limited to the outer frame being disposed in the circumferential direction on the outer peripheral side of the core portion 13 as in the above embodiment. That is, the outer frame only needs to be disposed outside the core part so as to face the core part in the horizontal direction. For example, the structure may be such that the core part is arranged on one side in the left-right direction, the outer frame is arranged on the other side in the left-right direction, and the core part and the outer frame are arranged side by side.

Furthermore, a damping member such as an oil damper may be provided in the core portion 13 of the seismic isolation structure of this embodiment. In the core part that is not a living room, vibration damping members such as oil dampers can be successively installed on each floor, or a large number of vibration damping members can be arranged across floors. In addition, since the core section flexibly deforms greatly during earthquakes and strong winds, it can absorb energy more efficiently than when installed on a base-isolated outer frame, further reducing deformation in response to earthquakes and deformation in response to wind loads. can be done.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the spirit of the present invention.

100, 100A Seismic isolation structure 11 Low-rise frame 12 Upper frame 13 Core part 14 Peripheral frame (outer frame)
15 Elevator 16 Movable connection part 21 Lower seismic isolation layer 22 Upper seismic isolation layer 23 Seismic isolation device C Clearance

Claims (7)

A low-rise structure,
an upper frame provided above the low-rise frame;
a core part structurally integrally connected to each of the lower frame and the upper frame;
an outer frame disposed outside the core part and separated from at least the core part and the low-rise frame;
a lower seismic isolation layer connecting the outer frame and the low-rise frame;
A seismic isolation structure characterized by being equipped with. The upper part of the outer frame is provided separately from the upper frame,
The seismic isolation structure according to claim 1, further comprising an upper seismic isolation layer that connects the outer frame and the upper frame. an upper part of the outer frame is structurally integrally connected to a lower end of the upper frame;
The seismic isolation structure according to claim 1, wherein the outer frame is provided with only the lower seismic isolation layer that connects with the low-rise frame. A clearance is provided between the core portion and the outer frame to allow relative displacement in the horizontal direction,
The seismic isolation structure according to any one of claims 1 to 3, further comprising a movable connecting portion that connects the core portion and the outer frame so as to be relatively movable in a horizontal direction. The seismic isolation structure according to any one of claims 1 to 3, wherein the core part, the low-rise frame, the upper frame, and the outer frame have different structural types. The seismic isolation structure according to any one of claims 1 to 3, wherein the outer frame is provided all around the core portion. The seismic isolation structure according to any one of claims 1 to 3, wherein the core portion is provided with a damping member.

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