JP7244286B2 - Structure - Google Patents

Description

The present invention relates to structures.

A seismic isolation structure is a system that achieves both reduction of seismic motion input by lengthening the natural period and efficient absorption of seismic energy by concentrating deformation on the seismic isolation layer. In recent years, seismic isolation structures with such seismic isolation structures have been adopted not only for government buildings, hospitals, and base facilities with headquarters functions, but also for tenant office buildings, collective housing, school buildings, etc. .

On the other hand, it is necessary to assume various seismic motions with the Tohoku-Chihou-Taiheiyo-Oki Earthquake as an opportunity, and to design structures in consideration of earthquake motions of a higher level than before. In addition, for disaster prevention base facilities and skyscrapers in the city center, there is a demand for proposals for seismic isolation and control technology that achieves even better structural performance.

Based on such trends, a seismic isolation structure described in Patent Literature 1 below has been proposed in order to realize both consideration for greater seismic motion and higher seismic isolation performance. This seismic isolation structure is a structure having multiple seismic isolation layers such as a base isolation layer and an intermediate seismic isolation layer. In addition, in the core part that is integrated with the upper structure on the intermediate seismic isolation layer, the lower part is seismically isolated as the lower core seismic isolation layer, which greatly deforms and efficiently absorbs energy. and a high response reduction effect can be obtained.

JP 2018-009442 A

By the way, in seismic isolation structures, since the laminated rubber, which is often used as a bearing, is weak against tensile force, it is often designed to prevent the building from rocking and to prevent the laminated rubber from generating tensile force. Specifically, the building is designed so that the ratio of width to height (aspect ratio) is about 1:4 or less. Since the length of the building in the short side direction is about 50 m or less, a building whose height in the long side direction exceeds 200 m has an aspect ratio of 4 or more, making it difficult to apply a seismic isolation structure. For this reason, the seismic isolation structure described in Patent Document 1 is rarely applied to skyscrapers with a height exceeding 200 m. Another reason is that it cannot be applied to super high-rise buildings that require supporting loads that exceed the allowable surface pressure of seismic isolation bearings. Another reason is that if the natural period of the building itself becomes longer due to the increase in height, the effect of reducing the response due to seismic isolation becomes smaller than that of a building with a short period.
However, in recent years, many buildings with a height of over 200 m have been constructed, and there is a demand for a structure that exhibits a high response reduction effect for such skyscrapers.

Therefore, the present invention has been made in view of the above circumstances, and provides a structure that exhibits a high response reduction effect for a skyscraper.

In order to achieve the above object, the present invention employs the following means.
That is, a structure according to the present invention includes a core portion having a shaft, a core-side seismic isolation layer provided below the core portion, a main building portion adjacent to the core portion, and the main building portion. A main-side seismic isolation layer provided below the main part of the building, an intermediate seismic isolation layer provided in the middle of the main part of the building, and provided below the core-side seismic isolation layer and the main-side seismic isolation layer, the core a side seismic isolation layer and a seismic section supporting the main side seismic isolation layer, wherein the height position of the lower end of the core section is lower than the height position of the main side seismic isolation layer, and the seismic section The lower part of the main part of the building has a shape that protrudes upward from the lower part of the core part of the earthquake-resistant part, and the upwardly protruding part of the earthquake-resistant part and the lower end of the core part a coupling damping device, wherein the clearance between the upwardly protruding portion of the seismic part and the core is greater than the clearance between the lower layer of the building body and the core; It is characterized by

In the structure constructed in this way, the multi-layer seismic isolation makes it possible to achieve an ultra-long period, and the response acceleration can be halved compared to the conventional seismic isolation structure. In addition, due to the strong core portion, the portion (upper frame) above the intermediate seismic isolation layer in the main part of the building becomes highly rigid, making it possible to suppress the increase in top acceleration (whip response).
Even in super high-rise buildings, the aspect ratio of the multi-layered seismic isolation frame (the frame including the core and the core side seismic isolation layer, and the frame including the main part of the building, the main side seismic isolation layer and the intermediate seismic isolation layer) It can be applied without increasing the size, suppressing rocking of the structure and suppressing excessive tensile force input to the seismic isolation layers (core side seismic isolation layer, main side seismic isolation layer and intermediate seismic isolation layer). be able to.
In addition to the core-side seismic isolation layer, by installing damping devices between the upwardly protruding part of the seismic part and the lower end of the core, more damping devices are installed directly under and around the core. can be installed to enhance the damping effect.

Moreover, it is preferable to provide a vibration damping device that connects the lower part of the core part and the lower part of the main part of the building.

In a structure constructed in this way, by effectively concentrating the deformation on the seismic control device in the lower part of the core, a seismic control effect exceeding that of a simple multi-layer seismic isolation is exhibited, and the acceleration reduction effect and displacement suppression effect are exhibited. The effect can be greatly improved.

Further, in the structure according to the present invention, the portion of the core portion located above the intermediate seismic isolation layer and the portion of the main portion of the building located above the intermediate seismic isolation layer are: A portion of the core portion that is integrally formed structurally and located below the intermediate seismic isolation layer and a portion of the main portion of the building that is located below the intermediate seismic isolation layer are configured to support the seismic damping. You may be connected only by a device.

In a structure constructed in this way, the part of the core part located above the intermediate seismic isolation layer and the part of the main part of the building located above the intermediate seismic isolation layer are structurally integrated. Since it is formed, it is possible to expand the degree of freedom in architectural planning. Further, since the core part and the main part of the building are integrated above the intermediate seismic isolation layer, there is no seismic isolation clearance and there is no need to install an expansion joint.

A structure according to the present invention includes a core portion having a shaft, a core-side seismic isolation layer provided below the core portion, a main building portion adjacent to the core portion, and a lower portion of the main building portion. an intermediate base isolation layer provided in the middle of the main part of the building; and the core side base isolation layer and the core side base isolation layer provided below the main side base isolation layer. and an earthquake-resistant section that supports the seismic layer and the main-side seismic isolation layer, wherein a portion of the earthquake-resistant section below the core section protrudes upward from a portion of the earthquake-resistant section below the main portion of the building. The height position of the upper end of the upwardly projecting portion of the earthquake-resistant section is higher than the height position of the intermediate seismic isolation layer, and the upwardly projecting portion of the earthquake-resistant section and the building principal a damping device that connects the upper part of the intermediate seismic isolation layer in the part, and the clearance between the upper end of the upwardly projecting part of the seismic part and the lower end of the upper layer of the main part of the building is larger than the clearance between the upwardly protruding part of the earthquake-resistant part and the lower layer of the main part of the building .

In the structure constructed in this way, the multi-layer seismic isolation makes it possible to achieve an ultra-long period, and the response acceleration can be halved compared to the conventional seismic isolation structure. In addition, due to the strong core portion, the portion (upper frame) above the intermediate seismic isolation layer in the main part of the building becomes highly rigid, making it possible to suppress the increase in top acceleration (whip response).
Even in super high-rise buildings, the aspect ratio of the multi-layered seismic isolation frame (the frame including the core and the core side seismic isolation layer, and the frame including the main part of the building, the main side seismic isolation layer and the intermediate seismic isolation layer) It can be applied without increasing the size, suppressing rocking of the structure and suppressing excessive tensile force input to the seismic isolation layers (core side seismic isolation layer, main side seismic isolation layer and intermediate seismic isolation layer). be able to.
A portion of the earthquake -resistant portion below the core portion is connected to the core portion by a core-side seismic isolation layer. The core-side seismic isolation layer undergoes deformation corresponding to two layers, the intermediate seismic isolation layer and the main-side seismic isolation layer. By installing attenuation devices such as dampers on the core-side seismic isolation layer, the amount of deformation input to the dampers is doubled compared to placing them on each seismic isolation layer, so the amount of energy absorbed by each damper is doubled. , and a large response reduction effect can be obtained.
Furthermore, in addition to the core-side seismic isolation layer, damping devices can also be installed between the upwardly projecting portion of the seismic portion and the upper portion of the intermediate seismic isolation layer in the main portion of the building. Therefore, more damping devices can be installed directly under and around the core portion, and the damping effect can be enhanced.

Moreover, in the structure according to the present invention, it is preferable that the earthquake-resistant section is installed on the ground.

In the structure configured in this way, the earthquake-resistant section is configured to be installed on the ground, so the installation work of the earthquake-resistant section can be easily performed.

Moreover, in the structure according to the present invention, the earthquake-resistant section may be installed underground.

In a structure constructed in this way, the earthquake-resistant part is installed underground, so the earthquake-resistant part is inconspicuous.

Moreover, in the structure according to the present invention, the main part of the building may be arranged so as to surround the core part.

In a structure constructed in this way, the main part of the building is arranged so as to surround the core part, so the degree of freedom in architectural planning can be increased.

According to the structure according to the present invention, it is possible to exhibit a high response reduction effect for a skyscraper.

BRIEF DESCRIPTION OF THE DRAWINGS It is the longitudinal cross-sectional view which showed typically the structure which concerns on one Embodiment of this invention. 1 is a plan sectional view schematically showing a structure according to one embodiment of the present invention; FIG. FIG. 4 is a longitudinal sectional view schematically showing a structure according to Modification 1 of one embodiment of the present invention; FIG. 5 is a diagram showing a comparison of response acceleration magnifications due to differences in mass ratios in a structure according to a reference example; FIG. 3 is a longitudinal sectional view schematically showing a structure according to Modification 2 of one embodiment of the present invention; FIG. 6 is a cross-sectional view taken along line AA of FIG. 5; 4 is an example of trial calculation of change in damping constant when damping of each seismic isolation layer is increased in a structure according to an embodiment of the present invention. FIG. 10 is a vertical cross-sectional view schematically showing a structure according to Modification 3 of one embodiment of the present invention. FIG. 10 is a longitudinal sectional view schematically showing a structure according to modification 4 of one embodiment of the present invention; FIG. 10 is a cross-sectional view taken along line BB of FIG. 9;

A structure according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view schematically showing a structure according to the first embodiment of the invention. FIG. 2 is a plan cross-sectional view schematically showing a structure according to one embodiment of the present invention.
As shown in FIGS. 1 and 2, in this embodiment, the structure 100 includes an earthquake-resistant section 1 and an upper structure 2 .

The earthquake-resistant section 1 is installed on the ground (on the ground G). The earthquake-resistant part 1 is constructed with a well-known earthquake-resistant structure. The earthquake-resistant section 1 supports the upper structure 2 . As the earthquake-resistant part 1, for example, a brace material installed between columns, an earthquake-resistant wall, or the like is adopted.

The superstructure 2 has a core structure 10 and a building main structure 20 arranged to surround the core structure 10 . Note that the core structure 10 may be an eccentric core or a double-ended core instead of the central core.

The core structure 10 has an under-core seismic isolation layer (core-side seismic isolation layer) 11 and a core portion 12 supported by the under-core seismic isolation layer 11 .

The core portion 12 has a square shape in plan view. The core part 12 has a shaft (not shown, hereinafter the same) on which members such as elevator equipment, water supply and drainage equipment, air conditioning equipment, and electrical equipment are arranged. The core portion 12 is composed of a high-rigidity core wall made of, for example, a reinforced concrete multi-story seismic wall. Although the core portion 12 has a square shape in plan view in the present embodiment, the shape is not limited, and may be a rectangular shape, a circular shape, or the like.

The building main structure 20 has a first seismic isolation layer (main side seismic isolation layer) 21 and a building main portion 22 supported by the first seismic isolation layer 21 .

The main part of the building 22 includes a lower layer 26 supported by the first seismic isolation layer 21, an upper layer 27 arranged above the lower layer 26, and a second floor connecting the lower layer 26 and the upper layer 27 in the vertical direction. 2 seismic isolation layers (intermediate seismic isolation layers) 28 are provided. In other words, the second seismic isolation layer 28 is provided in the middle of the building main portion 22 .

Arbitrary seismic isolation devices and damping devices are installed in the lower core seismic isolation layer 11 , the first seismic isolation layer 21 and the second seismic isolation layer 28 . For example, as a seismic isolation device, one or more of laminated rubber, sliding bearings, and linear sliders can be used together. Moreover, as a damping device, any one or more of an oil damper, a lead damper (including an LRB included in the laminated rubber), a steel material damper, and a friction damper can be used together.

The upper part of the core part 12 of the core structure 10 (the part above the second seismic isolation layer 28 of the main building structure 20 in the core part 12) and the upper layer 27 of the main building structure 20 are structurally integrated. formed. The lower part of the core part 12 (the part below the second seismic isolation layer 28 of the main building structure 20 in the core part 12) and the lower layer 26 of the main building structure 20 are horizontally spaced apart. there is Specifically, the lower part of the building main structure 20 is spaced apart from the lower part of the core part 12 in four directions.

The lower portion of the core portion 12 of the core structure 10 and the lower layer 26 of the main building structure 20 are connected only by a vibration control device (connection damper, damping element) 30 . In the present embodiment, the vibration damping devices 30 are installed at two vertically spaced locations on four sides of the core portion 12 . A spring element and a damping element may be applied as the vibration damping device 30 . In this case, the core structure 10 and the main building structure 20 can also function like the weight elements of the TMD.

In addition, the heights of the earthquake-resistant portion 1, the lower-core seismic isolation layer 11, the first seismic isolation layer 21, and the second seismic isolation layer 28 can be set arbitrarily. The installation height of the second seismic isolation layer 28 can be set arbitrarily.

In addition, the plane volume (area) of the earthquake-resistant section 1 can be expanded with respect to the lower layer 26, the plane volume of the earthquake-resistant section 1 can be expanded with respect to the upper layer 27, or the lower layer 26 can be expanded with the upper layer 27. It is also possible to enlarge the planar volume of the lower layer 26 and the upper layer 27 in the same planar volume. Since the planar volume (area) of the lower layer 26 can be arbitrarily set, the mass ratio between the upper layer 27 and the lower layer 26 can be varied.

In the structure 100 configured in this manner, the multi-layered seismic isolation can achieve an ultra-long period, and the response acceleration can be halved compared to a conventional seismic isolation structure. In addition, due to the strong core structure 10, the portion (upper frame) of the building main structure 20 above the second seismic isolation layer 28 becomes highly rigid, suppressing an increase in top acceleration (whip response). becomes possible.
Furthermore, by effectively concentrating the deformation on the vibration damping device 30 at the bottom of the core structure 10, a vibration damping effect exceeding that of a simple multi-layer seismic isolation is exhibited, and the acceleration reduction effect and displacement suppression effect are greatly improved. can do.

Even in a super high-rise building, it can be applied without increasing the aspect ratio (ratio between the width and height of the building) of the multi-story seismic isolation frame part (upper structure 2), suppressing rocking of the structure 100 and seismic isolation It is possible to suppress input of an excessive tensile force to the layers (the lower core seismic isolation layer 11, the first seismic isolation layer 21, and the second seismic isolation layer 28).

Moreover, since the earthquake-resistant part 1 is configured to be installed on the ground, the installation work of the earthquake-resistant part 1 can be easily performed.

In addition, since the main part 22 of the building is arranged so as to surround the core part 12, it is possible to increase the degree of freedom in architectural planning.

In addition, the portion of the core structure 10 located above the second seismic isolation layer 28 and the portion of the main building structure 20 located above the second seismic isolation layer 28 are structurally integrated. Since it is formed, it is possible to expand the degree of freedom in architectural planning.

Further, since the core part 12 and the building main part 22 are integrated above the second seismic isolation layer 28, there is no seismic isolation clearance and there is no need to install an expansion joint.

In addition, since the lower part of the structure 100 can be set to a desired height as an earthquake-resistant part (earthquake-resistant structure) 1, and the core structure 10 and the main building structure 20 can be set to desired scales (heights), the lower core seismic isolation layer 11 , the supporting load of the seismic isolation devices provided on the first seismic isolation layer 21 and the second seismic isolation layer 28 can be kept within the applicable range.

In addition, since the height of the earthquake-resistant section 1, the height position of the first seismic isolation layer 21, and the height position of the second seismic isolation layer 28 can be set to desired values, the boundaries of uses, etc., can be set according to the architectural plan. can do.

In addition, the plane volume (area) of the earthquake-resistant section 1 can be expanded with respect to the lower layer 26, the plane volume of the earthquake-resistant section 1 can be expanded with respect to the upper layer 27, or the lower layer 26 can be expanded with the upper layer 27. It is also possible to enlarge the planar volume of the lower layer 26 and the upper layer 27 in the same planar volume. Therefore, not only can the required area be set according to the application, but also the mass ratio between the upper layer 27 and the lower layer 26 can be set to a desired value.

Further, in the structure 100, by adopting a multi-layered seismic isolation structure having the first seismic isolation layer 21 and the second seismic isolation layer 28, a very long natural period can be realized.

In addition, the strong core structure 10 is passed through all the layers of the structure 100 to serve as a structural and functional mandrel, and the core structure 10 is connected to the lower layer 26 below the second seismic isolation layer 28. The coupled vibration damping structure enables efficient response control.

Furthermore, by supporting the core portion 12 with the under-core seismic isolation layer 11, it is possible to actively deform the damping device installed in the under-core seismic isolation layer 11 during an earthquake, thereby improving the efficiency of energy absorption. Note that the position of the second seismic isolation layer 28 can be freely determined from the viewpoint of architectural planning such as boundaries of uses.

Further, by configuring as described above, in the structure 100 of the present embodiment, the seismic isolation performance of the area other than the target area of the conventional core-equipped seismic isolation and the multi-layer seismic isolation in the acceleration-displacement relationship is provided. becomes possible.

(Modification 1)
Next, the structure according to Modification 1 of the embodiment shown above will be described mainly with reference to FIG.
In the description of the modification shown below, the same reference numerals are given to the same members as those described above, and the description thereof will be omitted.
FIG. 3 is a longitudinal sectional view schematically showing a structure according to Modification 1 of one embodiment of the present invention.
As shown in FIG. 3, in this modified example, the earthquake-resistant section 1X of the structure 100X is provided underground (inside the ground G). The earthquake-resistant section 1X is constructed with a well-known earthquake-resistant structure. A core structure 10 and a building main structure 20 are provided above the earthquake-resistant section 1X.

In the structure 100X configured in this way, the multi-layer seismic isolation makes it possible to realize an ultra-long period, and to halve the response acceleration compared to the conventional seismic isolation structure. In addition, due to the strong core structure 10, the portion (upper frame) of the building main structure 20 above the second seismic isolation layer 28 is made highly rigid, suppressing the increase in top acceleration (whip swing response). becomes possible. Furthermore, by effectively concentrating the deformation on the vibration damping device 30 at the bottom of the core structure 10, a vibration damping effect exceeding that of a simple multi-layer seismic isolation is exhibited, and the acceleration reduction effect and displacement suppression effect are greatly improved. can do.

It can be applied to a super high-rise building without increasing the aspect ratio (the ratio of the width to the height of the building) of the multi-story seismic isolation frame (upper structure 2), suppressing rocking of the structure 100X and seismic isolation. It is possible to suppress input of an excessive tensile force to the layers (the lower core seismic isolation layer 11, the first seismic isolation layer 21, and the second seismic isolation layer 28).

Moreover, since the earthquake-resistant part 1X is configured to be installed underground, the earthquake-resistant part 1X is inconspicuous.

In addition, by installing the earthquake-resistant section 1X underground as an earthquake-resistant structure, it is possible to install a direct connection from an underground parking lot or an underground mall without providing an expansion joint.

(Modification 2)
Next, a structure according to Modification 2 of the above-described embodiment will be described mainly with reference to FIGS.
FIG. 5 is a longitudinal sectional view schematically showing a structure according to Modification 2 of one embodiment of the present invention. 6 is a cross-sectional view taken along the line AA of FIG. 5. FIG.
In the embodiment shown above, the height position of the lower end of the core portion 12 is substantially the same as the height position of the lower end of the main building portion 22, but in this modified example, as shown in FIG. The height position of the lower end portion 12b of the core portion 12A is lower than the height position of the lower end portion 22b of the main portion 22 of the building.

In the earthquake-resistant section 1A, the lower portion 1c of the building main portion 22 has a shape that protrudes upward from the lower portion 1d of the core portion 12A.

A portion 1e of the earthquake-resistant portion 1A below the main building portion 22 and protruding upward is set back in the horizontal direction away from the core portion 12A relative to the lower layer 26 of the main building portion 22. As shown in FIG. In other words, the clearance (space) a1 between the upward projecting portion 1e of the earthquake-resistant section 1A and the core section 12A is larger than the clearance a2 between the lower layer 26 of the main building section 22 and the core section 12A.

A lower core seismic isolation layer 11A is provided between a lower end portion 12b of the core portion 12A and a portion 1d of the seismic portion 1A below the core portion 12A. The installation height of the lower core seismic isolation layer 11A is lower than the installation height of the first seismic isolation layer 21 .

The lower end portion 12b of the core portion 12A and the upper end portion of the upward projecting portion 1e of the earthquake-resistant portion 1A are arranged to overlap each other by at least one layer. A plurality of damping devices 11B are installed between the lower end portion 12b of the core portion 12A and the portion 1e that protrudes upward from the earthquake-resistant portion 1A. As shown in FIG. 6, in plan view, the damping device 11B is arranged over the entire circumference of the core portion 12A. A plurality of damping devices 11B may be installed in the vertical direction.

Although it depends on the scale of the structure 100A, if the damping devices 11B are installed for one layer, the number of damping devices 11B installed is the number of damping devices installed in the lower core seismic isolation layer 11A. is approximately the same as
For example, when the portion 1e protruding upward of the earthquake-resistant portion 1A is for three layers, the damping device 11B can be installed for two layers. That is, when the portion 1e protruding upward of the earthquake-resistant portion 1A corresponds to three layers, approximately three times as many attenuation devices can be installed as compared to the case where only the lower-core seismic isolation layer 11A is provided.

FIG. 7 is an example of trial calculation of changes in damping constant when damping of each seismic isolation layer is increased in a structure (see FIGS. 1 and 2) according to an embodiment of the present invention. In FIG. 7, _C1 indicates the damping constant of the first seismic isolation layer 21 .
Figures 7(a) to (c) show the changes in the primary damping constant (h1) and secondary damping constant (h2) when the attenuation amount is increased in the damping device installed in each seismic isolation layer. This analysis result assumes a building in which the mass ratio of the upper layer 27 and the lower layer 26 is 2:1.

As shown in FIGS. 7A and 7B, even if many damping devices are installed in the first seismic isolation layer 21 and the second seismic isolation layer 28, the primary damping constant cannot be dramatically increased. Conversely, if too many damping devices are put in the first seismic isolation layer 21 and the second seismic isolation layer 28, there is a concern that the secondary damping constant will be excessively damped.

On the other hand, as shown in FIG. 7C, when many damping devices are installed in the under-core seismic isolation layer 11, the primary damping constant can be efficiently increased without increasing the secondary damping constant. ing. That is, by inserting many damping devices in the under-core seismic isolation layer 11, it is possible to significantly reduce the response of the structure. However, in order to increase the rentable ratio, the area of the core portion 12 is kept to the minimum required in terms of design. Therefore, it is often difficult in terms of space to install many damping devices under the core portion 12 . This modified example can be applied to a super high-rise building exceeding 200 m, and it is possible to install many damping devices under and around the core portion 12A.

In the structure 100A configured in this way, the multi-layer seismic isolation makes it possible to achieve an ultra-long period, and to halve the response acceleration compared to a conventional seismic isolation structure. In addition, due to the strong core structure 10, the portion (upper frame) of the building main structure 20 above the second seismic isolation layer 28 becomes highly rigid, suppressing an increase in top acceleration (whip response). becomes possible.

Even in super high-rise buildings, it can be applied without increasing the aspect ratio (ratio between the width and height of the building) of the multi-story seismic isolation frame (upper structure 2), suppressing rocking of the structure 100A and seismic isolation It is possible to suppress input of an excessive tensile force to the layers (the lower core seismic isolation layer 11A, the first seismic isolation layer 21, and the second seismic isolation layer 28).

In addition to the damping device installed in the core lower seismic isolation layer 11A, the damping device 11B can be installed between the lower end portion 12b of the core portion 12A and the upward projecting portion 1e of the seismic portion 1A. . Therefore, more damping devices can be installed directly under and around the core portion 12A, and the damping effect can be enhanced.

By penetrating the core portion 12A arranged so as to penetrate the first seismic isolation layer 21 and the second seismic isolation layer 28 to the earthquake-resistant portion 1A, an unexpected seismic external force acts, resulting in excessive seismic isolation. Even if layer deformation occurs, the core portion 12A is caught by the earthquake-resistant portion 1A, and the so-called dowel-like effect prevents the structure 100A from dropping or falling at the second seismic isolation layer 28 portion.

(Modification 3)
Next, a structure according to Modification 3 of the above-described embodiment will be described mainly with reference to FIG.
FIG. 8 is a longitudinal sectional view schematically showing a structure according to modification 3 of one embodiment of the present invention.
As shown in FIG. 8, in this modification, in the earthquake-resistant section 1B, the lower portion 1d of the core portion 12B has a shape that protrudes upward from the lower portion 1c of the main building portion 22. As shown in FIG.

In other words, the lower layer 26 of the main part 22 of the building 22 is arranged so as to surround the upwardly projecting portion 1f of the earthquake-resistant portion 1B below the core portion 12B. there is

In the structure 100B configured in this way, the multi-layer seismic isolation makes it possible to achieve an ultra-long period, and to halve the response acceleration compared to the conventional seismic isolation structure. In addition, due to the strong core structure 10, the portion (upper frame) of the building main structure 20 above the second seismic isolation layer 28 becomes highly rigid, suppressing an increase in top acceleration (whip response). becomes possible.

Even in super high-rise buildings, it can be applied without increasing the aspect ratio (ratio between the width and height of the building) of the multi-story seismic isolation frame part (upper structure 2), suppressing rocking of the structure 100B and seismic isolation It is possible to suppress input of an excessive tensile force to the layers (the lower core seismic isolation layer 11C, the first seismic isolation layer 21, and the second seismic isolation layer 28).

A portion 1f of the earthquake-resistant portion 1B below the core portion 12B and protruding upward is connected to the core portion 12B by a core-lower seismic isolation layer 11C. The lower core seismic isolation layer 11</b>C undergoes deformation corresponding to two layers, the second seismic isolation layer 28 and the first seismic isolation layer 21 . By installing a damping device such as a damper in the lower core seismic isolation layer 11C, the deformation input to the damper is doubled compared to the case where it is placed in each seismic isolation layer. It is doubled, and a large response reduction effect can be obtained.

(Modification 4)
Next, a structure according to Modification 4 of the above embodiment will be described mainly with reference to FIGS. 9 and 10. FIG.
FIG. 9 is a longitudinal sectional view schematically showing a structure according to Modification 4 of one embodiment of the present invention. 10 is a cross-sectional view taken along the line BB of FIG. 9. FIG.
As shown in FIG. 9, in the present modification, in the earthquake-resistant section 1C, the lower portion 1d of the core portion 12C has a shape that protrudes upward from the lower portion 1c of the main building portion 22, and protrudes upward. The height position of the upper end portion 1u of the portion 1g is higher than the height positions of the upper end portion 26u of the lower layer 26 of the main building portion 22 and the second seismic isolation layer 28 .

A lower core seismic isolation layer 11D is provided between a lower end portion 12b of the core portion 12C and an upper end portion 1u of a portion 1g of the earthquake-resistant portion 1C that protrudes upward. The installation height of the lower core seismic isolation layer 11</b>D is higher than the installation height of the second seismic isolation layer 28 .

The upper end portion 1u of the portion 1g protruding upward of the earthquake-resistant portion 1C and the lower end portion 27b of the upper layer 27 of the main building portion 22 (the portion above the second seismic isolation layer 28) are arranged to overlap by at least one layer. ing. A plurality of damping devices 11E are installed between the upper end portion 1u of the portion 1g protruding upward from the earthquake-resistant portion 1C and the lower end portion 27b of the upper layer 27 of the building main portion 22. As shown in FIG. As shown in FIG. 10, in plan view, the damping device 11E is arranged over the entire circumference of the core portion 12C. A plurality of damping devices 11E may be installed in the vertical direction.

The clearance between the upper end 1u of the upward projecting portion 1g of the earthquake-resistant portion 1C and the lower end portion 27b of the upper layer 27 of the main building portion 22 is greater than the clearance to the lower layer 26.

In the structure 100C configured in this way, the multi-layer seismic isolation makes it possible to achieve an ultra-long period, and the response acceleration can be halved compared to a conventional seismic isolation structure. In addition, due to the strong core structure 10, the portion (upper frame) of the building main structure 20 above the second seismic isolation layer 28 becomes highly rigid, suppressing an increase in top acceleration (whip response). becomes possible.

It can also be applied to a super high-rise building without increasing the aspect ratio (the ratio of the width to the height of the building) of the multi-story seismic isolation frame (upper structure 2), suppressing the rocking of the structure 100C and seismic isolation. It is possible to suppress input of an excessive tensile force to the layers (the lower core seismic isolation layer 11D, the first seismic isolation layer 21, and the second seismic isolation layer 28).

In addition to the lower core seismic isolation layer 11D, the damping device 11E can also be installed between the upward projecting portion 1g of the seismic portion 1C and the lower end portion 27b of the upper layer 27 of the main portion 22 of the building. Therefore, more damping devices can be installed directly under and around the core portion 12C, and the damping effect can be enhanced.

(Reference example)
FIG. 4 is a diagram showing a comparison of response acceleration magnifications due to differences in mass ratios in a structure without the earthquake-resistant section 1. In FIG.
In FIG. 4, the response acceleration when changing the mass ratio (A/B) between the upper layer 27 (hereinafter referred to as upper layer (A)) and the lower layer (hereinafter referred to as lower layer (B)) indicates magnification. In case 1 A:B=1:1 (A/B=1), in case 2 A:B=2:1 (A/B=2) and in case 3 A:B=4:1 (A/B=4). The upper row shows the two-layer resonance curve of the upper layer (A), and the lower row shows the one-layer resonance curve of the lower layer (B). Also, c3 indicates the damping coefficient of the damping device installed in the lower core seismic isolation layer 11 .

It can be seen from FIG. 4 that the peak value of the absolute response magnification can be reduced by installing the damping device in the under-core seismic isolation layer 11 .

In addition, when the earthquake-resistant part 1 is not provided, when the mass ratio (A/B) increases (approximately four times), the secondary natural period becomes shorter, and the short-period component tends to become dominant. be. Therefore, it can be seen that it is effective to reduce the mass ratio (A/B) by increasing the volume of the lower layer (B), thereby suppressing the predominance of the short-period component.

It should be noted that the various shapes, combinations, etc., of the constituent members shown in the above-described embodiment are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

For example, in the embodiment and modified examples 2 to 4 described above, the earthquake-resistant part is installed on the ground, and in modified example 1, the earthquake-resistant part is installed underground, but the present invention is not limited to this. In Modifications 2 to 4 described above, the earthquake-resistant section may be installed underground, or in the embodiment and Modifications 2-4, the earthquake-resistant section may be installed from underground to above ground.

In addition, in the embodiment shown above, the main building portion 22 is arranged so as to surround the core portion 12, but the present invention is not limited to this, and the main building portion does not surround the core portion. A configuration in which the portion is simply arranged adjacent to the core portion may be used.

In Modified Example 2, the core portion 12A protrudes downward by two layers from the lower layer 26 of the main building portion 22. It is possible to appropriately set whether to protrude by a minute. In Modification 4, the protruding portion 1g of the earthquake-resistant section 1C is projected upward by two layers above the lower layer 26 of the main building section 22, but the protruding portion 1g of the earthquake-resistant section 1C is It is possible to appropriately set how many layers are projected above the lower layer 26 of .

REFERENCE SIGNS LIST 1... Earthquake-resistant section 2... Upper structure 10... Core structure 11... Under-core seismic isolation layer (core-side seismic isolation layer)
12... Core part 20... Building main structure 21... First seismic isolation layer (main side seismic isolation layer)
22...Main portion of building 26...Lower layer 27...Upper layer 28...Second seismic isolation layer (intermediate seismic isolation layer)
30... Vibration damping device 100... Structure

Claims (7)

a core portion having a shaft;
a core-side seismic isolation layer provided below the core;
a main part of the building arranged adjacent to the core part;
a main side seismic isolation layer provided below the main part of the building;
an intermediate seismic isolation layer provided in the middle of the main part of the building;
a seismic-resistant section provided below the core-side seismic isolation layer and the main-side seismic isolation layer and supporting the core-side seismic isolation layer and the main-side seismic isolation layer ;
the height position of the lower end of the core portion is lower than the height position of the main-side seismic isolation layer,
a portion of the earthquake-resistant portion below the main portion of the building has a shape that protrudes upward from a portion of the earthquake-resistant portion below the core portion;
a damping device that connects an upwardly protruding portion of the earthquake-resistant portion and a lower end portion of the core portion;
A structure characterized in that a clearance between the upward projecting portion of the earthquake-resistant section and the core section is larger than a clearance between a lower layer of the main building section and the core section. . a core portion having a shaft;
a core-side seismic isolation layer provided below the core;
a main part of the building arranged adjacent to the core part;
a main side seismic isolation layer provided below the main part of the building;
an intermediate seismic isolation layer provided in the middle of the main part of the building;
a seismic-resistant section provided below the core-side seismic isolation layer and the main-side seismic isolation layer and supporting the core-side seismic isolation layer and the main-side seismic isolation layer ;
A portion of the earthquake-resistant portion below the core portion has a shape that protrudes upward from a portion of the earthquake-resistant portion below the main portion of the building,
a height position of an upper end portion of the upwardly projecting portion of the earthquake-resistant portion is higher than a height position of the intermediate seismic isolation layer;
a damping device that connects an upwardly protruding portion of the earthquake-resistant portion and a portion of the main building portion above the intermediate seismic isolation layer;
The clearance between the upper end of the upwardly protruding part of the earthquake-resistant part and the lower end of the upper layer of the main part of the building is the clearance between the upwardly protruding part of the earthquake-resistant part and the lower layer of the main part of the building. A structure characterized by being greater than the clearance between 3. The structure according to claim 1 , further comprising a vibration damping device that connects the lower part of the core part and the lower part of the main part of the building. A portion of the core portion located above the intermediate seismic isolation layer and a portion of the main building portion located above the intermediate seismic isolation layer are structurally integrally formed,
A portion of the core portion located below the intermediate seismic isolation layer and a portion of the building main portion located below the intermediate seismic isolation layer are connected only by the seismic control device. 4. A structure according to claim 3 , characterized in that: The structure according to any one of claims 1 to 4 , wherein the earthquake-resistant section is installed on the ground. The structure according to any one of claims 1 to 4 , wherein the earthquake-resistant section is installed underground. The structure according to any one of claims 1 to 6 , wherein the main part of the building is arranged so as to surround the core part.

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