Structure

Abstract

To provide a structure that can easily improve earthquake safety of a building.SOLUTION: A structure 3 that is installed horizontally away from a building 2 in which a base isolation device 33b is not installed comprises: a plurality of structural layers 32 that support vertical load and horizontal load applied to the structure 3; a base isolation layer 33 that is installed between any of the plurality of structural layers 32 and in which the base isolation device 33b is installed; and a connecting portion 4 provided in the structural layer 32 and capable of connecting the building 2 and the structural layer 32.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a structure. [Background technology]

[0002] Conventionally, a method of isolating a building by installing a seismic isolation device in the foundation of the building has been known (for example, see Patent Document 1 below). A method of suppressing vibration by installing a vibration damper inside the building has also been known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-125806 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the construction of installing seismic isolation devices in the foundations of existing buildings is not easy and requires large-scale construction. When installing vibration dampers inside a building, the effective space inside the building is reduced. When installing vibration dampers inside an existing building, the building cannot be used during the construction period.

[0005] Therefore, the present invention has been made in consideration of the above circumstances, and provides a structure that can easily improve the earthquake safety of a building. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention employs the following means. In other words, the structure of the present invention is a structure that is installed horizontally away from a building in which a seismic isolation device is not installed, and the structure comprises a plurality of structural layers that support the vertical and horizontal loads applied to the structure, a seismic isolation layer installed between any of the plurality of structural layers and in which a seismic isolation device is installed, and a connecting portion provided in the structural layer and capable of connecting the building and the structural layer.

[0007] In a structure constructed in this way, the structure is installed horizontally apart from the building. The building and the structural layer that supports the vertical and horizontal loads on the structure are connected by a connection part. Therefore, since the structure can be installed separately from the building and close to the building, the earthquake safety of the building can be easily improved without major construction work on the building itself.

[0008] In the structure according to the present invention, the seismic isolation layer may be provided in a plurality of layers spaced apart in the vertical direction.

[0009] In a structure constructed in this way, the seismic isolation layers are provided in multiple layers spaced apart vertically, which greatly reduces the inter-story deformation of the building.

[0010] In addition, in the structure of the present invention, the connecting portions may be provided in each of the multiple structural layers separated by the seismic isolation layer, and the connecting portions provided in different structural layers may extend in different directions when viewed from the top and bottom, and may be capable of being connected to multiple buildings.

[0011] In a structure constructed in this manner, the connecting parts are provided on each of the multiple structural layers. The connecting parts provided on each of the multiple structural layers extend in different directions when viewed from above and below, and are connected to different buildings. Therefore, different earthquake motions are input to the structure from the multiple buildings, and the seismic isolation layer absorbs a large amount of earthquake energy, making it possible to improve the earthquake safety of the multiple buildings with a single structure. Effect of the Invention

[0012] According to the structure of the present invention, the earthquake safety of a building can be easily improved. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram showing a structure according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic exploded perspective view showing a structure of an embodiment of the present invention. [Diagram 3] FIG. 2 is a diagram showing the configuration of a seismic isolation layer of a structure according to one embodiment of the present invention. [Figure 4] FIG. 2 is a diagram for explaining the mechanism of an earthquake occurring in a structure according to one embodiment of the present invention. [Diagram 5] 10A and 10B are diagrams illustrating the configuration of a structure according to a modified example of one embodiment of the present invention and its mechanism during an earthquake. [Figure 6] FIG. 13 is a diagram showing an analytical model of a structure according to a modified example of an embodiment of the present invention. [Figure 7] FIG. 13 is a diagram showing inter-story deformation angles in response to seismic waves 1 and 2 in an analysis of a structure according to a modified example of one embodiment of the present invention. [Figure 8] FIG. 13 is a diagram showing inter-story deformation in an analysis of a structure of a modified example of one embodiment of the present invention. [Figure 9] FIG. 13 is a diagram showing burden energy in an analysis of a structure according to a modified example of one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] A structure according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a structure according to one embodiment of the present invention. As shown in FIG. 1, the structure 3 is connected to the building 2 to bear and absorb part of the earthquake energy input to the building 2.

[0015] The building 2 is a building in which no seismic isolation device is installed. The structure of the building 2 can be appropriately set to a reinforced concrete structure, a steel frame structure, a wooden structure, or the like. The building 2 may be an existing building or a newly constructed building.

[0016] The structure 3 is installed horizontally spaced apart from the building 2. The structure 3 has a foundation 31, a plurality of structural layers 32, a plurality of seismic isolation layers 33, and a connecting portion 4. The structure 3 is configured to be self-supporting. Note that the seismic isolation layer 33 may be only one layer.

[0017] The foundation portion 31 is provided on the ground. The configuration of the foundation portion 31 can be appropriately set to be a pile foundation, a spread foundation such as a strip foundation or a mat foundation.

[0018] FIG. 2 is a schematic exploded perspective view showing the structure 3. As shown in FIG. As shown in Fig. 2, the structural layers 32 and the seismic isolation layers 33 are arranged alternately in the vertical direction in multiple layers. The structural layers 32 support the vertical load and horizontal load applied to the structure 3. In the illustrated example, the structural layer 32 is a substantially cylindrical member formed by intersecting multiple frames 32a and having an axial direction in the vertical direction. The frames 32a are formed of a material such as steel. The structure, shape, and constituent materials of the structural layer 32 can be set as appropriate.

[0019] The structural layer 32X disposed at the top of the plurality of structural layers 32 has a lower height than the other structural layers 32. A membrane member 32b is provided on the upper side of the structural layer 32X. For example, the membrane member 32b may be made of a transparent photovoltaic membrane.

[0020] The seismic isolation layer 33 is installed between any of the multiple structural layers 32. In the illustrated example, the seismic isolation layer 33 is installed between all upper and lower structural layers 32, but it is sufficient that one or more seismic isolation layers 33 are installed, and there may be a portion between the upper and lower structural layers 32 where the seismic isolation layer 33 is not installed.

[0021] FIG. 3 is a diagram showing the configuration of the seismic isolation layer. As shown in FIG. 3, the seismic isolation layer 33 has an upper support portion 33a, a plurality of seismic isolation devices 33b, and a lower support portion 33c. The upper support portion 33a and the lower support portion 33c are substantially annular members in a plan view. The upper support portion 33a is disposed above the lower support portion 33c. A plurality of seismic isolation devices 33b are installed between the upper support portion 33a and the lower support portion 33c. The seismic isolation devices 33b are installed at intervals in the circumferential direction. An upper portion of the seismic isolation device 33b is connected to a lower portion of the upper support portion 33a. A lower portion of the seismic isolation device 33b is connected to an upper portion of the lower support portion 33c.

[0022] The upper support portion 33a is connected to the lower portion of the structural layer 32 disposed above. The lower support portion 33c is connected to the upper portion of the structural layer 32 disposed below.

[0023] As shown in FIG. 1, the connecting portion 4 is provided in the structural layer 32. The connecting portion 4 is capable of connecting the building 2 to the structural layer 32. In the illustrated example, the connecting portion 4 connects a steel beam 21, which is a part of the framework of the building 2, to the structural layer 32 with bolts using members such as joint members and joint members. If the building 2 is made of reinforced concrete, the connecting portion 4 may be connected to the structure 3 with anchor bolts embedded in the building 2. The configuration of the connecting portion 4 that connects the building 2 to the structure 3 can be set as appropriate.

[0024] FIG. 4 is a diagram for explaining the mechanism of the structure 3 during an earthquake. As shown in Fig. 4, during an earthquake, displacement such as shaking of the building 2 is transmitted to the structural layer 32 of the structure 3 via the connecting portion 4. As a result, the entire structure 3 is displaced, with the displacement being particularly large in the seismic isolation layer 33. The seismic isolation device 33b of the displaced seismic isolation layer 33 absorbs the earthquake energy, thereby reducing the response such as displacement of the building 2 itself. Note that, although a seismic isolation device having an energy absorption capacity is adopted here as the seismic isolation device 33b, if a seismic isolation device with a low energy absorption capacity is used, an energy absorbing member such as a vibration damper may be additionally installed.

[0025] (Modification) Next, the modified examples will be described mainly with reference to Fig. 5. In the following description of the modified examples, the same reference numerals will be used to designate the same or similar members and parts as those in the above-described embodiment, and the description will be omitted, and only configurations different from the embodiment will be described. FIG. 5 is a diagram for explaining the configuration of a structure 3 according to a modified example of one embodiment of the present invention and its mechanism during an earthquake. As shown in FIG. 5, in this modification, two buildings 2 are connected by one structure 3. The connecting portion 4A is provided on the structural layer 32A of the structure 3. The connecting portion 4A connects one building 2A to the structural layer 32A. The connecting portion 4B is provided on the structural layer 32B of the structure 3. The connecting portion 4B connects the other building 2B to the structural layer 32B. The structural layer 32A and the structural layer 32B are separated by a seismic isolation layer 33 and are on different layers. The structural layer 32A is a layer located higher than the structural layer 32B. Note that one structure 3 may be connected to three or more buildings 2 by three or more connecting portions 4.

[0026] The height of building 2A is higher than the height of building 2B. The height of structural layer 32A connected to building 2A is higher than the height of structural layer 32B connected to building 2B. Buildings 2A and 2B are installed in different locations. A connecting portion 4A connected to building 2A and a connecting portion 4B connected to building 2B extend in different directions when viewed from the top-bottom direction. In the illustrated example, buildings 2A and 2B are arranged on either side of structure 3, but the arrangement positions of buildings 2A and 2B can be set appropriately.

[0027] Next, we will explain the analysis results for the above modified examples. The analysis model is shown in Figure 6. Figure 7 plots the inter-story deformation of building 2 analyzed with various structural parameters for earthquake wave 1 (El Centro) and earthquake wave 2 (Taft). The circled area is the optimal case for reducing the inter-story deformation of building 2.

[0028] Figure 8 shows the time history response waveforms when earthquake wave 1 is input to an analysis model of only building 2 having a set of structural parameters in the circled region in Figure 7, and when it is input to an analysis model in which building 2 and structure 3 are connected. Figure 9 shows the time integration of the energy absorption amount when earthquake wave 1 is input to an analysis model in which building 2 and structure 3 having a set of structural parameters in the circled region in Figure 7 are connected. As shown in Figure 8, when building 2 and structure 3 are connected, it is possible to reduce inter-story deformation by up to 50% compared to the case of building 2 alone. As shown in Figure 9, it is possible to bear 50% of the earthquake energy acting on building 2 by building 2, and the remaining 50% by structure 3.

[0029] When the structure 3 configured in this manner is used, the structure 3 is installed at a horizontal distance from the building 2. The building 2 and the structural layer 32 that supports the vertical and horizontal loads applied to the structure 3 are connected by a connecting portion 4. Therefore, since it is sufficient to install the structure 3 separately from the building 2 and close to the building 2, the earthquake safety of the building 2 can be easily improved without major construction work on the building 2 itself.

[0030] In addition, the seismic isolation layers 33 are provided in a plurality of layers spaced apart in the vertical direction. Therefore, the inter-story deformation of the building 2 can be significantly reduced.

[0031] Furthermore, the connecting portion 4A is provided on the structural layer 32A, and the connecting portion 4B is provided on the structural layer 32B. The connecting portions 4A, 4B provided on the structural layers 32A, 32B, respectively, extend in different directions when viewed from the top-bottom direction and are connected to different buildings 2A, 2B. Therefore, different earthquake motions are input to the structure 3 from the multiple buildings 2A, 2B, and the seismic isolation layer 33 absorbs a large amount of earthquake energy, so that the single structure 3 can seismically isolate the multiple buildings 2A, 2B. If the heights and frames of the buildings 2A and 2B are different, the natural frequencies of the buildings 2A and 2B are different, so that the structure 3 can further absorb the earthquake energy acting on the buildings 2A and 2B.

[0032] The shapes and combinations of the components shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention. The "Sustainable Development Goals (SDGs)" are 17 international goals that were adopted at the United Nations Summit in September 2015. The structure 3 according to this embodiment can contribute to achieving, for example, "11. Sustainable cities and communities" among the 17 SDGs. [Explanation of symbols]

[0033] 2, 2A, 2B Building 3 structures 4,4A,4B connection part 33 Seismic isolation layer 33b Seismic isolation device

Claims

1. A structure that is installed horizontally away from a building on which a seismic isolation device is not installed, The structure comprises: a plurality of structural layers for supporting vertical and horizontal loads on the structure; a seismic isolation layer installed between any of the plurality of structural layers and having a seismic isolation device installed therein; A structure comprising a connecting portion provided in the structural layer and capable of connecting the building and the structural layer.

2. The structure according to claim 1 , wherein the seismic isolation layer is provided in a plurality of layers spaced apart in the vertical direction.

3. The connecting portion is provided in each of the plurality of structural layers separated by the seismic isolation layer, 3. The structure according to claim 1 or 2, wherein the connecting portions provided on different structural layers extend in different directions when viewed from above and below, and are connectable to a plurality of the buildings.

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