Building structure

Abstract

To provide a building structure which includes a skeleton structure part and a core part connected to the skeleton structure part and including an earthquake-resistant element, and which is excellent in structural safety and stability by suppressing an increase in the amount of eccentricity of a building, while providing a relatively large columnless space usable for various purposes by fairing, inside the skeleton structure part without impairing the rationality of the skeleton structure part.SOLUTION: The frame structure 10 is configured as a structure surrounded by a pair of first outer peripheral surfaces 11 arranged along a first horizontal direction X and a pair of second outer peripheral surfaces 12 arranged along a second horizontal direction Y orthogonal to the first horizontal direction X, and a non-column space 13 in which no column is present is provided inside the frame structure 10 over an entire width of the frame structure 10 in the first horizontal direction X, As the core part 20, a pair of outside core parts 2122 and arranged outside the skeleton structure part 10 in a state of sandwiching the non-column space 13 from both sides in the first horizontal direction X are provided.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a building structure comprising a skeleton structural portion and a core portion connected to the skeleton structural portion and including earthquake-resistant elements. [Background technology]

[0002] In a building structure that has a main structural section and a core section connected to it that contains earthquake-resistant elements (see, for example, Patent Document 1), the core section can bear the seismic force of the building, thereby making it possible to improve the rationality of the main structural section. There are various ways to arrange core parts in such building structures, but in the building structure described in Patent Document 1, multiple core parts are distributed along the periphery of the building, and these multiple core parts are arranged inside the periphery of the building, which is rectangular in plan view. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-279247 Summary of the Invention [Problem to be solved by the invention]

[0004] In the building structure described in Patent Document 1, the entire building consisting of a core portion and a building structural portion connected to it is rectangular in plan view, so the shape of the building structural portion in plan view becomes irregular excluding the core portion, which is a factor that impairs the rationality of the building structural portion. Furthermore, when a relatively large, column-free space that can be used for various purposes is provided inside a building structure, where there are no columns along at least one width of the main structural part, it is necessary to consider a rational placement of the core parts in order to suppress the increase in eccentricity that would result and ensure structural safety and stability. However, if the number and size of the core parts placed along the periphery of the building are simply increased to suppress the increase in eccentricity, there is a concern that the area on the periphery of the main structural part where lighting and ventilation parts can be installed without interfering with the core parts will become smaller. In view of this situation, the main objective of the present invention is to provide a building structure comprising a main structural section and a core section connected to the main structural section and including earthquake-resistant elements, which provides a relatively large, column-free space that can be shaped and used for various purposes without compromising the rationality of the main structural section, while suppressing an increase in the eccentricity of the building, thereby realizing a building structure with excellent structural safety and stability. [Means for solving the problem]

[0005] A first characteristic configuration of the present invention is a building structure including a skeleton structural portion and a core portion connected to the skeleton structural portion and including an earthquake-resistant element, The body structural portion is configured as a structural portion surrounded by a pair of first outer peripheral surfaces arranged along a first horizontal direction and a pair of second outer peripheral surfaces arranged along a second horizontal direction perpendicular to the first horizontal direction, and a column-free space in which no column exists is provided inside the skeleton structural portion across the entire width of the skeleton structural portion in the first horizontal direction, The core portion includes a pair of outer core portions arranged outside the main structure portion so as to sandwich the column-free space from both sides in the first horizontal direction.

[0006] According to this configuration, the skeleton structural unit is configured as a structural unit having a regular shape in a plan view, and a regular column-free space is provided inside the skeleton structural unit, with no columns present across the entire width of the skeleton structural unit along the first horizontal direction. Then, for the skeleton structural unit having such a regular column-free space provided inside, a pair of outer core units as core units including earthquake-resistant elements are arranged in a balanced manner outside the skeleton structural unit, sandwiching the column-free space from both sides along the first horizontal direction, thereby making it possible to effectively suppress eccentricity of the entire building. Furthermore, since seismic forces and vertical loads generated in the main structure can be easily transmitted to the pair of outer core sections through the girders erected in the pair of outer core sections, the girders erected in the pair of outer core sections can be made into relatively long-span beams, thereby realizing a column-free space with a large width in the first horizontal direction. Therefore, the present invention provides a building structure that has a main structural part and a core part that is connected to the main structural part and includes earthquake-resistant elements, and that has a relatively large, column-free space that can be shaped and used for various purposes without compromising the rationality of the main structural part, while suppressing an increase in the eccentricity of the building, thereby realizing a building structure that has excellent structural safety and stability.

[0007] A second characteristic feature of the present invention is that the body structural portion is configured as a structural portion whose width in the first horizontal direction is smaller than its width in the second horizontal direction in a plan view.

[0008] With this configuration, the pair of outer core sections arranged on the outside of the skeleton structural section, sandwiching the column-free space along the first horizontal direction, which is the short side direction of the skeleton structural section, can effectively bear the seismic force along the short side direction of the skeleton structural section. Therefore, by providing as many lighting sections and ventilation sections as possible on the pair of first outer peripheral surfaces arranged along the short side direction of the outer peripheral surfaces of the skeleton structural section, excellent lighting and ventilation properties can be achieved.

[0009] A third characteristic configuration of the present invention is that the pair of outer core portions are dispersed and arranged at intervals at a plurality of locations along the second horizontal direction.

[0010] According to this configuration, the multiple pairs of outer core parts that are distributed at intervals at multiple locations along the second horizontal direction, which is the longitudinal direction of the skeleton structural part, can effectively bear the seismic force along the longitudinal direction of the skeleton structural part. Therefore, excellent lighting and ventilation properties can be achieved by providing as many lighting and ventilation parts as possible in the gaps provided between at least multiple pairs of outer core parts on a pair of second outer peripheral surfaces that are arranged along the longitudinal direction of the outer peripheral surface of the skeleton structural part.

[0011] A fourth characteristic configuration of the present invention is that the core portion is provided only in the first outer region outward of the body structure portion, out of a first outer region adjacent to the first outer surface and a second outer region adjacent to the second outer surface.

[0012] According to this configuration, outside the main structural part, the core part including the earthquake-resistant elements is arranged only in the first outer region adjacent to the first outer surface of the building structural part, and is not arranged in the second outer region adjacent to the second outer surface of the building structural part.Therefore, on the second outer surface, lighting sections and ventilation sections can be arranged over a wide area without interfering with the core part, thereby achieving excellent lighting and ventilation properties.

[0013] A fifth characteristic configuration of the present invention is a structure in which a seismic isolation layer is provided between an upper skeleton having the skeleton structure portion and the outer core portion and a foundation structure portion, The feature is that a plurality of vibration control dampers are arranged in the seismic isolation layer area below the column-free space, which overlaps the column-free space in a plan view in the seismic isolation layer.

[0014] According to this configuration, in the base isolation layer region under the column-free space, which overlaps the column-free space in a plan view of the base isolation layer, the column bases that transmit vertical loads to the foundation structure are present only on the outer periphery, so the inner space is a flexible, unified space without any seismic isolation bearings. Therefore, in the inner space of this base isolation layer region under the column-free space, multiple horizontally oriented vibration control dampers that attenuate horizontal shaking of the upper frame relative to the foundation structure can be easily arranged with a high degree of freedom, and for example, a large number of vibration control dampers can be arranged to achieve excellent vibration control performance.

[0015] A sixth characteristic configuration of the present invention is a structure in which a seismic isolation layer is provided between an upper skeleton having the skeleton structure portion and the outer core portion and a foundation structure portion, In the seismic isolation layer, a plurality of core section seismic isolation bearings are arranged in the seismic isolation layer area below the outer core section which overlaps the outer core section in a planar view, supporting each of the plurality of outer core section columns of the outer core section, and at least the outer seismic isolation bearings located on the outside opposite the column-free space side among the plurality of core section seismic isolation bearings are configured as pull-out type seismic isolation bearings.

[0016] Because the seismic force of the main structure is transmitted to the outer core section, a relatively large tensile axial force is generated in each of the outer core section's columns. Among the multiple seismic isolation bearings supporting the multiple outer core section columns of the outer core section, the inner seismic isolation bearings located at the boundary between the outer core section and the main structure may not generate a pull-out force in which the tensile axial force exceeds the compressive axial force (long-term axial force) due to the relatively large vertical load of the main structure being transmitted. However, among the multiple seismic isolation bearings, the outer seismic isolation bearings located on the opposite side of the outer core section from the main structure may not be adjacent to the main structure and therefore may not easily receive the vertical load of the main structure. Therefore, with this configuration, at least the outer seismic isolation bearings are configured as pull-out-resistant seismic isolation bearings, thereby enabling them to appropriately resist the pull-out force generated in the outer seismic isolation bearings. [Brief explanation of the drawings]

[0017] [Figure 1] Building floor plan [Figure 2] The building frame diagram in the AA direction in Figure 1 [Figure 3] The building frame diagram in the B-B direction in Figure 1 [Figure 4] Floor plan of the building's seismic isolation layer [Figure 5] Enlarged view showing the oil damper mounting structure DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of a building to which the building structure according to the present invention is applied will be described with reference to the drawings. 1, 2, and 3, the building 1 of this embodiment comprises a skeleton structural section 10 and a core section 20 that is connected to the skeleton structural section 10 and includes earthquake-resistant elements (not shown), such as earthquake-resistant walls. In such a building structure, the core section 20 can bear the seismic force of the building 1, thereby improving the rationality of the skeleton structural section 10.

[0019] 1, the skeleton structure 10 is configured as a structure surrounded by a pair of first outer peripheral surfaces 11 (both outer peripheral surfaces located on the left and right in FIG. 1) arranged along a first horizontal direction X, and a pair of second outer peripheral surfaces 12 (both outer peripheral surfaces located on the top and bottom in FIG. 1) arranged along a second horizontal direction Y perpendicular to the first horizontal direction X. Furthermore, the skeleton structure 10 is configured as a rectangular structure in plan view, with the width in the first horizontal direction X being smaller than the width in the second horizontal direction Y in plan view. Inside the main structure 10, a column-free space 13, in which no columns exist, is provided across the entire width of the main structure 10 in the first horizontal direction X and the second horizontal direction Y, and the main structure outer periphery columns 24 are arranged only on the periphery of this column-free space 13. In this embodiment, the body structural part 10 is a structural part whose width in the first horizontal direction X is smaller than its width in the second horizontal direction Y in a plan view, but the body structural part 10 may be a structural part whose width in the first horizontal direction X is larger than its width in the second horizontal direction Y in a plan view.

[0020] That is, as shown in Figure 1, the main structure 10 is configured as a regular rectangular structure in a plan view, and a regular column-free space 13 is provided inside the main structure 10, in which there are no columns across the entire width of the main structure 10 along the first horizontal direction X. Furthermore, outer perimeter columns 24 of the skeleton structure are arranged at the right and left ends of the column-free space 13, and the right face of the outer perimeter column 24 of the right end of the skeleton structure and the left face of the outer perimeter column 24 of the left end of the skeleton structure constitute the second outer perimeter surface 12 (see also Figure 2). On the other hand, outer perimeter columns 24 of the skeleton structure are arranged at the right and left ends of the column-free space 13, and the right face of the outer perimeter column 24 of the right end of the skeleton structure and the left face of the outer perimeter column 24 of the left end of the skeleton structure constitute the first outer perimeter surface 11 (see also Figure 3).

[0021] The main structural part 10 has a regular column-free space 13 inside, and as a core part 20 including earthquake-resistant elements, a pair of outer core parts 21, 22 are arranged in a balanced manner on the outside of the main structural part 10, sandwiching the column-free space 13 on both sides in the first horizontal direction X, as shown in Figures 1 and 3, thereby effectively suppressing the eccentricity of the entire building 1. Furthermore, seismic forces and vertical loads occurring in the skeleton structure 10 are easily transmitted to the pair of outer core portions 21, 22 through the girders 16 erected between the pair of outer core portions 21, 22. As a result, the girders 16 erected between the pair of outer core portions 21, 22 are configured as relatively long-span beams 16A, thereby realizing a column-free space 13 with a large width in the first horizontal direction X.

[0022] 1, the skeleton structural unit 10 is configured as a rectangular structural unit in a plan view, with a width in the first horizontal direction X smaller than a width in the second horizontal direction Y. That is, the pair of outer core members 21, 22 are arranged outside the skeleton structural unit 10, sandwiching a column-free space 13 from both sides along the first horizontal direction X, which is the short-side direction of the skeleton structural unit 10. This allows for as many lighting and ventilation sections as possible to be provided on the pair of first outer peripheral surfaces 11, 12 of the skeleton structural unit 10, which are arranged along the first horizontal direction X, which is the short-side direction, thereby achieving excellent lighting and ventilation properties.

[0023] As shown in Fig. 1, the pair of outer core portions 21, 22 are disposed at intervals at multiple locations along the second horizontal direction Y, which is the longitudinal direction of the skeleton structure 10. Specifically, the two pairs of outer core portions 21, 22 are disposed at intervals along the second horizontal direction Y. That is, in Fig. 1, on the upper side in the vertical direction (second horizontal direction Y), a pair of first outer core portions 21 are disposed outside the skeleton structure 10 in a state where they sandwich the column-free space 13 from both sides along the first horizontal direction X, and on the lower side in the vertical direction (second horizontal direction Y), a pair of second outer core portions 22 are disposed outside the skeleton structure 10 in a state where they sandwich the column-free space 13 from both sides along the first horizontal direction X. As a result, these multiple pairs (specifically, two pairs) of outer core portions 21, 22 effectively bear the seismic force along the second horizontal direction Y, which is the longitudinal direction of the skeleton structural portion 10. Therefore, as many lighting sections and ventilation sections as possible can be provided in the gaps provided between at least the multiple pairs of outer core portions 21, 22 on a pair of second outer peripheral surfaces 12 of the outer peripheral surfaces 11, 12 of the skeleton structural portion 10 that are arranged along the second horizontal direction Y, which is the longitudinal direction, thereby achieving excellent lighting and ventilation properties. In this embodiment, the pair of outer core portions 21, 22 are arranged at two locations along the second horizontal direction Y with a gap between them, but the pair of outer core portions may be arranged at one location along the second horizontal direction Y, or the pair of outer core portions may be arranged at three or more locations along the second horizontal direction Y.

[0024] The pair of first outer core portions 21 and the pair of second outer core portions 22 are arranged to match both ends of the building 1 in the second horizontal direction Y.

[0025] Referring to the plan view of Figure 1, on the outside of the body structural part 10, the area adjacent to a pair of first outer surfaces 11 arranged along the first horizontal direction X, which is the short direction of the body structural part 10, is called the first outer area O1, and the area adjacent to a pair of second outer surfaces 12 arranged along the second horizontal direction Y, which is the long direction of the body structural part 10, is called the second outer area O2. Of the first outer region O1 and the second outer region O2, only the first outer region O1 is provided with the above-mentioned core portion 20. That is, since the core portion 20 is not arranged in the second outer region O2, lighting portions and ventilation portions can be arranged over a wide area on the second outer surface 12 adjacent to the second outer region O2 without interfering with the core portion 20, thereby achieving excellent lighting and ventilation properties. In this embodiment, the core portion 20 is provided only in the first outer region O1, but it may also be provided in the second outer region O2.

[0026] 2, 3, and 4, an upper skeleton 10A having a skeleton structure 10 and outer core portions 21, 22 is separated from a foundation structure 40, and a seismic isolation layer 30 is provided between the upper skeleton 10A and the foundation structure 40. The internal regions of this seismic isolation layer 30 include a seismic isolation layer region 30A below the column-free space that overlaps the column-free space 13 in a plan view (see FIG. 4), and a seismic isolation layer region 30B below the outer core portions that overlap the outer core portions 21, 22 in a plan view (see FIG. 4).

[0027] As shown in FIG. 4 , in the base isolation layer region 30A under the column-free space, which overlaps the column-free space 13 in a plan view, a plurality of horizontally oriented oil dampers 31 (an example of vibration-damping dampers) are arranged to attenuate horizontal shaking of the upper body 10A relative to the foundation structure 40. That is, in the base isolation layer region 30A under the column-free space, column bases that should transmit vertical loads to the foundation structure 40 are present only on the outer periphery. The inner space of the base isolation layer region 30A under the column-free space is a flexible and unified space without the need for such column bases. Therefore, in the inner space of the base isolation layer region 30A under the column-free space, a plurality of oil dampers 31 can be easily arranged with a high degree of freedom. In this embodiment, a large number of oil dampers 31 are arranged, thereby achieving excellent vibration-damping performance.

[0028] As shown in Fig. 5, the mounting structure of the oil damper 31 is such that one end of the oil damper 31 is rotatably connected about a vertical axis to the lower end of a steel-framed beam member 33 that extends downward from the beam of the upper structure 10A and has its upper end fixed to the beam, while the other end of the oil damper 31 is rotatably connected about a vertical axis to a reinforced concrete base 32 that extends upward from the foundation structure 40 and has its bottom fixed to the foundation structure 40. This positions both ends of the oil damper 31 at the same height, and keeps the oil damper 31 in a horizontal position. The oil damper 31 expands and contracts in response to horizontal vibrations of the upper structure 10A relative to the foundation structure 40, thereby damping the horizontal vibrations of the upper structure 10A.

[0029] Periphery seismic isolation bearings 34 that support the outer periphery columns 24 of the skeleton structure, which are located on the outer periphery of the column-free space under seismic isolation layer region 30A, are provided at the column bases of the outer periphery columns 24 of the skeleton structure. These periphery seismic isolation bearings 34 can be configured as pull-out compliant seismic isolation bearings that have pull-out force resistance means that resist pull-out forces, but they can also be configured as non-pull-out compliant seismic isolation bearings that do not have pull-out force resistance means because pull-out forces are less likely to occur. In this embodiment, high-damping rubber laminated rubber bearings or the like can be used as non-pull-out compliant seismic isolation bearings, and linear motion rolling bearings or the like can be used as pull-out compliant seismic isolation bearings. In addition, the arrangement of the outer periphery seismic isolation bearings 34 and oil dampers 31 in the column-free space seismic isolation layer area 30A can be changed as appropriate, and the oil dampers 31 may be arranged in areas of the seismic isolation layer 30 other than the column-free space seismic isolation layer area 30A.

[0030] Each of the outer core portions 21, 22 is provided with a plurality of outer core portion inner columns 25 located at the boundary with the body structural portion 10, and a plurality of outer core portion outer columns 26 located on the opposite side from the body structural portion 10. The plurality of outer core portion inner columns 25 and the plurality of outer core portion outer columns 26 are both arranged side by side along the second horizontal direction Y.

[0031] As shown in Fig. 4, in the seismic isolation layer region 30B below the outer core portion that overlaps the outer core portions 21, 22 in plan view, there are the column bases of the multiple outer core portion inner columns 25 and the column bases of the multiple outer core portion outer columns 26. An inner seismic isolation bearing 35 that supports the outer core portion inner column 25 is provided as a core portion seismic isolation bearing at the column base of each of the multiple outer core portion inner columns 25, and an outer seismic isolation bearing 36 that supports the outer core portion outer column 26 is provided as a core portion seismic isolation bearing at the column base of the outer core portion outer column 26.

[0032] Since the seismic force of the main structural body 10 is transmitted to the outer core portion 21, a relatively large tensile axial force is generated in each of the outer core portion inner columns 25 and the outer core portion outer columns 26 of the outer core portion 21. The inner seismic isolation bearings 35 supporting the outer core portion inner columns 25 can be configured as pull-out type seismic isolation bearings having pull-out force resistance means, but since the transmission of a relatively large vertical load from the main structural body 10 may prevent the generation of a pull-out force in which the tensile axial force exceeds the compressive axial force (long-term axial force), they can also be configured as non-pull-out type seismic isolation bearings that do not have pull-out force resistance means.

[0033] On the other hand, the outer isolation bearings 36 supporting the outer core outer columns 26 are not adjacent to the main structural part 10, and the vertical load of the main structural part 10 is not easily transmitted to them, so there is a high possibility that the tensile axial force will exceed the compressive axial force, resulting in the generation of a pull-out force. Therefore, of the multiple isolation bearings 35, 36 arranged in the seismic isolation layer area 30B below the outer core, at least the outer isolation bearing 36 is configured as a pull-out type isolation bearing having pull-out force resistance means to appropriately resist the pull-out force generated in the outer isolation bearing 36. The arrangement of the seismic isolation bearings 35, 36 in the seismic isolation layer area 30B below the outer core portion can be changed as appropriate. In addition, in this embodiment, the building 1 is seismically isolated by providing the seismic isolation layer 30 between the upper skeleton 10A, which has the skeleton structural portion 10 and the outer core portions 21, 22, and the foundation structural portion 40, but the seismic isolation of the building 1 by providing such a seismic isolation layer 30 may be omitted as appropriate. In other words, the present invention can also be applied to earthquake-resistant buildings that do not have a seismic isolation layer. [Explanation of symbols]

[0034] 1. Building 10 Frame structure 10A upper frame 11 First outer peripheral surface 12 Second outer peripheral surface 13 Columnless space 20 Core 21 outer core 21 First outer core portion (outer core portion) 22 Second outer core part (outer core part) 25 Outer core inner column (outer core column) 26 Outer core outer column (outer core column) 30 Seismic isolation layer 30A Column-free space under seismic isolation layer 30B Seismic isolation layer area under outer core 31 Oil damper (vibration damper) 35 Inner seismic isolation bearing (core seismic isolation bearing) 36 Outer seismic isolation bearing (core seismic isolation bearing) 40 Foundation structure section O1 1st outer area O2 Second outermost area X First horizontal direction Y Second horizontal direction

Claims

1. A building structure comprising a skeleton structural part and a core part connected to the skeleton structural part and including earthquake-resistant elements, The body structural portion is configured as a structural portion surrounded by a pair of first outer peripheral surfaces arranged along a first horizontal direction and a pair of second outer peripheral surfaces arranged along a second horizontal direction perpendicular to the first horizontal direction, and a column-free space in which no column exists is provided inside the skeleton structural portion across the entire width of the skeleton structural portion in the first horizontal direction, A building structure comprising, as the core portion, a pair of outer core portions arranged outside the main structure portion, sandwiching the column-free space from both sides in the first horizontal direction.

2. The building structure according to claim 1 , wherein the skeleton structural portion is configured as a structural portion whose width in the first horizontal direction is smaller than its width in the second horizontal direction in a plan view.

3. The building structure according to claim 2 , wherein the pair of outer core portions are disposed at a plurality of locations along the second horizontal direction, the locations being spaced apart from one another.

4. A building structure described in any one of claims 1 to 3, wherein the core portion is provided only in the first outer region, of a first outer region adjacent to the first outer surface outside the main structural portion and a second outer region adjacent to the second outer surface outside the main structural portion.

5. a base isolation layer is provided between an upper skeleton having the skeleton structure and the outer core portion and a foundation structure; A building structure as described in any one of claims 1 to 3, wherein a plurality of vibration control dampers are arranged in the seismic isolation layer area below the column-free space, which overlaps the column-free space in a planar view in the seismic isolation layer.

6. a base isolation layer is provided between an upper skeleton having the skeleton structure and the outer core portion and a foundation structure; A building structure described in any one of claims 1 to 3, wherein a plurality of core section seismic isolation bearings are arranged in the seismic isolation layer area below the outer core section that overlaps the outer core section in a planar view in the seismic isolation layer, supporting each of a plurality of outer core section columns of the outer core section, and at least one of the plurality of core section seismic isolation bearings, the outer seismic isolation bearing located on the outside opposite the column-free space side, is configured as a pull-out type seismic isolation bearing.

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