Building

Abstract

To provide a building capable of reducing a drawing force acting on a support part supporting a frame when an earthquake occurs.SOLUTION: A building 10 has a foundation 20 and a frame 40 supported by the foundation 20. The frame 40 has: a central part 41 having first columns 45 located at four corners and second columns 46 located between the first columns 45; and a pair of projecting parts 42 having cantilever beams 48 extending from the central part 41 to the outdoor side and provided on both sides of the central part 41. The foundation 20 supports the frame 40 via a linear rolling bearing constituting a seismic isolation layer 70. The linear rolling bearing is not provided between the foundation 20 and the second column 46 located between the pair of projecting parts 42, but is provided between the foundation 20 and the first column 45.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a building having a foundation and a framework supported by the foundation. [Background technology]

[0002] As a building having a foundation and a frame supported by the foundation, a building with a seismic isolation structure in which the frame is supported by the foundation via a seismic isolation layer has been known, for example, as disclosed in Patent Document 1. The seismic isolation layer has seismic isolation bearings that are provided to support the columns. The seismic isolation bearings function as supports that support the frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-328586 A Summary of the Invention [Problem to be solved by the invention]

[0004] During an earthquake, a pull-out force acts on the seismic isolation bearings, which tries to pull the columns out of the seismic isolation bearings. Therefore, it is required to reduce the pull-out force acting on the seismic isolation bearings during an earthquake. This reduction in pull-out force is not limited to cases where the frame is supported on the foundation via a seismic isolation layer, but is also common to cases where the frame is supported directly on the foundation. [Means for solving the problem]

[0005] A building that solves the above problems includes a foundation and a frame supported by the foundation. The frame has a central portion having first columns located at the four corners and second columns located between the first columns, and a pair of protruding portions provided on both sides of the central portion and having cantilever beams extending from the central portion to the outdoors. The foundation supports the frame via a support portion, and the support portion is provided between the foundation and the first column, without being provided between the foundation and the second columns located between the pair of protruding portions. Effect of the Invention

[0006] According to the present invention, the pull-out force acting on the support part can be reduced when an earthquake occurs. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram illustrating a schematic configuration of an embodiment of a building. [Diagram 2] FIG. 2 is a top view showing a schematic configuration of the frame on the first floor. [Diagram 3] FIG. 4 is a top view showing a schematic configuration of the frame on the second floor. [Figure 4] FIG. 2 is a top view showing a schematic configuration of the frame structure on a floor above the second floor. [Diagram 5] FIG. 2A is a side view showing a schematic diagram of a connection structure between a pillar and a beam, and FIG. 2B is a top view showing a schematic diagram of the connection structure between a pillar and a beam. [Figure 6] FIG. 2 is a perspective view showing a schematic structure of a cantilever beam. [Figure 7] FIG. 2 is a top view showing a schematic configuration of the seismic isolation layer. [Figure 8] FIG. 2 is a side view showing a schematic configuration of the seismic isolation layer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] An embodiment of a building will be described with reference to Figs. 1 to 8. As shown in FIG. 1, a building 10 includes a foundation 20 and a framework 40 . The foundation 20 is provided in an excavation space formed by excavating the ground 11. The foundation 20 has foundation piles 21, a mat slab 22, and foundation columns 23. The foundation piles 21, the mat slab 22, and the foundation columns 23 are integrally formed of reinforced concrete. The foundation piles 21 extend downward in the ground 11 from the bottom of the excavation space. The mat slab 22 is provided so as to cover the bottom of the excavation space. The foundation columns 23 extend upward from a predetermined position of the mat slab 22. The foundation columns 23 support the frame 40 via the seismic isolation layer 70, and form an underground space 25 between the mat slab 22 and the frame 40.

[0009] The frame 40 is formed by joining various steel materials such as H-shaped steel, square steel pipes, and steel plates. The frame 40 is formed of columns and beams connected via joints. The frame 40 has a central portion 41 and a pair of protruding portions 42. In FIG. 1, the areas of the central portion 41 and the protruding portions 42 are shown surrounded by a two-dot chain line.

[0010] In the central portion 41, the first story is supported by the foundation columns 23 via the seismic isolation layer 70. The central portion 41 has a first column 45 and a second column 46 extending from the first story to the top story. As will be described in detail later, the first columns 45 are columns located at the four corners of the central portion 41 when viewed from above the frame 40. The second columns 46 are columns located between the first columns 45 when viewed from above the frame 40. The central portion 41 also has a beam 47 connecting the first column 45 and the second column 46. In the building 10, the living space for users is provided in the central portion 41.

[0011] The protruding portion 42 has a cantilever beam 48 extending from the central portion 41 to the outdoors. In this embodiment, the protruding portions 42 are provided on the right and left sides of the central portion 41 in Fig. 1. In the building 10, the core portion consisting of the elevators, stairs, machine rooms, etc. is mainly provided in the protruding portion 42. Furthermore, the frame 40 has an anti-vibration stud 49 in the protruding portion 42 on the right side in Fig. 1 that connects the cantilever beam 48 between stories.

[0012] (Layout of foundation columns and center of first floor) The following describes the arrangement of the foundation columns 23 and the schematic configuration of the central portion 41. Note that the dashed dotted line shown in the figure indicates the center line of the building 10.

[0013] As shown in Fig. 2, the foundation 20 has foundation columns 23 at the intersections of the centerlines A and C and the centerlines 2, 3, and 4. Note that Fig. 1 shows the framework of a frame 40 in the centerline 2.

[0014] In the first story, the central part 41 has columns at the intersections of the grid lines A, B, C and the grid lines 2, 3, 4. Specifically, the central part 41 has first columns 45 located at the four corners. The central part 41 has, as second columns 46, a second column 46B located between the first columns 45 in the grid lines 2, 4, and a second column 463 located between the first columns 45 in the grid lines A, C. The second column 46B located in the grid lines 2, 4 is the second column 46 located between a pair of protruding parts 42. The second column 46 shown in FIG. 1 is the second column 46B located in the grid line 2. The second column 463 located in the grid lines A, C is the second column 46 located at the base end portion of the protruding part 42, in other words, the boundary portion between the central part 41 and the protruding part 42. In the following, when the second columns 46B and 463 are not distinguished from each other, they are simply referred to as the second column 46. In this embodiment, the central portion 41 has a third pillar 50 at the intersection of the center line B and the center line 3. The third pillar 50 extends from the first story to the second story.

[0015] Furthermore, in the first story, the central portion 41 has beams that extend along the center lines A, B, C, 2, 3, and 4. Specifically, the central portion 41 has a beam 47 that extends along the center lines A, C, 2, and 4 and connects the first column 45 and the second column 46. Furthermore, the central portion 41 has a beam 51 that extends along the center lines B and 3 and connects the second column 46 and the third column 50.

[0016] (Central part in other hierarchies) As shown in FIG. 3, in the second story, the central portion 41 has beams 47, 51 so as to form an open-ceiling space 52 that spans the first and second stories.

[0017] As shown in Fig. 4, in the stories above the second story, the central section 41 has long-span beams 53 that extend along the center line B, 3 and connect the second columns 46B, 463 to each other so that the living space is a column-free space. Of the beams 53, those that extend along the center line 3 have protruding parts 42 on both sides, which reduces stress generated in the center of the beam.

[0018] (Connection structure between joints and beams) The connection structure between the joint and the beam will be explained. Here, the connection structure between the joint and the beam will be explained using as an example a beam connected to a joint located at the intersection of the centerlines A and 3 on a story higher than the second story.

[0019] The beams may have horizontal corbels 55 at their ends that are joined at joints 54, such as the beam 47 shown in Figures 5(a) and 5(b). As shown in FIG. 5(a) and FIG. 5(b), the beam may have a beam body 56 and a widening member 57 joined to the joint 54 by welding. The beam body 56 is formed of an H-shaped steel. The widening member 57 is formed of an H-shaped steel having a width larger than that of the beam body 56. The widening member 57 is joined to the end of the beam body 56 by using a joint. Specifically, the widening member 57 is joined to the end of the beam body 56 by a pair of upper flange joint plates 58 that sandwich the upper flange in the vertical direction, a pair of web joint plates 59 that sandwich the web in the width direction, and a pair of lower flange joint plates 60 that sandwich the lower flange in the vertical direction, which are fastened by fastening members.

[0020] With this structure, the cross-sectional area of ​​the beam end is increased, which increases the strength of the beam end. As a result, the habitability (floor vibration characteristics) can be improved. In addition, the cross-sectional area required for the center of the beam is reduced, which reduces the beam depth.

[0021] In particular, for the long-span beam 53 extending along the center line 3, the stress generated in the center of the beam is reduced by providing the protruding parts 42 on both sides, but the stress generated in the beam end is large. In this regard, by providing the widening members 57 at the beam end, the strength of the beam end can be effectively increased.

[0022] (Cantilever beam) As shown in Fig. 6, the cantilever beam 48 forming the protruding portion 42 may be formed of an H-shaped steel 61 and a cover plate 62. The cover plate 62 is joined to the H-shaped steel 61 so as to cover the side opening of the H-shaped steel 61. This can increase the rigidity of the cantilever beam 48. This configuration may be applied to other beams.

[0023] (Seismic isolation layer) 7, the seismic isolation layer 70 has a linear motion rolling bearing 71 and a laminated rubber 72. The linear motion rolling bearing 71 and the laminated rubber 72 function as a seismic isolation bearing, which is an example of a support portion.

[0024] The linear motion rolling bearings 71 are provided between the foundation column 23 and the first column 45 so as to support the first column 45. More specifically, the linear motion rolling bearings 71 are provided at the intersections with the grid lines A,2, A,4, C,2, and C,4 in top view.

[0025] The laminated rubber 72 is a seismic isolation bearing containing lead plugs and also functions as a damping material. The laminated rubber 72 is provided between the foundation column 23 and the second column 46 so as to support the second column 46 to which the cantilever beam 48 constituting the protruding portion 42 is connected. More specifically, the laminated rubber 72 is provided at the intersection of the center lines A,3 and the intersection of the center lines C,3 in top view.

[0026] In addition, the seismic isolation layer 70 has a damping piece 73 and a steel damper 83. The damping piece 73 and the steel damper 83 function as damping materials. The damping block 73 is provided so as to follow the center lines A, C, 2, and 4 in a top view. One end of the damping block 73 is fixed to a foundation-side fixing part 80 that is integrally formed with the foundation column 23, and the other end is fixed to a beam-side fixing part 81 that is connected to the beam 47.

[0027] As shown in Fig. 8, the foundation-side fixing part 80 is formed in a bent shape (L-shape) that extends below the beam 47 so as to follow the beam 47 and then bends upward. The beam-side fixing part 81 extends downward from the beam 47. The beam-side fixing part 81 is formed of a steel material such as an H-shaped steel joined to the beam 47. The damping top 73 is fixed so as to be sandwiched between the foundation-side fixing part 80 and the beam-side fixing part 81.

[0028] As shown in Fig. 7, the steel damper 83 is provided so as to support from below the beam 47 extending along the center lines A and C. The steel damper 83 is provided so as to be adjacent to the linear motion rolling bearing 71 when viewed from above. The steel damper 83 is provided on a damper support part 84 which is integrally formed with the foundation column 23 which supports the first column 45. Like the foundation-side fixed part 80, the damper support part 84 is formed in a curved shape (L-shape) which extends below the beam 47 along the beam 47 and then bends upward.

[0029] (action) In the above-mentioned building 10, load support is performed by seismic isolation bearings (linear motion rolling bearings 71 and laminated rubber 72) installed in the center lines A and C. Wind load attenuation is performed by the lead plugs of the laminated rubber 72 and the steel dampers 83. Seismic force attenuation is performed by the damping blocks 72 and the steel dampers 83.

[0030] The effects of this embodiment will be described. (1) The frame 40 is supported on the foundation 20 via seismic isolation bearings (linear rolling bearings 71 and laminated rubber 72) provided on the grid centers A and C, without providing a seismic isolation bearing between the foundation 20 and the second column 46B located between the pair of protruding parts 42. This makes it possible to increase the fixed load acting on the seismic isolation bearings located on the grid centers A and C. In addition, because the cantilevered protruding parts 42 are provided on the frame 40, the bending moment acting on the central parts of the beams extending along the grid centers 2, 3, and 4 can be significantly reduced.

[0031] In this way, in the building 10, the fixed load acting on the seismic isolation bearings is increased, and the bending moment acting on the center of the beams extending along the centerlines 2, 3, and 4 is significantly reduced. This makes it possible to reduce the pull-out force acting on the seismic isolation bearings when an earthquake occurs.

[0032] In addition, since the core portion of the building 10 is mainly provided in the protruding portion 42, it is possible to effectively reduce the bending moment acting on the center portion of the beam extending along the center lines 2, 3, and 4. As a result, it is possible to effectively reduce the pull-out force acting on the seismic isolation bearings when an earthquake occurs.

[0033] (2) The foundation 20 supports the frame 40 via seismic isolation bearings (linear motion rolling bearings 71 and laminated rubber 72) which serve as supports. This makes it possible to suppress shaking of the frame 40 relative to the foundation 20 in the event of an earthquake.

[0034] (3) As shown in Fig. 5, the beam in the central portion 41 may have a beam body 56 and an expansion member 57 joined to the end of the beam body 56 and having a width larger than that of the beam body 56. This can increase the strength of the beam end.

[0035] (4) The frame 40 has vibration-isolating studs 49 (see FIG. 1) that connect the cantilever beams 48 between stories. This makes it possible to suppress vibration of the protruding parts 42 in the event of an earthquake. (5) The cantilever beam 48 has an H-shaped steel 61 and a cover plate 62 joined to the H-shaped steel 61 and covering a side opening of the H-shaped steel 61. This can increase the rigidity of the cantilever beam 48.

[0036] This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction. The cantilever beam 48 may be composed of only the H-shaped steel 61.

[0037] The frame 40 does not need to have vibration-isolating studs 49 in the protruding portion 42. The support portion is not limited to a seismic isolation bearing, and may be a part of the foundation column 23. In other words, the foundation column 23 and the frame 40 may be directly joined. [Explanation of symbols]

[0038] 10...building, 11...ground, 20...foundation, 21...foundation pile, 22...mat slab, 23...foundation column, 25...underground space, 40...framework, 41...center, 42...projection, 45...first column, 46, 46B, 463...second column, 47...beam, 48...cantilever beam, 49...vibration-proof stud, 50...third column, 51...beam, 52...open space, 53...beam, 54...joint, 55...horizontal haunch material, 56...beam body, 57...widening material, 58...upper flange joint plate, 59...web joint plate, 60...lower flange joint plate, 61...H-shaped steel, 62...cover plate, 70...seismic isolation layer, 71...linear rolling bearing, 72...laminated rubber, 73...damping block, 80...foundation side fixed part, 81...beam side fixed part, 83...steel damper, 84...damper support part.

Claims

1. A building having a foundation and a frame supported by the foundation, The frame has a central portion having first columns located at four corners and second columns located between the first columns, and a pair of protruding portions provided on both sides of the central portion and having cantilever beams extending from the central portion to the outdoor side, The foundation supports the frame via a support portion, The support portion is provided between the foundation and the first pillar, without being provided between the foundation and a second pillar located between the pair of protruding portions. architecture.

2. The support portion is a seismic isolation bearing provided between the foundation and the frame. The building according to claim 1.

3. The central beam has a beam body and an expansion member joined to an end of the beam body and having a width larger than that of the beam body.

3. A building according to claim 1 or 2.

4. The frame has vibration-proof studs that connect the cantilever beams between stories.

3. A building according to claim 1 or 2.

5. The cantilever beam has an H-shaped steel and a cover plate joined to the H-shaped steel to cover a side opening of the H-shaped steel.

3. A building according to claim 1 or 2.

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