Seismic control structure

Abstract

To provide a vibration control structure capable of simplifying a joining structure of a brace and a horizontal member.SOLUTION: A seismic control structure 1 provided in a frame 10 includes: a horizontal member 20 formed of an H-shaped steel and arranged horizontally between a beam 13 and a beam 14; a first brace 30 formed of an H-shaped steel and having one end joined to a joint part 15 between a column 11 and the beam 13 and the other end joined to the horizontal member 20; a second brace 40 formed of an H-shaped steel and having one end joined to a joint part 16 between a column 12 and the beam 13 and the other end joined to the horizontal member 20; and a damper 50 provided between the columns 11, 12 and the horizontal member 20. In the seismic control structure 1, the horizontal member 20, the first brace 30, and the second brace 40 are oriented such that flanges 22, 32, 42 are parallel to a plane formed by the columns 11, 12 and the beams 13, 14, and the flange 32 and the flange 42 are joined to the corresponding flanges 22.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a seismic isolation structure provided in the framework of a building.

Background Art

[0002] As buildings such as office buildings and commercial buildings, in order to enhance their seismic resistance, those in which a seismic isolation structure is provided in a framework composed of columns and beams are known.

[0003] For example, in Patent Document 1, there is described a seismic isolation structure provided in a framework composed of a pair of columns and a pair of beams, which includes a horizontal member formed of H-shaped steel and horizontally disposed between the upper beam and the lower beam, a first brace formed of H-shaped steel with one end joined to the joint of one column and the upper beam and the other end joined to the horizontal member, a second brace formed of H-shaped steel with one end joined to the joint of the other column and the upper beam and the other end joined to the horizontal member, and a pair of dampers respectively provided between one column and the horizontal member and between the other column and the horizontal member, which is a shear link type seismic isolation structure.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above conventional seismic isolation structure, since the horizontal member, the first brace, and the second brace are each used in a posture (vertical use) in which a pair of flanges are located on both sides in the vertical direction of the web, in order to join the first brace and the second brace to the horizontal member with a desired strength, it is necessary to weld a large joining member such as a gusset plate to the flange of the horizontal member, etc., and there is a problem that the structure for joining the brace and the horizontal member becomes complicated.

[0006] The present invention has been made in view of such problems, and an object thereof is to provide a seismic isolation structure capable of simplifying the joint structure between a brace and a horizontal member.

Means for Solving the Problems

[0007] The seismic isolation structure of the present invention is a seismic isolation structure provided in a framework composed of a pair of columns and a pair of beams, and includes a horizontal member formed of an H-shaped steel and horizontally disposed between one of the beams and the other beam; a first brace formed of an H-shaped steel, one end of which is joined to the joint of one of the columns and one of the beams and the other end of which is joined to the horizontal member; a second brace formed of an H-shaped steel, one end of which is joined to the joint of the other column and one of the beams and the other end of which is joined to the horizontal member; and dampers provided on at least one of the spaces between one of the columns and the horizontal member and between the other column and the horizontal member. The horizontal member, the first brace, and the second brace are each in a posture parallel to the plane formed by the columns and the beams with a pair of flanges, and a pair of flanges of the first brace and a pair of flanges of the second brace are each joined to the corresponding flanges of the horizontal member.

[0008] In the seismic isolation structure of the present invention, in the above configuration, it is preferable that the horizontal member, the first brace, and the second brace are formed of H-shaped steels of the same size.

[0009] In the seismic isolation structure of the present invention, in the above configuration, the first brace and the second brace are each located at the center of a pair of the flanges and are provided with sub-flanges parallel to the pair of the flanges. The joint portion is formed in a plate shape parallel to the sub-flange by a steel plate. Connection plate portions parallel to the webs of the braces connected to the joint portion are fixed to both surfaces of the joint portion, respectively. It is preferable that the joint portion and the sub-flange are fastened by a fastening member using a connection plate, and the web of the brace provided with the sub-flange and the connection plate portion are fastened by a fastening member using a connection plate.

Effects of the Invention

[0010] According to the present invention, it is possible to provide a seismic isolation structure capable of simplifying the joint structure between a brace and a horizontal member.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0012] Hereinafter, a seismic isolation structure 1 according to an embodiment of the present invention will be exemplified and described in detail with reference to the drawings.

[0013] The seismic isolation structure 1 according to an embodiment of the present invention shown in FIG. 1 is provided in a framework 10 that forms a part of the building structure 3 of a building 2 such as an office building or a commercial building. The framework 10 is a so-called brace framework. By providing the seismic isolation structure 1 in the framework 10 of the building 2, it is possible to absorb the energy of the earthquake shaking transmitted to the building 2 during an earthquake and reduce the shaking amplitude of the building 2.

[0014] In addition, when the building 2 has a plurality of floors, the seismic isolation structure 1 can be provided in the framework 10 that constitutes each floor. Further, when the building 2 has a plurality of frameworks 10 on each floor, the seismic isolation structure 1 can be provided in all or part of each framework 10.

[0015] The framework 10 is composed of a pair of columns 11, 12 and a pair of beams 13, 14. In the present embodiment, the building structure 3 of the building 2 is of a steel frame structure, and the pair of columns 11, 12 and the pair of beams 13, 14 are each formed of steel.

[0016] More specifically, the columns 11, 12 are formed of steel pipes such as square steel pipes or circular steel pipes. The columns 11, 12 each extend in the vertical direction, are parallel to each other, and are arranged side by side at intervals in the horizontal direction.

[0017] The beams 13, 14 are each formed of H-shaped steel and are used vertically with the flanges 13b, 14b positioned on both sides in the vertical direction with respect to the webs 13a, 14a. The beams 13, 14 each extend in the horizontal direction, are parallel to each other, and are arranged side by side at intervals in the vertical direction with the beam 13 on the upper side and the beam 14 on the lower side. One end (the left end in FIG. 1) of each of the beams 13, 14 is pin-jointed to the column 11, and the other end (the right end in FIG. 1) of each of the beams 13, 14 is pin-jointed to the column 12.

[0018] As described above, the frame 10 is formed in a rectangular shape by a pair of columns 11, 12 and a pair of beams 13, 14 pinned to these columns 11, 12. And the seismic isolation structure 1 is disposed inside the frame 10 formed by the pair of columns 11, 12 and the pair of beams 13, 14, that is, between the pair of columns 11, 12 and between the pair of beams 13, 14.

[0019] The seismic isolation structure 1 is of a so-called shear link type and has a horizontal member 20, a first brace 30, a second brace 40, and a pair of dampers 50.

[0020] The horizontal member 20 is formed of H-shaped steel and is horizontally disposed between the upper beam 13 and the lower beam 14. The length of the horizontal member 20 is shorter than that of the beams 13, 14, and there are spaces respectively between one end in the longitudinal direction of the horizontal member 20 (the left end in FIG. 1) and the column 11, and between the other end in the longitudinal direction of the horizontal member 20 (the right end in FIG. 1) and the column 12.

[0021] The first brace 30 is also formed of H-shaped steel. The first brace 30 is obliquely disposed so as to be inclined with respect to the columns 11, 12 and the beams 13, 14, one end of which is joined to the joint 15 between one column 11 and the upper beam 13, and the other end of which is joined to the horizontal member 20.

[0022] The second brace 40 is also formed of H-shaped steel. The second brace 40 is obliquely disposed so as to be inclined in the opposite direction to the first brace 30 with respect to the columns 11, 12 and the beams 13, 14, one end of which is joined to the joint 16 between the other column 12 and the upper beam 13, and the other end of which is joined to the horizontal member 20.

[0023] In this embodiment, the joint between the first brace 30 and the horizontal member 20 and the joint between the second brace 40 and the horizontal member 20 are adjacent to each other, but these joints may be separated from each other.

[0024] A pair of dampers 50 are provided between one column 11 and the horizontal member 20 and between the other column 12 and the horizontal member 20. That is, one damper 50 is provided between one column 11 and one end of the horizontal member 20, and the other damper 50 is provided between the other column 12 and the other end of the horizontal member 20.

[0025] In this embodiment, the pair of dampers 50 are each oil dampers, and have a cylinder portion 51 that houses oil (not shown) inside, and a plunger portion 52 that is movably incorporated into the cylinder portion 51. Each damper 50 is supported between the horizontal member 20 and the columns 11, 12 by connecting the cylinder portion 51 to the horizontal member 20 via the attachment portion 17 and connecting the plunger portion 52 to the columns 11, 12 via the attachment portion 18.

[0026] When the horizontal member 20 vibrates horizontally with respect to the columns 11, 12, the damper 50 expands and contracts horizontally to absorb the increase and decrease in the distance between the horizontal member 20 and the columns 11, 12, and can attenuate the vibration. In order to support the displacement caused by the horizontal vibration of the horizontal member 20, a slider 19 that supports the horizontal member 20 so as to be horizontally movable may be provided on the lower beam 14.

[0027] In this embodiment, dampers 50 are provided on both sides between one column 11 and the horizontal member 20 and between the other column 12 and the horizontal member 20, but a configuration in which the damper 50 is provided on only one of them may also be used. Further, the damper 50 is not limited to the above-described oil damper, and any other type or configuration may be used as long as it is provided between the columns 11, 12 and the horizontal member 20 and can attenuate the horizontal vibration of the horizontal member 20.

[0028] As shown in FIGS. 1 and 2, the horizontal member 20 formed of H-shaped steel has a web 21 and a pair of flanges 22 connected to both ends of the web 21. And the horizontal member 20 is used in a posture where the pair of flanges 22 are parallel to the plane (virtual plane) formed by the pair of columns 11, 12 and the pair of beams 13, 14. That is, the horizontal member 20 is configured by using the H-shaped steel in a horizontal orientation such that the pair of flanges 22 are located on both horizontal sides of the web 21 (a horizontal orientation where the web 21 extends horizontally between the pair of flanges 22). In other words, the horizontal member 20 is used horizontally so that the weak axis of the H-shaped steel is arranged along the horizontal direction.

[0029] Similarly, the first brace 30 formed of H-shaped steel has a web 31 and a pair of flanges 32 connected to both ends of the web 31. And the first brace 30 is also used in a posture where the pair of flanges 32 are parallel to the plane (virtual plane) formed by the pair of columns 11, 12 and the pair of beams 13, 14. That is, the first brace 30 is also configured by using the H-shaped steel in a horizontal orientation such that the pair of flanges 32 are located on both horizontal sides of the web 31 (a horizontal orientation where the web 31 extends horizontally between the pair of flanges 32). In other words, the first brace 30 is used horizontally so that the weak axis of the H-shaped steel is arranged along the horizontal direction.

[0030] Similarly, the second brace 40 formed of H-shaped steel also has a web 41 and a pair of flanges 42 connected to both ends of the web 41. And the second brace 40 is also used in a posture where the pair of flanges 42 are parallel to the plane (virtual plane) formed by the pair of columns 11, 12 and the pair of beams 13, 14. That is, the second brace 40 is also configured by using the H-shaped steel in a horizontal orientation such that the pair of flanges 42 are located on both horizontal sides of the web 41 (a horizontal orientation where the web 41 extends horizontally between the pair of flanges 42). In other words, the second brace 40 is used horizontally so that the weak axis of the H-shaped steel is arranged along the horizontal direction.

[0031] In this embodiment, the horizontal member 20, the first brace 30, and the second brace 40 are formed of H-shaped steel of the same size. That is, the width, thickness, height, and thickness of the web 21 of the horizontal member 20 are the same as the width, thickness, height, and thickness of the webs 31 and 41 of the first brace 30 and the second brace 40, respectively, and the height and thickness of the flanges 22, 32, and 42.

[0032] As shown in FIGS. 1 and 2, the first brace 30 is joined to the horizontal member 20 by joining a pair of flanges 32 to the corresponding flanges 22 of the horizontal member 20 at the lower end thereof. That is, one flange 32 at the lower end of the first brace 30 is joined to the corresponding one flange 22 of the horizontal member 20, and the other flange 32 of the first brace 30 is joined to the corresponding other flange 22 of the horizontal member 20, whereby the first brace 30 is joined to the horizontal member 20. In this embodiment, since the horizontal member 20 and the first brace 30 are formed of H-shaped steel of the same size, the flange 32 of the first brace 30 is joined to the end face of the flange 22 of the horizontal member 20 by welding at its end face.

[0033] In this embodiment, the first brace 30 has a configuration in which a main body portion 30a and a joint portion 30b each formed of H-shaped steel are connected by being fastened with a fastening member 30d such as a bolt and a nut using a connection plate 30c (in FIGS. 1 and 2, only one fastening member 30d is labeled for convenience), and the flange 32 at the joint portion 30b is joined to the corresponding flange 22 of the horizontal member 20 by welding. In this case, after joining the flange 32 at the joint portion 30b to the corresponding flange 22 of the horizontal member 20 by welding, the main body portion 30a is connected to the joint portion 30b, whereby the first brace 30 can be easily joined to the horizontal member 20.

[0034] As shown in FIG. 1, similar to the first brace 30, the second brace 40 is joined to the horizontal member 20 by joining a pair of flanges 42 to the corresponding flanges 22 of the horizontal member 20 at its lower end. That is, one flange 42 at the lower end of the second brace 40 is joined to one corresponding flange 22 of the horizontal member 20, and the other flange 42 of the second brace 40 is joined to the other corresponding flange 22 of the horizontal member 20, whereby the second brace 40 is joined to the horizontal member 20. In the present embodiment, since the horizontal member 20 and the second brace 40 are formed of H-shaped steel of the same size, the flange 42 of the second brace 40 is joined to the end face of the flange 22 of the horizontal member 20 by welding at its end face.

[0035] In the present embodiment, the second brace 40 has a configuration in which a main body portion 40a and a joint portion 40b, each formed of H-shaped steel, are connected by being fastened with fastening members 40d such as bolts and nuts using a connection plate 40c (in FIG. 1, only one fastening member 40d is labeled for convenience), and the flange 42 at the joint portion 40b is joined to the corresponding flange 22 of the horizontal member 20 by welding. In this case, after joining the flange 42 at the joint portion 40b to the corresponding flange 22 of the horizontal member 20 by welding, the main body portion 40a is connected to the joint portion 40b, whereby the second brace 40 can be easily joined to the horizontal member 20.

[0036] Thus, in the seismic isolation structure 1 according to this embodiment, the horizontal member 20, the first brace 30, and the second brace 40 formed of H-shaped steel are arranged such that the pair of flanges 22, 32, 42 are located on both horizontal sides of the webs 21, 31, 41, respectively. The pair of flanges 32 of the first brace 30 and the pair of flanges 42 of the second brace 40 are joined to the corresponding flanges 22 of the horizontal member 20, respectively. Therefore, the first brace 30 and the second brace 40 can be joined to the horizontal member 20 with a simple structure without using large-scale joining members such as gusset plates. Accordingly, according to the seismic isolation structure 1 of this embodiment, the joining structure between the first brace 30 and the second brace 40 and the horizontal member 20 can be simplified.

[0037] Further, in the seismic isolation structure 1 according to this embodiment, since the horizontal member 20, the first brace 30, and the second brace 40 are formed of H-shaped steel of the same size, the flanges 32 of the first brace 30 to the flanges 42 of the second brace 40 can be joined to the end faces of the flanges 22 of the horizontal member 20 by welding at their end faces, and the joining structure between the first brace 30 and the second brace 40 and the horizontal member 20 can be further simplified.

[0038] Note that the size of the H-shaped steel forming the first brace 30 and the second brace 40 may be different from the size of the H-shaped steel forming the horizontal member 20 as long as the flanges 32 of the first brace 30 to the flanges 42 of the second brace 40 can be joined to the flanges 22 of the horizontal member 20, for example, by welding the side faces of the flanges 32 of the first brace 30 to the side faces of the flanges 22 of the horizontal member 20 at their side faces.

[0039] In the seismic isolation structure 1 according to this embodiment, the joining of the upper end of the first brace 30 to the joint 15 between the column 11 and the beam 13, and the joining of the upper end of the second brace 40 to the joint 16 between the column 12 and the beam 13 may be performed using an appropriate joining structure.

[0040] In this embodiment, the joints between the upper ends of the first brace 30 and the joint 15 between the column 11 and the beam 13, and the joints between the upper ends of the second brace 40 and the joint 16 between the column 12 and the beam 13 have the same joint structure. An example of the joint structure between the upper end of the first brace 30 and the joint 15 between the column 11 and the beam 13 will be described below.

[0041] As shown in FIGS. 1, 3(a), and 3(b), on the upper end side portion of the web 31 of the first brace 30, a sub-flange 33 is provided at the center of the pair of flanges 32 and is parallel to the pair of flanges 32. On the other hand, as shown in FIGS. 1 and 3(c), the joint 15 between the column 11 and the beam 13 is formed in a plate shape parallel to the sub-flange 33 by a steel plate. Connecting plate portions 60 are fixed to both surfaces of the joint 15 by welding in parallel with the web 31. Then, the joint 15 and the sub-flange 33 are fastened by fastening members 62 such as bolts and nuts using a connecting plate 61 (in FIGS. 1 and 3, only one part of the fastening member 62 is labeled for convenience), and the connecting plate portion 60 and the web 31 are fastened by fastening members 62 such as bolts and nuts using a connecting plate 61 (in FIGS. 1 and 3, only one part of the fastening member 62 is labeled for convenience). Thus, the first brace 30 is pin-jointed to the joint 15.

[0042] With such a configuration, even if the first brace 30 and the second brace 40 are used with the pair of flanges 32 and 42 positioned on both horizontal sides of the webs 31 and 41, respectively, the first brace 30 and the second brace 40 can be surely joined to the joints 15 and 16 between the columns 11, 12 and the beam 13 with a simple configuration.

[0043] In FIG. 4, as a modified example of the connection structure for connecting the second brace 40 to the joint 16, the connection between the upper end of the first brace 30 and the joint 15 between the column 11 and the beam 13, and the connection between the upper end of the second brace 40 and the joint 16 between the column 12 and the beam 13 are such that web joints 63 parallel to the webs 31, 41 of the first brace 30 to the second brace 40 are provided on both sides of the joints 15, 16, and a pair of flange connection parts 64 parallel to the pair of flanges 32, 42 of the first brace 30 to the second brace 40 are provided on both sides of the web joint 63. The pair of flanges 32, 42 and the corresponding pair of flange connection parts 64 are fastened with fastening members 66 such as bolts and nuts using a connection plate 65 (in FIG. 4, only one fastening member 66 is labeled for convenience), so that the first brace 30 to the second brace 40 may be pin-connected to the joints 15, 16.

[0044] The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.

[0045] For example, in the above-described embodiment, the building structure 3 of the building 2 is made of a steel frame structure, but it is not limited thereto, and other structures such as a reinforced concrete structure or a steel-reinforced concrete structure may be used.

Explanation of Reference Numerals

[0046] 1 Seismic isolation structure 2 Building 3 Building structure 10 Framework 11 Column 12 Column 13 Beam 13a Web 13b Flange 14 Beam 14a Web 14b Flange 15 Joint 16 Joint 17 Mounting part 18 Mounting part 19 Slider 20 Horizontal member 21 Web 22 Flange 30 First Brace 30a Body Part 30b Mouth Part 30c Connection Plate 30d Fastening Member 31 Web 32 Flange 33 Sub - flange 40 Second Brace 40a Body Part 40b Mouth Part 40c Connection Plate 40d Fastening Member 41 Web 42 Flange 50 Damper 51 Cylinder Part 52 Plunger Part 60 Connection Plate Part 61 Connection Plate 62 Fastening Member 63 Web Joint 64 Flange Connection 65 Connection Plate 66 Fastening Member

Claims

1. A seismic isolation structure provided in a framework composed of a pair of columns and a pair of beams, A horizontal member formed of H-shaped steel and horizontally disposed between one of the beams and the other beam, A first brace formed of H-shaped steel, one end of which is joined to the joint between one of the columns and one of the beams and the other end of which is joined to the horizontal member, A second brace formed of H-shaped steel, one end of which is joined to the joint between the other column and one of the beams and the other end of which is joined to the horizontal member, Dampers provided on at least one of the spaces between one of the columns and the horizontal member and between the other column and the horizontal member, and having, The horizontal member, the first brace, and the second brace are each in a posture parallel to the plane formed by the columns and the beams with a pair of flanges, A pair of flanges of the first brace and a pair of flanges of the second brace are each joined to the corresponding flange of the horizontal member. A seismic isolation structure characterized by this.

2. The seismic isolation structure according to claim 1, wherein the horizontal member, the first brace, and the second brace are formed of H-shaped steel of the same size.

3. The first brace and the second brace each have sub-flanges located at the center of a pair of the flanges and parallel to the pair of flanges, The joint is formed in a plate shape parallel to the sub-flange by a steel plate, Connection plate portions parallel to the webs of the braces connected to the joint are fixed to both surfaces of the joint, The joint and the sub-flange are fastened with a fastening member using a connection plate, and the web of the brace having the sub-flange and the connection plate portion are fastened with a fastening member using a connection plate. The seismic isolation structure according to claim 1 or 2.

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