JP2019019641A - Anti-seismic structure, vibration damping mechanism and brace member - Google Patents

Abstract

To provide an earthquake resistant structure, a vibration damping mechanism and a brace member which can provide an earthquake resistant structure even in a narrow space and can reduce eccentric force.SOLUTION: An earthquake-resistant structure 15 is arranged in a space surrounded by pillars and beams. The earthquake-resistant structure 15 includes a frame portion 20 and a vibration damping mechanism D1. The vibration damping mechanism D1 includes a friction damper 30 and an oil damper 40. A hole 37 is formed in the central portion of the H-shaped steel 31 of the friction damper 30. A piston rod 45 of the oil damper 40 is inserted into a hole 37 of the friction damper 30, and the friction damper 30 and the oil damper 40 are arranged to intersect so that the center axis C1 of the friction damper 30 and the center axis C2 of the oil damper 40 are in the same plane.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an earthquake-resistant structure of a building, a vibration damping mechanism, and a brace member.

  Conventionally, in order to improve the earthquake resistance of a building, a brace member may be attached to a column beam frame. The brace member is disposed obliquely with respect to the space surrounded by the columns and beams. Since the brace member can suppress the deformation of the joint between the column and the beam, the structural strength can be increased.

  Also, friction dampers are known that are displacement-dependent damping members that use frictional forces to absorb earthquake energy and reduce building vibration (for example, Non-Patent Documents 1 and 2 and Patent Document 1). , 2). The friction dampers described in Non-Patent Document 1 and Patent Documents 1 and 2 describe a brace-type friction damper in which a stainless plate and a brake material are tightened with bolts via a disc spring. Non-Patent Document 2 describes a friction damper in which a new type is combined on the upper and lower surfaces of an H-shaped steel frame and a conventional type is combined on the side surface. Further, here, two brace-type friction dampers are arranged side by side in the same space.

  When a brace or a damper is disposed in a narrow opening, the brace or the damper may be disposed so as to intersect (see, for example, Patent Documents 3 and 4). Patent Document 3 shows a configuration in which a brace of a cross having an intersection released is provided in a column beam frame of a building structure, and an oil damper that expands and contracts in the axial direction of the brace is attached. Patent Document 4 shows a configuration in which an earthquake-resistant brace and a viscous damping damper are arranged so as to intersect each other.

JP2015-113955A Japanese Patent Application Laid-Open No. 2015-197188 JP-A-9-195567 JP 2011-42974 A

“Service and technology, high-performance, low-cost vibration suppression system, brake damper, which suppresses the shaking of the building so as to brake the vehicle”, Obayashi, [online], [Search May 8, 2017], Internet, <URL : Https://www.obayashi.co.jp/service_and_technology/related/tech004> 2013.03.08 press release, “Establishing a building vibration control system with abundant variations by adding two new types to“ Brake damper ””, Obayashi, [online], [Search July 10, 2017], Internet, <URL: http://www.obayashi.co.jp/press/news20130308_01>

  In patent documents 3 and 4 mentioned above, a brace and a damper can be arranged in the same space. However, it is necessary to avoid the interference in the depth direction between the brace and the damper. For this reason, when the space in the depth direction is narrow, it is difficult to attach the brace and the damper. In addition, when the axes of the brace and the damper are displaced, an eccentric force due to the displacement may occur.

  The earthquake-resistant structure for solving the above problems includes a first brace member disposed obliquely in a space surrounded by columns and beams, and a second brace member disposed so as to intersect the first brace member. In the earthquake-resistant structure provided, at least one of the first brace member and the second brace member is a vibration damping member, and the second brace member is included in a plane including the central axis of the first brace member. Arranged to be. Thereby, since a part of 1st brace member and 2nd brace member can overlap and arrange | position in the depth direction orthogonal to the opening part of space, the attachment space of a depth direction can be made small. Furthermore, since the vertical plane including the central axis of the first brace member and the vertical plane including the central axis of the second brace can be brought close to each other, the eccentric force due to the displacement of the central axes of the first and second brace members can be reduced. Can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, an earthquake-resistant structure can be provided in a narrow space and eccentric force can be reduced.

It is a figure explaining the seismic structure of 1st Embodiment, Comprising: (a) is a front view, (b) is sectional drawing in the 1B-1B line. The perspective view of the earthquake-resistant structure of 1st Embodiment. It is sectional drawing in 1st Embodiment, Comprising: (a) is sectional drawing in the 3A-3A line, (b) is sectional drawing in the 3B-3B line. It is a figure explaining the earthquake-resistant structure of 2nd Embodiment, Comprising: (a) is a front view, (b) is sectional drawing in the 4B-4B line. The expansion perspective view which shows the reinforcement part of the friction damper of the earthquake-resistant structure in the example of a change. It is a figure explaining the earthquake-proof structure in a modification, Comprising: (a) is a front view, (b) is sectional drawing in the 6B-6B line.

<First Embodiment>
Hereinafter, a first embodiment in which an earthquake resistant structure, a vibration damping mechanism, and a brace member are embodied will be described with reference to FIGS. This embodiment demonstrates as an earthquake-resistant structure which performs earthquake-proof reinforcement with respect to the existing building comprised with reinforced concrete or steel-framed reinforced concrete.

As shown in FIG. 1A and FIG. 1B, a seismic structure 15 is provided on the column beam frame of the building. Specifically, the earthquake-resistant structure 15 is arranged in a space S1 surrounded by the pillars 11 of the building and the beams 12.
As shown in FIGS. 1 and 2, the earthquake-resistant structure 15 includes a frame portion 20 and a vibration damping mechanism D <b> 1 disposed in the frame portion 20. The frame portion 20 includes a ceiling portion 21, a floor portion 22, and both side wall portions 23 and 24 made of H-shaped steel. By attaching these parts (21 to 24) to the column beam frame (between the columns 11 of the building and the beam 12) facing the space S1, the frame unit 20 is attached to the space S1 to reinforce the column beam frame of the building. In addition, you may comprise each part (21-24) of the frame part 20 with members other than H-section steel.

  A vibration damping mechanism D1 is attached to the space S1. The vibration damping mechanism D1 includes a friction damper 30 and an oil damper 40. Specifically, both ends of the friction damper 30 are attached to the diagonal of the frame portion 20. Further, both ends of the oil damper 40 are attached to the other diagonal of the frame portion 20. For this reason, the friction damper 30 and the oil damper 40 intersect in the vicinity of the center of the space S1.

  The friction damper 30 suppresses relative movement by the frictional force between the sliding pressure plates. For example, a brake damper (registered trademark) can be used as the friction damper 30. In the present embodiment, the friction damper 30 is configured by attaching a braking mechanism 35 to an H-section steel 31 downward.

  Further, a square hole 37 is formed in the web 31 </ b> W at the center of the H-shaped steel 31 of the friction damper 30. A piston rod 45 of an oil damper 40 described later is passed through the hole 37. For this reason, the hole 37 is formed to have a size larger than the diameter of the piston rod 45 and to allow the oil damper 40 to be displaced.

  Around the hole 37, reinforcing ribs 38 are provided on both sides of the web 31W. The reinforcing rib 38 is reinforced by surrounding the hole 37 with a lattice (well shape). The reinforcing rib 38 is formed with a size that does not interfere with the movement of the oil damper 40.

3A is a cross-sectional view taken along line 3A-3A in FIG. 1, and FIG. 3B is a cross-sectional view taken along line 3B-3B in FIG.
As shown in FIG. 2, FIG. 3A and FIG. 3B, the reinforcing rib 38 includes two first rib portions 38a parallel to the flange 31F and two first rib portions 38a orthogonal to the first rib portion 38a. It is comprised by the 2 rib part 38b.

On the other hand, the oil damper 40 shown in FIGS. 1 and 2 includes a cylinder 41, a mounting portion 42 fixed to the lower end portion of the cylinder 41, and a piston rod 45. The piston rod 45 of the oil damper 40 is inserted into the hole 37 of the H-shaped steel 31 of the friction damper 30.
In the present embodiment, as shown in FIG. 1B, the central axis C1 of the friction damper 30 and the central axis C2 (of the piston rod 45) of the oil damper 40 are arranged in the same vertical plane.

<Operation>
Next, operation | movement of the earthquake-resistant structure 15 is demonstrated using FIG.
In the case of a small-scale earthquake with small acceleration and displacement, the friction damper 30 and the oil damper 40 function as braces. Accordingly, the deformation of the column beam frame (building) is suppressed by the compressive tensile force of the friction damper 30 and the oil damper 40 against the horizontal force applied to the column beam frame in the space S1.

  In the case of a medium-scale earthquake with high acceleration and small displacement, the friction damper 30 functions as a brace, and the oil damper 40 functions as a viscous damping member. Thereby, the deformation of the column beam frame (building) is suppressed by the friction damper 30. At the same time, the seismic energy of the building is absorbed by the resistance of the oil (viscous material) according to the relative speed between the cylinder 41 and the piston rod 45 of the oil damper 40 to perform vibration suppression.

  In the case of a large-scale earthquake with large acceleration and displacement, the friction damper 30 functions as a hysteresis damping member, and the oil damper 40 functions as a viscous damping member. Accordingly, the seismic energy of the building is absorbed by the resistance of the oil corresponding to the relative speed of the oil damper 40 and the frictional force of the friction damper 30 to perform vibration suppression.

According to this embodiment, the following effects can be obtained.
(1-1) In the present embodiment, the friction damper 30 and the oil damper 40 are arranged so as to intersect with each other so that the center axis C1 of the friction damper 30 and the center axis C2 of the oil damper 40 are in the same plane. Thereby, the width | variety (depth direction) of space S1 which arrange | positions the friction damper 30 and the oil damper 40 can be made small. Furthermore, when energy is absorbed by the dampers (30, 40), the eccentric force due to the displacement between the center axis C1 of the friction damper 30 and the center axis C2 of the oil damper 40 can be reduced.

  (1-2) According to the present embodiment, the vibration damping mechanism D1 includes the friction damper 30 and the oil damper 40. Thereby, according to the magnitude | size of an earthquake, each damper (30, 40) can be functioned as a brace, a viscous damping member, and a friction damping member.

  (1-3) According to the present embodiment, the hole 37 is formed in the web 31 </ b> W at the center portion of the friction damper 30, and the piston rod 45 of the oil damper 40 is passed through the hole 37. Thereby, the central axis C1 of the friction damper 30 and the central axis C2 of the oil damper 40 can be arranged in the same plane.

(1-4) According to the present embodiment, the reinforcing rib 38 is provided around the hole 37 of the H-shaped steel 31 of the friction damper 30. Thereby, the circumference | surroundings of the hole 37 can be reinforced.
(1-5) According to this embodiment, the earthquake-resistant structure 15 has the frame part 20 attached to a column beam frame. Accordingly, the friction damper 30 and the oil damper 40 can be efficiently attached in the opening space of the column beam frame, and the column 11 and the beam 12 can be further reinforced.

<Second Embodiment>
Next, a second embodiment that embodies an earthquake resistant structure, a vibration damping mechanism, and a brace member will be described with reference to FIG. Since this embodiment has a configuration in which two vibration damping structures of the first embodiment are combined, the same parts as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 4A is a front view of the second embodiment, and FIG. 4B is a cross-sectional view taken along line 4B-4B of FIG. 4A.
As shown in FIG. 4A, in the present embodiment, an earthquake resistant structure 65 is disposed in a space S2 surrounded by the pillar 61 and the beam 62. The space S2 of the present embodiment is a space having a longer lateral width than the space S1 of the first embodiment. The earthquake-resistant structure 65 includes a frame portion 70 and two vibration damping mechanisms D1. The frame part 70 includes a ceiling part 71, a floor part 72, and both side wall parts 73 and 74. By attaching these parts (71 to 74) to the column beam frame (between the column 61 of the building and the beam 62) facing the space S2, the frame unit 70 is attached to the space S2 to reinforce the column beam frame of the building. Furthermore, an intermediate mounting portion 75 is formed in the center of the ceiling portion 71 in the frame portion 70 of the present embodiment.

  Two vibration damping mechanisms D1 are mounted side by side in the space S2 in the frame portion 70. Specifically, both end portions of the oil damper 40 of each vibration damping mechanism D1 are attached to both end portions of the floor portion 72 of the frame portion 70 and the intermediate attachment portion 75. Thereby, the two oil dampers 40 are arranged in an inverted V shape.

  Furthermore, both ends of the friction damper 30 of each vibration damping mechanism D1 are attached to both end portions of the ceiling portion 71 of the frame portion 70 and an intermediate portion of the floor portion 72. Accordingly, the two friction dampers 30 are arranged in a V shape. And the friction damper 30 and the oil damper 40 of each vibration damping mechanism D1 are arrange | positioned so that it may cross | intersect.

In the friction damper 30 of the present embodiment, the braking mechanism 35 is provided in the H-section steel 31 above the position where the oil damper 40 intersects.
As shown in FIG. 4B, the center axis C1 of the friction damper 30 and the center axis C2 of the oil damper 40 of each vibration damping mechanism D1 are all arranged in the same vertical plane.

According to the present embodiment, in addition to the same effects as (1-1) to (1-5) described in the first embodiment, the following effects can be obtained.
(2-1) In this embodiment, two vibration damping mechanisms D1 are mounted side by side in the space S2 surrounded by the pillar 61 and the beam 62. Thereby, also in space S2 with wide width, the function of each damper (30, 40) can be exhibited efficiently.

Further, the above embodiments may be modified as follows.
In the friction damper 30 of each of the above embodiments, a lattice-shaped reinforcing rib 38 that reinforces the periphery of the hole 37 is provided. The structure of the reinforcing member that reinforces the periphery of the hole that penetrates the second brace member (oil damper 40) is not limited thereto.
For example, as shown in FIG. 5, a steel aggregate 80 having a web in which a portion 88 around the hole 87 is expanded may be used as a friction damper used in place of the H-section steel 31.

  In each of the above embodiments, the hole 37 formed in the friction damper 30 is formed in a square shape. The shape of the engaging portion that engages with the piston rod 45 of the oil damper 40 that is the second brace member is not limited thereto. For example, it may be a long hole or a circular hole in FIG. Further, the second brace member may be formed in a groove that is partially opened instead of being surrounded by a hole.

  In the vibration damping mechanism D1 of each of the above embodiments, the friction damper 30 is used as the displacement-dependent damping member, and the oil damper 40 is used as the viscous damping member. The deformation-dependent damping member and the viscous damping member used for the vibration damping mechanism D1 are not limited to these. For example, other deformation-dependent damping members such as double steel pipe braces, damping members using viscous materials other than oil, and viscoelastic damping members such as unbonded braces (registered trademark) can be used.

  Moreover, in each said embodiment, the cylinder 41 of the oil damper 40 was provided in the downward position rather than the crossing position. The arrangement positions of the cylinder 41 of the oil damper 40 and the braking mechanism 35 of the friction damper 30 are not limited, and may be provided either above or below the intersection position.

  In each of the above embodiments, the friction damper 30 and the oil damper 40 are used as the vibration damping mechanism D1. At least one of the vibration damping mechanisms D1 may be a vibration damping member. For example, in the vibration damping mechanism D1, the friction damper 30 or the oil damper 40 and the brace member may be arranged so as to intersect each other. Furthermore, the same type of damper may be used as the vibration damping mechanism D1. When the oil dampers 40 intersect each other, an engaging portion (for example, a hole or the like) for engaging (penetrating) the other piston rod is formed in the central portion of one piston rod.

  In each of the above embodiments, the hole 37 is formed in the friction damper 30, and the oil damper 40 is passed through the hole 37. The crossing method is not limited to holes. For example, the piston rod 45 of the oil damper 40 may have a shape that bypasses the friction damper 30 (for example, a shape provided with a curved bypass portion at the intersection position). In this case, by arranging the friction damper 30 in the bypass portion of the piston rod 45 of the oil damper 40, the center axis C1 of the friction damper 30 and the center axis C2 of the oil damper 40 can be made flush with each other.

The first brace member and the second brace member are disposed in the square space S1 in the first embodiment and the horizontally long space S2 in the second embodiment. The shape of the space in which the braces are arranged is not limited to these. For example, you may apply to the vertically long space where the space | interval of pillars is narrow.
In the above embodiments, the vibration damping mechanism D1 is provided in an existing building made of reinforced concrete or steel reinforced concrete. The object to be reinforced is not limited to buildings including reinforced concrete, and may be provided in buildings made of steel frames.
In this case, as shown in FIGS. 6A and 6B, the vibration damping mechanism D1 may be directly attached to the steel member of the building without using the frame portion. Specifically, both ends of the friction damper 30 and the oil damper 40 of the vibration damping mechanism D1 of the earthquake-resistant structure 95 having no frame portion are attached to the corners of the pillar 91 and the beam 92 of the building.

  In each of the above embodiments, the friction damper 30 and the oil damper 40 are arranged so that the center axis C1 of the friction damper 30 and the center axis C2 of the oil damper 40 are included in the same vertical plane. The arrangement is not limited to the arrangement in which the central axes of both brace members are included in the same vertical plane, and it is only necessary that the second brace member is included in the plane including the central axis of the first brace member. In this case, even if the vertical surfaces are not the same, a part of the first brace member and the second brace member can be overlapped in the depth direction, so that the space in the depth direction can be reduced.

  C1, C2 ... central axis, D1 ... vibration damping mechanism, S1, S2 ... space, 11, 61, 91 ... pillar, 12, 62, 92 ... beam, 15, 65, 95 ... earthquake resistant structure, 20, 70 ... frame part 21, 71 ... Ceiling part, 22, 72 ... Floor part, 23, 24, 73, 74 ... Side wall part, 30 ... Friction damper, 31 ... H-shaped steel, 31F ... Flange, 31W ... Web, 35 ... Braking mechanism, 37, 87 ... holes, 38 ... reinforcing ribs, 38a ... first rib part, 38b ... second rib part, 40 ... oil damper, 41 ... cylinder, 42 ... mounting part, 45 ... piston rod, 75 ... intermediate mounting part, 80 ... steel frame, 88 ... part.

Claims (7)

A first brace member disposed obliquely in a space surrounded by columns and beams;
In the earthquake-proof structure provided with the 2nd brace member arranged crossing the 1st brace member,
At least one of the first brace member and the second brace member is a vibration damping member,
An earthquake-resistant structure, wherein the second brace member is disposed in a plane including the central axis of the first brace member.   The earthquake-resistant structure according to claim 1, wherein the central axis of the first brace member and the central axis of the second brace member are provided in the same plane.   The earthquake-resistant structure according to claim 1 or 2, wherein the second brace member is passed through a hole provided in the first brace member.   The earthquake-resistant structure according to claim 3, wherein the first brace member is provided with a reinforcing member around the hole. One of the first brace member and the second brace member is a viscous damping member,
The earthquake-resistant structure according to any one of claims 1 to 4, wherein the other of the first brace member and the second brace member is a displacement-dependent damping member. A vibration damping mechanism comprising a first brace member and a second brace member disposed to intersect the first brace member,
At least one of the first brace member and the second brace member is a vibration damping member,
A vibration damping mechanism, wherein the second brace member is disposed in a plane including a central axis of the first brace member. A brace member arranged to intersect with other brace members,
A brace member characterized in that a hole for penetrating the other brace member is formed.

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