JP2006207144A - Seismic response control frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase both a strength and a seismic response control performance by preventing excessive stress from occurring at brace joining parts even if two types of braces with different characteristics are incorporated in a seismic response control frame. <P>SOLUTION: The seismic response control brace 2 having a viscoelastic damper 5 is disposed on one of the diagonal lines of a framework frame 1, and the buckling arresting brace 3 formed of a steel material brace is disposed on the other. A hole 6 is formed at the center of the seismic response control brace 2 and the buckling arresting brace 3 is inserted into the hole 6 and these braces are crossed each other. The crossed part of these braces are connected to each other by inserting a pin 7 into these both braces. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seismic control frame that can be used as a load-bearing wall by incorporating a brace into a steel frame frame for a house.

Braces are attached to residential steel frame frames used as wall surfaces to increase strength and improve vibration control characteristics. As a load-bearing frame designed to increase the strength as described above, for example, as shown in Patent Document 1, a buckled steel brace is arranged so as to intersect, and only the tensile force is applied to increase the strength. is there.
In addition, as a seismic control frame with improved seismic control characteristics, a brace (viscoelastic brace) provided with a viscoelastic damper is arranged in place of the steel brace described above, so that vibration is quickly damped. There are some (see, for example, Patent Document 2).

By using both the load-bearing frame and the vibration control frame configured as described above, it is possible to improve both the rigidity and the vibration control performance. There is a limit to the installation location of the housing, and if the vibration control frame is assembled to a part of the load-bearing frame installation location in order to improve the vibration damping performance, the earthquake resistance strength of the house will decrease.
For this reason, there has been proposed a vibration control frame that combines two types of braces, a steel brace and a viscoelastic brace, to coexist in a single frame to achieve both strength and vibration damping (for example, And Patent Document 3). This is a configuration in which a buckling-restrained steel brace (buckling-restraining brace) and a viscoelastic brace, which are difficult to bend, are assembled on one shaft frame.

JP 09-296562 A JP 11-256870 A JP 2001-173265 A

However, when vibration is generated in a house equipped with the vibration control frame structure of the cited reference 3, or when stress is applied to the vibration control frame structure, the behavior of the buckling restraint brace and the viscoelastic brace is different. In addition, since both joint portions on the shaft frame overlap each other, excessive stress due to force imbalance occurs at the joint portion, and the shaft frame is easily bent around the joint portion.
Therefore, in view of such problems, the present invention does not generate excessive stress at the brace joint even when two types of braces having different characteristics are incorporated, and improves both strength and vibration control performance. The purpose is to provide the seismic control frame.

In order to solve the above-mentioned problems, the invention according to claim 1 is a seismic control frame structure in which a brace is arranged on a housing frame comprising columns and beams, and the brace is a diagonal line of the frame. A pair of the braces are arranged on the upper side, and one of the braces is a seismic control brace for damping, and the other brace is a buckling-restrained brace for strength.
With this configuration, even if braces with different vibration characteristics are installed on the same frame, there will be no excessive stress at the joint between the frame and the brace. It is possible to achieve both.

The invention according to claim 2 is a seismic control frame structure in which braces are arranged in an X-shape on a housing frame consisting of columns and beams, and the X-shaped braces are arranged in two upper and lower stages in the frame. One of the braces constituting the X-shape is a vibration-control brace for vibration control, and the other brace is a buckling-restrained brace for load-bearing. A seismic control frame characterized by
With this configuration, even if braces with different vibration characteristics are installed on the same frame, there will be no excessive stress at the joint between the frame and the brace. It is possible to achieve both. In addition, by providing the braces in two stages, the brace works well on a vertically long frame frame, and high rigidity can be maintained.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the buckling restrained brace is a steel brace.
With this configuration, the rigidity of the frame can be further increased, and it can be used favorably as a bearing wall of a house.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the crossing portion of the brace crosses the other brace by inserting the other brace into the hole provided in the one brace. Both braces are connected by pins.
With this configuration, the thickness of the intersecting portion does not increase, and the intersected braces can be accommodated in the thickness of one wall. Moreover, the strength of the braces can be increased by connecting the braces to each other at the intersection.

According to a fifth aspect of the present invention, in the invention according to any one of the first to third aspects, the brace crossing portion is arranged by connecting a metal plate by dividing the brace into two parts, and connecting the individual braces from the metal plate. The seismic control frame structure according to any one of claims 1 to 3, wherein X-shaped braces are arranged radially.
With this configuration, there is no need to make a hole in the center of one brace, and there is no need to make the other brace thinner, and the strength of both braces can be increased. In addition, the crossing portion can be made thin, and the braces that cross each other can be accommodated in the thickness of one wall.

As described above, according to the present invention, braces having different vibration characteristics are not joined to the same part of the frame frame, so that an excessive stress is not applied to the joint part of the frame frame and the brace. It is possible to achieve both strength enhancement and vibration control on a frame-by-frame basis.
And by making one brace into a buckling-restrained brace, it can be used for a frame frame that forms a bearing wall of the frame frame for a house, and it is possible to increase the rigidity and effectively control the vibration.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing a first embodiment of a vibration control frame according to the present invention, wherein 1 is a frame frame composed of columns 1a and beams 1b, 2 is a vibration control brace, and 3 is a buckling restrained brace. ing. Both braces are installed on different diagonals of the frame 1 and intersect at the center to be arranged in an X shape. This intersection is shown in FIG. Reference numeral 1 c denotes a middle rail of the frame assembly 1.

The vibration control brace 2 is composed of a viscoelastic brace including a cylindrical viscoelastic damper 5 formed by sandwiching a viscoelastic body 4 between an outer cylinder 12a and an inner cylinder 12b, and the viscoelastic damper 5 is excluded from the center. Are provided symmetrically in the longitudinal direction. Further, the buckling restrained brace 3 is a steel brace made of a metal rod formed in a cylindrical shape, and is formed firmly for strength. As shown in the front explanatory view of FIG. 2 (a), the brace intersection is provided with a hole 6 through which the buckling restrained brace 3 is inserted in the center of the vibration control brace 2. The restraint brace 3 is inserted and crossed.
Further, as shown in the cross-sectional explanatory view along the central axis of the vibration control brace 2 in FIG. 2B, a pin 7 penetrating both braces 2 and 3 is attached to the intersection of the braces 2 and 3. Yes. The pin 7 is provided in a direction perpendicular to both the braces 2 and 3, and both the braces 2 and 3 are connected so as to be rotatable in a plane formed by the shaft frame 1.
The buckling restrained brace 3 is formed with a diameter that can be inserted into the hole 6 formed in the vibration control brace 2.

  On the other hand, the shaft frame 1 is connected to each brace by welding the brace end to a joining plate 8 provided at the corner of the shaft frame 1. The intermediate rail 1c is installed in the lateral direction so as not to interfere with both braces 2 and 3.

In this way, by arranging viscoelastic braces and steel braces with different behaviors during vibration in an X-shape, both braces are not joined at the same part of the frame frame, and the frame frame and brace As a result, excessive stress is not generated at the joint portion, and it is possible to achieve both strength enhancement and vibration control on a frame-by-frame basis. And by incorporating a buckling-restrained brace, it is possible to increase the rigidity and effectively control the vibration, and by using the buckling-restraining brace as a steel brace, it can be used favorably as a bearing wall of a house.
In addition, since one brace is inserted through the other brace and intersected, the thickness of the brace intersecting portion does not increase, and the intersected brace can be accommodated in the thickness of one wall, and the pin can be pinned at the intersecting portion. By connecting the braces to each other, it is possible to prevent buckling of the vibration control brace.

  Incidentally, the crossing portion may be provided with a hole 6 on the buckling restraint brace 3 side, and the vibration control brace 2 may be inserted. FIG. 3 shows the brace crossing portion in such a configuration, (a) Front view, (b) shows a cross section with the central axis of the buckling restrained brace as a cross section. In this case, as shown in this figure, the viscoelastic damper 5 of the damping brace 2 can be provided continuously, and a simple structure can be achieved. Further, the damping brace 2 may use a plate-like viscoelastic damper in which a plate-like viscoelastic body is sandwiched between steel plates, and the buckling-restrained brace 3 is a rectangular column having a square section. You can also. And if both are connected by the pin 7, it can be made mutually robust like the said embodiment.

FIG. 4 shows a second embodiment of the present invention. In FIG. 4, 10 is a vibration control brace and 11 is a buckling restrained brace, and both braces have the same configuration as in the first embodiment. Further, as in the first embodiment, the crossing portion is also provided with a hole 6 in the vibration control brace 10 so as to pass through the buckling restraint brace 11, and the crossing portion is connected by a pin 7.
And the braces arranged in an X shape are provided in two upper and lower stages, the same braces are arranged in a square shape, and the upper and lower axes are symmetrical about the middle rail 1c.

  In this way, by forming the X-shaped braces in two stages, the X-shaped brace works well even with a vertically long frame frame, and the rigidity does not deteriorate. In addition, since braces having different vibration characteristics are not joined to the same part of the frame frame, the strength is increased and the vibration is controlled on a frame-by-frame basis without applying excessive stress to the joint between the frame frame and the brace. It is possible to achieve both.

  5A and 5B show another example of the vibration control frame according to the present invention, in which FIG. 5A is a modified example of FIG. 1 in which one set of braces is arranged on the diagonal of the frame frame, and FIG. The modification of FIG. 4 which has arrange | positioned two pairs up and down in the shape of a character is shown. In both cases, metal plates 13a and 13b are arranged at the intersection, and one end of the vibration control braces 2a and 10a and buckling restrained braces 3a and 11a arranged in the same manner as in the above embodiment is connected to the metal plates 13a and 13b. I am letting. However, as shown in the figure, braces that are approximately half the length of the above embodiment are used and are arranged radially from the metal plates 13a and 13b, and the connecting portions of the metal plates 13a and 13b and each brace are welded. .

  Thus, without crossing both directly, metal plates or the like may be arranged and crossed, there is no need to open a hole through which the other of one brace is inserted, and there is no need to narrow the other brace, The strength of both braces can be increased. In addition, the crossing portion can be made thin, and the braces that cross each other can be accommodated in the thickness of one wall.

FIGS. 6 to 9 show still other examples of the seismic control frame according to the present invention, and all show the case where the same high-strength seismic control braces 16 (16a to 16d) are crossed. Yes. However, FIG. 7 is an explanatory diagram of the intersection of FIG. As described above, even if the buckling restrained brace is not used, it is possible to perform a good vibration control operation while maintaining the strength by using the vibration control brace having a high buckling strength. It is applicable to the configuration of
Conversely, a pair of braces can be composed of steel braces, and one is used for strength-bearing with a high yield limit and the other is used for seismic control with a low yield limit. be able to.

  In the above embodiment, the vibration control braces 2, 2a, 10, 10a, 16 are constituted by viscoelastic braces having only viscoelastic dampers, but the friction dampers are arranged in series with the viscoelastic dampers. A vibration-damping brace may be configured by assembling both a viscoelastic damper and a friction damper to one brace. By doing so, it is possible to prevent the viscoelastic body from being broken if the friction damper functions (slides out) with a certain force or more.

It is a front view which shows 1st Embodiment of the seismic control frame which concerns on this invention. It is explanatory drawing of the brace crossing part of FIG. 1, (a) is a front view, (b) is explanatory drawing cut | disconnected by the central axis of one brace. It is explanatory drawing which shows the other structure of a brace crossing part, (a) is a front view, (b) is It is a front view which shows 2nd Embodiment of the seismic control frame which concerns on this invention. It is explanatory drawing cut | disconnected by the center axis | shaft of one brace. It is explanatory drawing which shows the other example of the seismic control frame which concerns on this invention, (a) has a case where it has one set of X-shaped braces, (b) has shown the case where it has two sets of X-shaped braces. . It is a front view which shows the further another example of the seismic control frame which concerns on this invention. It is explanatory drawing of the brace crossing part of FIG. 6, (a) is a front view, (b) is explanatory drawing cut | disconnected by the central axis of one brace. It is a front view which shows the further another example of the seismic control frame which concerns on this invention. It is a front view which shows the further another example of the seismic control frame which concerns on this invention.

Explanation of symbols

  1. Frame frame, 1a ... Column, 1b ... Beam, 2a ... Damping brace, 3, 3a ... Buckling restraint brace, 4 ... Viscoelastic body, 5 ... Viscoelastic damper, 6 .... hole, 7 ... pin, 10, 10a ... vibration control brace, 11, 11a ... buckling restrained brace, 13a, 13b ... metal plate, 16 ... vibration control brace.

Claims (5)

It is a seismic control frame structure in which braces are arranged on a housing frame consisting of columns and beams, and the braces are arranged in a pair on the diagonal of the frame, and one brace is used for vibration control. A seismic brace, wherein the other brace is a buckling-restrained brace for strength. It is a vibration control frame structure in which braces are arranged in an X-shape on a housing frame consisting of columns and beams, and the X-shaped braces are arranged in two upper and lower stages in the frame. One of the braces is a seismic control brace for seismic control, and the other brace is a buckling-restrained brace for load-bearing. The same type of braces are arranged symmetrically in the vertical axis and formed in two stages. Seismic frame. The seismic control frame according to claim 1 or 2, wherein the buckling-restrained brace is a steel brace. The crossing portion of the brace is formed by inserting the other brace into a hole provided in one brace and crossing the holes, and connecting both braces with pins at the crossing portion. Seismic control frame. The crossing portion of the brace comprises an X-shaped brace formed by arranging a metal plate and connecting the brace by dividing the brace into two, and arranging individual braces radially from the metal plate. The listed vibration control frame.

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