JP2008019632A - Buckling stiffening brace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buckling stiffening brace capable of facilitating construction and control of a clearance. <P>SOLUTION: Rib plates 20A, 20B, 20C, 20D are fixed from an external face of a brace member 16 toward the outward direction and are worked in advance in such a way that the dimension of a clearance C1 in the vertical direction among a steel pipe 18 and them and the dimension of a clearance C2 in the right and left directions become predetermined values. Since a clearance between the brace member 16 and an internal wall 22 of the steel pipe 18 is adjusted by the rib plates 20 in this way, construction of the buckling stiffening brace 10 and control of the clearances become easy. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a buckling stiffening brace used as a seismic element for a structure.

  Conventionally, seismic technology that uses steel brace material to reinforce structures such as buildings has been used, but when steel brace material is subjected to compressive force in the axial direction, deflection due to buckling occurs, resulting in steel brace. The yield strength of the material was reduced.

In order to solve the problems of steel brace materials, buckling stiffeners such as steel pipes and reinforced concrete are used to cover and reinforce the steel brace material without frictional resistance, and bending due to buckling of the steel brace material There are buckling stiffening braces that prevent deformation. (For example, see Patent Document 1)
In the buckling stiffening brace, the clearance management between the brace material and the buckling stiffening material has become a major issue. On the other hand, if the clearance is too small, the brace material expands in cross section during compression and contacts the buckling stiffener, and the compressive force is transmitted to the buckling stiffener and impairs the original function. In addition, the brace material cannot be inserted during production.

  However, in the buckling stiffening brace disclosed in Patent Document 1, when an existing brace material is used, the inner dimensions of the buckling stiffening material must be processed with high accuracy accordingly. Clearance management with stiffeners was difficult.

As a second example of the buckling stiffening brace, there is a buckling stiffening brace that adjusts the clearance between the brace material and the buckling stiffening material with a plurality of bolts screwed from the outside of the buckling stiffening material. (For example, see Patent Document 2)
However, in the buckling stiffening brace of Patent Document 2, the clearances at a plurality of locations are finely adjusted by screwing individual bolts, and a lot of construction time is required. Moreover, the head of the bolt protruded from the buckling stiffener at a plurality of locations, and the appearance of the structure was impaired.
JP-A-7-324377 JP 2000-328669 A

  The present invention has been made in view of the above facts, and an object thereof is to obtain a buckling stiffening brace that facilitates construction and clearance management.

  The invention according to claim 1 is erected in an outward direction from a brace material disposed obliquely into the construction surface, a stiffening cylindrical body extrapolated to the brace material, and an outer peripheral edge of the brace material, And a plurality of adjusting members for adjusting a clearance with the inner wall of the stiffening cylindrical body.

  According to the above configuration, since the clearance between the brace material and the inner wall of the stiffening cylindrical body is adjusted by the adjusting member provided upright from the brace material, it can be constructed while visually confirming, and clearance management becomes easy.

  Further, since the adjustment member is inside the stiffening cylinder, the appearance of the buckling stiffening brace is good.

  The invention described in claim 2 is characterized in that a plurality of the adjusting members are provided in the axial direction of the brace material.

  According to the above configuration, since the adjustment member is provided in a plurality of locations in the axial direction of the brace material, the deformation mode of the brace material can be set to a secondary or higher deformation mode. Deformation prevention ability is improved.

  The invention described in claim 3 is characterized in that the adjusting member is a rib plate.

  According to the above configuration, it is only necessary to fix the rib plate to the brace material by welding or the like, so that the buckling stiffening brace can be easily constructed.

  Since the present invention has the above-described configuration, the construction of the buckling stiffening brace and the clearance management are facilitated.

  An embodiment of a buckling stiffening brace of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a frame 13 is formed by a steel beam member 12 and a column member 14, and buckling stiffening braces 10 are obliquely attached to the frame 13 at two locations.

  The buckling stiffening brace 10 includes a brace material 16 and a steel pipe 18 that is externally inserted into the brace material 16.

  As shown in FIGS. 1 and 2, the brace material 16 is H-shaped steel, and one end is fixed to the central portion 17 of the beam member 12 by a fixing means such as a bolt and a nut (not shown), and the other end is The beam member 12 and the column member 14 are fixed to the corner 15 where they intersect.

  In this attached state, an axial force is applied to the brace material 16 when the frame 13 is deformed by an earthquake or the like.

  As shown in FIGS. 2 and 3, rib plates 20A, 20B, 20C, and 20D are erected from the outer surface of the brace material 16 outward at three locations in the axial direction of the brace material 16. .

  The rib plates 20A, 20B, 20C, and 20D are processed in advance with predetermined dimensions so that the clearance C1 in the vertical direction and the clearance C2 in the horizontal direction with the steel pipe 18 have predetermined values. It is fixed to the material 16.

  The clearances C1 and C2 differ depending on the size and material of the brace material 16 and the steel pipe 18 to be used, but have a value of several millimeters in this embodiment.

  On the other hand, the steel pipe 18 is a steel material formed in a square tube shape, and the buckling stiffening brace 10 is formed by inserting the brace material 16 in the arrow Z direction.

  The opening of the steel pipe 18 is provided with a flange 24 projecting outward at the end, and the steel pipe 18 comes into contact with the stopper 19 attached in the vicinity of the end of the brace material 16. 18 is not offset from one end of the brace material 16.

  Next, the operation of the embodiment of the present invention will be described.

  First, the brace material 16 is manufactured according to the dimensions of the frame 13 of the structure.

  Next, a steel pipe 18 having an inner dimension larger than the outer dimension of the brace material 16 is manufactured. At this time, the clearance between the brace material 16 and the steel pipe 18 may not be considered.

  Next, the dimensions of the rib plates 20A, 20B, 20C, and 20D are determined so that the clearance with the inner wall 22 of the steel pipe 18 is several millimeters, and three sets are manufactured. The rib plates 20A, 20B, 20C, and 20D are fixed to the brace material 16 by welding.

  Next, the brace material 16 is inserted into the steel pipe 18 to form the buckling stiffening brace 10.

  The buckling stiffening brace 10 is installed obliquely on the frame 13 of the structure, and is fixed by fixing means such as bolts and nuts at the corner 15 and the center 17 (see FIG. 1).

  Here, when the frame 13 is deformed by an earthquake and a tensile force is applied to the buckling stiffening brace 10, the deformation of the frame 13 is suppressed by the tensile strength of the brace material 16.

  Further, when a compressive force is applied to the buckling stiffening brace 10, the brace material 16 tends to buckle and deform, but the steel pipe 18 suppresses the buckling deformation of the brace material 16. Buckling is prevented, and deformation of the frame 13 is suppressed by the compression strength of the brace material 16.

  As described above, the buckling stiffening brace 10 has a resistance to both a tensile force and a compressive force.

  Here, the deformation mode of the brace material 16 will be described.

  4 schematically shows a state in which the brace member 16 stretched around the corner 15 and the center portion 17 (see FIG. 1) of the frame 13 receives a compressive force F in the axial direction and is buckled and deformed from the axial center M. FIG. It is shown in.

  As shown in FIG. 4a, when the rib plate 20 (20A, 20B, 20C, 20D) is arranged only at the positions of both ends of the steel pipe 26, the buckling deformation of the brace material 16 becomes the primary deformation mode. The brace material 16 is not so resistant to compressive force.

  However, as shown in FIGS. 3 and 4b, in the present embodiment, the rib plate 20 is provided in a total of three locations, both the end portion and the central portion of the steel pipe 18, and the deformation of the brace material 16 when the compressive force F is applied. Since the mode is at least a second or higher deformation mode, according to Euler's buckling equation, the proof strength of the brace material 16 against the compressive force is four times or more the proof strength of the brace material 16 in the primary deformation mode.

  As described above, in the embodiment of the present invention, since the clearance between the brace material 16 and the inner wall 22 of the steel pipe 18 is adjusted by the rib plate 20, the construction of the buckling stiffening brace 10 and the clearance management are easy. Become.

  Moreover, since the rib plate 20 is inside the steel pipe 18, the appearance of the buckling stiffening brace 10 is good.

  Furthermore, since the rib plate 20 is provided at a plurality of locations in the axial direction of the brace material 16, the deformation mode of the brace material 16 becomes a secondary or higher deformation mode. Will improve.

  Further, since the rib plate 20 only needs to be fixed to the brace material 16 by welding or the like, the buckling stiffening brace 10 can be easily constructed.

  In addition, this invention is not limited to said embodiment.

  The brace material 16 may be an I-shaped steel, a polygonal cross section, or a curved surface in addition to the H-shaped steel.

  Moreover, the steel pipe 18 may have a round shape or a polygonal cross section in addition to the rectangular cylinder.

  Furthermore, the position where the rib plate 20 is provided is not limited to three locations, and a plurality of three or more locations can be selected. However, it is necessary to examine the deformation mode.

It is a front view which shows the attachment state of the buckling stiffening brace which concerns on embodiment of this invention. (A) It is a fragmentary perspective view of the buckling stiffening brace which concerns on embodiment of this invention. (B) It is an axial sectional view of the buckling stiffening brace concerning the embodiment of the present invention. It is sectional drawing of the direction orthogonal to the axial direction of the buckling stiffening brace which concerns on embodiment of this invention. It is the schematic diagram which showed the deformation | transformation state of the brace which concerns on embodiment of this invention.

Explanation of symbols

10 Buckling stiffening brace (Buckling stiffening brace)
13 Frame (within the frame)
16 Brace material (Brace material)
18 Steel pipe (stiffened cylinder)
20A Rib plate (Adjustment member, Rib plate)
20B Rib plate (Adjustment member, Rib plate)
20C Rib plate (Adjustment member, Rib plate)
20D rib plate (adjustment member, rib plate)

Claims (3)

A brace material arranged diagonally into the construction surface;
A stiffening cylindrical body extrapolated to the brace material;
A plurality of adjusting members which are erected outward from the outer peripheral edge of the brace material and adjust the clearance with the inner wall of the stiffening cylindrical body;
A buckling stiffening brace characterized by comprising:   The buckling stiffening brace according to claim 1, wherein a plurality of the adjustment members are provided in the axial direction of the brace material.   The buckling stiffening brace according to claim 1 or 2, wherein the adjustment member is a rib plate.

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