JP2009019425A - Brace damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brace damper that can increase a resistance and a rigidity only by connecting an inexpensive article on the market by bolts as it is. <P>SOLUTION: The brace damper has a brace core material 30 consisting of a tie plate-shaped steel plate with a yielding section yielding by a specified axial tension and channel-shaped steel 10A to 10D paired in the left and the right as restraining members preventing the buckling of the brace core material 30 while permitting the axial deformation of the brace core material 30 by fitting the channel-shaped steel on both left and right sides of the brace core material 30 in a form holding the brace core material 30 by web sections 11 from both sides. The brace damper further has a pair of cover plates 20 mutually connecting flange sections for the channel-shaped steel 10A to 10D while crossing the brace core material 30. In such a brace damper, two pairs of the channel-shaped steel 10A to 10D are arranged in the vertical direction and fitted, and the flange sections 12 for the vertically adjacent channel-shaped steel 10A to 10D are connected mutually by the bolts 50 while the flange sections 12 for the left and right channel-shaped steel 10A to 10D on the outermost sides are connected mutually by the cover plates 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a brace damper that is installed as a brace in a building and also functions as a damper that absorbs vibration energy of the building.

  As a method for reducing the responsiveness of a building to earthquakes or strong winds, a method of installing a damper at a key point of the building is generally well known. In recent years, earthquake damage to buildings is often caused by brace buckling, so the use of brace dampers has been widely studied as a countermeasure.

  Brace dampers that resist axial force are the most popular because they have a simple mechanism and are easy to handle in design, and examples thereof are disclosed in Patent Document 1 and Patent Document 2.

FIG. 2 shows an example of a conventional brace damper, where (a) is a longitudinal sectional view and (b) is a transverse sectional view.
The brace damper includes a brace core member 130 made of a strip-shaped steel plate having a yield portion (range indicated by L2) that yields by a predetermined axial force, and the brace core member 130 sandwiched between the web portions 111 from both sides. A pair of grooved steel (channel material) 110 as a restraining member that prevents buckling while allowing axial deformation of the brace core member 130 by being mounted on both sides of the brace core member 130, and the groove shape A pair of cover plates 120 that connect the flange portions 112 of the steel 110 with high-strength bolts 150 across the brace core material 130 are provided. The brace core material 130 has a length L1 that is larger than the length L3 of the channel steel 110.

Moreover, in order to reinforce the rigidity of the channel steel 110 which is a restraining member, there is also one in which a transverse rib extending along the material axis direction of the brace core material 130 is welded to each web portion 111.
JP 2002-235380 A JP 2005-307595 A

By the way, in the conventional brace damper mentioned above, since a pair of channel steel 110 and the cover plate 120 are only used as a restraining member, there is a tendency that the strength is insufficient for applications requiring high proof stress and high rigidity. It was. Therefore, welding of the lateral rib to the web portion 111 of the channel steel 110 is also performed. However, when the lateral rib is welded and attached, there is a problem in that the cost increases because the number of processing steps increases.
Although it is conceivable to increase the plate width of the brace core material 130, the web height of commercially available grooved steel is 400 mm, so it is necessary to process the steel plate to produce a restraining member, which is realistic. is not.

  In consideration of the above circumstances, an object of the present invention is to provide a brace damper that can achieve high strength and high rigidity by simply connecting a commercially available product at a low price with a bolt as it is.

  The invention according to claim 1 is a brace core made of a strip-shaped steel plate having a yielding portion that yields by a predetermined axial force, and the brace core is sandwiched between the web portions from both sides on both left and right sides of the brace core. By mounting, the brace core material that forms a pair of left and right grooves as a restraining member that allows the brace core material to be deformed in the axial direction and prevents buckling thereof, and the flange portions of the groove steel material are connected to each other. In a brace damper including a pair of cover plates that are connected across a plurality of pairs, the grooved steels are arranged in a vertical direction and a plurality of pairs are provided, and the flanges of the grooved steels adjacent to each other in the vertical direction are connected with bolts, and the outermost side The flange portions of the left and right channel steels are connected by the cover plate.

  Invention of Claim 2 is the brace damper of Claim 1, Comprising: The said brace core material consists of a very mild steel or a mild steel, and makes the material axial direction intermediate part of the said brace core material a cross section smaller than both ends. Thus, the yield portion is formed.

  The invention of claim 3 is the brace damper according to claim 1 or 2, wherein the longitudinal ribs are welded between the upper and lower flanges of each channel steel at intervals in the longitudinal direction of the channel steel. It is characterized by providing.

  According to the invention of claim 1, the flange portions of the grooved steel adjacent to each other in the vertical direction are connected by bolts, so that the flange portions connected by the bolts serve as horizontal ribs extending along the longitudinal direction. Fulfill. Therefore, it is possible to increase the yield strength and rigidity of the restraining member while adopting an inexpensive configuration in which commercially available channel steel is connected with bolts. Moreover, since the cross-sectional size of the brace core material to be inserted can be increased by using a plurality of pairs of channel steels, it is possible to increase the strength and rigidity.

  According to the invention of claim 2, by using a material having a lower yield strength than the steel material constituting the structure, such as extremely mild steel (very low yield point steel) or mild steel, high plasticity can be obtained. A brace damper having energy absorption capability can be realized. Moreover, since a yield portion having a smaller cross section than both ends is formed in the intermediate portion in the axial direction of the brace core material, a large strain is generated in the yield portion compared to other portions, and it is easy. Can yield at the surrender.

  According to invention of Claim 3, since the vertical rib was put in the appropriate location, the torsional rigidity and bending rigidity of channel steel can be improved.

Hereinafter, embodiments of a brace damper according to the present invention will be described with reference to the drawings.
1A and 1B are diagrams showing a configuration of an embodiment of a brace damper according to the present invention, in which FIG. 1A is a side view showing a partial configuration, and FIG. 1B is a cross-sectional view taken along line Ib-Ib in FIG.

  The brace damper according to the present embodiment includes a brace core 30 made of a strip-shaped steel plate having a yielding portion that yields by a predetermined axial force, and a brace core 30 sandwiched between the web portions 11 from both sides. A pair of left and right channel steels 10A to 10D as restraining members that allow the brace core 30 to be deformed in the axial direction while being attached to the left and right sides, and these channel steels 10A to 10D. And a pair of cover plates 20 that connect the flange portions 12 across the brace core 30.

  The two pairs of channel steels 10A to 10D are arranged side by side in the vertical direction (longitudinal direction), and the flange portions 12 of the channel steels 10A to 10D adjacent to each other in the vertical direction are connected by a high-strength bolt 50. Further, the flange portions 12 of the outermost left and right channel steels 10 </ b> A to 10 </ b> D are connected by a high-strength bolt 50 through the cover plate 20.

  The brace core material 30 is made of ultra-soft steel (extremely low yield point steel) or mild steel having a high plastic energy absorption capacity. The intermediate portion in the longitudinal direction of the brace core 30 is narrower than both end portions, and the portion is a yielding portion having a small cross-sectional area (same as the conventional product). When a predetermined axial force is applied to the brace core member 30, a large strain is generated in the yield portion as compared with the end portion, and the yield portion easily yields.

  On the other hand, the ends of the brace core 30 are also ends of the brace damper itself, and the both ends are fixed to the structure with high-strength bolts, so that the brace damper is installed as a brace on the frame. Although not shown in the drawings, for example, a rib plate is welded along the material axis of the brace core material on both sides of the end portion of the brace core material 30 so that both end portions of the brace damper are formed in a cross-section.

  Between the surface of the brace core 30 and the web portions 11 of the channel steels 10A to 10D, a cushioning material having a thickness of about 1 mm (not shown) is interposed so that they can be held in an unbonded state. As the buffer material, a sheet material made of a polymer material such as chloroprene rubber that does not inhibit the relative deformation between the brace core material 30 and the channel steels 10A to 10D and does not generate sound is suitable.

In addition, the required number of vertical ribs 40 are provided at appropriate portions of the groove steels 10A to 10D by welding between the upper and lower flanges 12 of each of the groove steels 10A to 10D at intervals in the longitudinal direction. ing.
In addition, the thing which has the height for two steps of the channel steel is used as the vertical rib 40, and both the flanges of the channel steels 10A to 10B adjacent to the upper and lower sides or the channel steels 10C to 10D are overlapped. It is also possible to cut out the portion 12 with a predetermined width and insert the vertical rib 40 there.

  In the brace damper of this embodiment, the flange portions 12 of the groove steels 10A to 10D adjacent to each other in the vertical direction are connected to each other by the bolt 50, so that the central flange portion 11 connected by the bolt 50 is in the longitudinal direction. It will act as a lateral rib extending along. Therefore, while adopting an inexpensive configuration in which commercially available channel steels 10A to 10D are connected with bolts 50, the restraint members (the channel steels 10A to 10D and the cover plate 20) have higher yield strength and higher rigidity. Can do. Further, by using two pairs of left and right channel steels 10A to 10D, it is possible to increase the cross-sectional size of the brace core material 30 to be inserted therein, so that high yield strength and high rigidity can be achieved.

In addition, since a material having a lower yield strength than the steel material constituting the structure, such as extremely mild steel (very low yield point steel) or mild steel, is used for the brace core material 30, it has a high plastic energy absorption capability. A brace damper can be realized. Moreover, since the yield portion having a smaller cross section than the both end portions is formed in the intermediate portion in the material axis direction of the brace core material 30, it is possible to generate a large strain in the yield portion compared to other portions, It is possible to yield at the yielding part easily.
In addition, the intermediate part of the brace core material 30 in the material axis direction can have the same width as both end parts, and can be used as a normal earthquake-resistant damper.

  In addition, by inserting the longitudinal ribs 40 at appropriate positions in the longitudinal direction of the grooved steels 10A to 10D, the torsional rigidity and bending rigidity of the grooved steels 10A to 10D can be increased, and the rigidity of the brace damper can be further increased. Can be planned.

  In addition, in the said embodiment, although the case where groove-shaped steel 10A-10D was piled up on two steps up and down was shown, it can also pile up on three steps or more.

It is a figure which shows the structure of the brace damper of embodiment of this invention, (a) is a side view which shows a partial structure, (b) is Ib-Ib arrow sectional drawing of (a). It is a figure which shows the structure of the conventional brace damper, (a) is a sectional side view, (b) is a principal part cross-sectional view.

Explanation of symbols

10A, 10B, 10C, 10D Channel steel 11 Web part 12 Flange part 40 Vertical rib 50 High strength bolt

Claims (3)

By attaching the brace core material made of a strip-shaped steel plate having a yield portion yielded by a predetermined axial force, and the brace core material on both the left and right sides of the brace core material in a form sandwiched between the web portions from both sides, A pair of groove steels that form a pair of left and right as restraining members that allow axial deformation of the brace core material and prevent buckling thereof, and a pair of flange portions of the groove steel members that straddle the brace core material In a brace damper comprising a cover plate,
A plurality of pairs of groove steels are arranged in the vertical direction, and the flange parts of the groove steels adjacent to each other in the vertical direction are connected with bolts, and the flange parts of the outermost left and right groove steels are connected with the cover plate. A brace damper characterized by that. The brace damper according to claim 1,
The brace damper is characterized in that the brace core material is made of extremely mild steel or mild steel, and the yield portion is formed by making the material axial direction intermediate portion of the brace core material a cross section smaller than both end portions. The brace damper according to claim 1 or 2,
A brace damper characterized in that vertical ribs are provided by welding between the upper and lower flanges of each channel steel at intervals in the longitudinal direction of the channel steel.

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