JP2939916B2 - Built-in beam damper for steel girder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damper for a girder made of steel frame.

[0002]

2. Description of the Related Art As shown in FIG. 3, in a conventional vibration damper 1 for a steel beam of a steel structure, a pair of steel beam members 2 and 2 constituting the beam a are of a beam built-in type.
Are arranged so as to abut each other at the center of the girder a, and the steel dampers 4 are attached and fixed to both surfaces of the web 2a of the girder of the steel so as to extend over the ends 3 and 3 of the adjacent girder.

[0005] As shown in FIG. 5, the steel damper 4 has a plate shape made of a substantially H-shaped steel material, and has a mounting surface portion 40 which is bolted to the web 2 a of the steel beam member 2 as described above. And a continuous portion 41 whose center is thinned by connecting the mounting surface portion 40.

[0004]

However, regarding a steel structure employing the above-structured vibration damper, when this steel damper is examined at an early level (elastic design area) of the seismic motion input, the plasticization area is small. ,
Therefore, there is a disadvantage that the energy absorbing ability is low. Further, since the substantially H-shaped steel damper is cut out from the steel plate, the material cost is high.

In view of the above circumstances, it is an object of the present invention to increase the plasticization area of a vibration damper at an early level of a seismic motion input, and to reduce the energy absorption capacity of the vibration damper at a low cost. The purpose is to increase.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a pair of steel girder members constituting a girder are arranged so as to abut each other at the center of the girder. A steel damper provided with a steel damper over the adjacent end of the steel beam damper, the steel damper comprises a longitudinally extending C-shaped channel member and a C-shaped channel member.
A tongue-shaped member provided at the upper and lower ends of a mold channel member, wherein the C-shaped channel member of the steel damper is fixedly attached to each web of the steel beam girder member, and the tongue-shaped member of the steel damper is An object of the present invention is to provide a beam-embedded damper for a steel girder, wherein the damper is mounted and fixed to a tongue-like member provided from the flange of each steel girder member to the web. It is.

[0007]

In the present invention, the tongue member of the steel damper and the tongue-like member on the side of the steel beam connected to the steel damper receive the energy through the steel damper composed of the C-shaped channel at the early level of the seismic motion input. As a result, plastic deformation is likely to occur, so that the energy absorption capacity of the vibration damper is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on one embodiment shown in FIGS. In the present invention, as shown in the drawing, the damping portion 1 is of a beam-incorporated type. First, the steel damper 5 is composed of a C-shaped channel member 6 and a C-shaped channel member 6 extending in the longitudinal direction of the girder a. 6, a plurality of tongue-shaped members 7 standing upright on the upper and lower flanges 60 (the tongue-shaped members 7 are erected so that their surfaces face the longitudinal direction of the girder a). An upright member 61 is integrally provided between the upper and lower flanges 60 of the C-shaped channel member 6 so as to connect the upright portions of the shaped members 7.

The C-shaped channel member 6 of the steel damper 5 is attached and fixed by bolting so as to extend over the ends 3, 3 of the steel beam members 2, 2 and sandwich the web 2a from both sides. ing. On the ends 3 and 3, the tongue-like members 8 extend from the upper and lower flanges 2b of the steel beam members 2 and 2 to the web 2a.
Are provided integrally at positions corresponding to the tongue-shaped members 7 (the tongue-shaped members 8 are perpendicular to the flange 2b and the web 2a), and each of the tongue-shaped members 8 The vibration control damper part 1 is constituted by connecting and fixing the shaped member 7 by bolting.

In the vibration damper 1 having the above structure,
The energy transmitted through the C-shaped channel material 6 at an early level of the seismic motion input makes it easier for the tongue-shaped member 7 and the tongue-shaped member 8 to reach a shape deformation in which plastic deformation occurs, and the energy absorbing ability is enhanced. I have.

[0011]

As described above, according to the present invention,
A pair of steel girder members constituting the girder are arranged so as to abut each other at the center of the girder, and the steel girder is provided in a vibration damper portion of a steel girder provided with a steel damper over an adjacent end of the girder member. The damper includes a C-shaped channel member extending in the longitudinal direction and tongue-shaped members provided at upper and lower ends of the C-shaped channel member. The C-shaped channel member of the steel damper is attached to each of the webs of the steel beam girder member. Since the tongue-shaped member of the steel damper is fixedly attached to the tongue-shaped member provided from the flange of each steel girder member to the web, the steel damper is provided on the steel damper at an early level of seismic motion input. It is expected that steel materials such as tongue-shaped members and tongue-shaped members provided on the steel girder member side will yield, so that a damper part with high energy absorption capacity can be obtained. It made. In addition, material costs are significantly lower than those using conventional plate-shaped steel dampers, and beam-integrated vibration dampers can be obtained at low cost. Things.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a beam-embedded type vibration damper in a steel girder according to the present invention.

FIG. 2 is an explanatory diagram showing a cross section taken along line AA of FIG. 1;

FIG. 3 is an explanatory diagram showing a conventional example.

FIG. 4 is an explanatory diagram showing a cross section taken along line BB of FIG. 3;

FIG. 5 is an explanatory view showing a steel damper in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Damping damper part 2 ... Steel girder member 2a ... Web 2b ... Flange a ... Girder 3 ... End of steel girder member 5 ... Steel damper 6 ... C-shaped channel member 7 ... Tongue-shaped member 8 ... Tongue-shaped member

Claims (1)

(57) [Claims] 1. A seismic damper for a steel girder, wherein a pair of steel girder members constituting a girder are arranged so as to abut each other at the center of the girder, and a steel damper is provided over an adjacent end of the steel girder member. Wherein the steel damper comprises a C-shaped channel member extending in the longitudinal direction and tongue-shaped members provided at upper and lower ends of the C-shaped channel member, wherein the C-shaped channel member of the steel damper is formed of the steel beam. A tongue-shaped member of the steel damper, the tongue-shaped member of the steel damper being attached and fixed to a tongue-shaped member provided from the flange of each steel frame girder member to the web; Built-in vibration damper.