JPH0833023B2 - RC steel structure seismic resistant structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a steel frame seismic element that improves seismic performance of an opening of a reinforced concrete frame, and a steel frame structure of a reinforced concrete structure having the seismic element in the opening. Regarding earthquake-resistant structure.

<Conventional technology> When constructing a building frame with reinforced concrete, the cross-sectional area of columns and beams was increased in order to improve seismic performance.

 Seismic walls were also installed.

<< Problems to be solved by the invention >> If the cross-sectional area of columns or beams is increased, the living space becomes narrower,
Weight also increases. In addition, since the seismic wall does not have high toughness, the weight increases due to the need to increase the strength, and the usability of the building is not good.

The present invention has been made in view of the above circumstances, and an object thereof is to eliminate the above-mentioned conventional drawbacks. That is,
It is to improve the seismic performance of reinforced concrete frames without using seismic walls while minimizing their cross-section.

<< Means for Solving the Problem >> In order to achieve the above object, the steel structure seismic resistant structure of RC according to the present invention has a square shape that abuts and engages with the inner peripheral surface of the square shape opening of a steel concrete structure. A steel frame member and a steel brace obliquely extended and connected from both ends of any one side of the rectangular steel frame member to a tip of a shear panel projecting at approximately the center of the other side at the opposite bank position The shear panel is provided with a steel-based seismic resistant element that is set so as to yield before the steel brace.

<< Working >> According to the RC-structured seismic structure of the present invention having the above configuration, when an earthquake occurs, the shear panel yields before the steel brace yields. The energy of the earthquake is absorbed by the deformation at the time.
As a result, a damper function, that is, a vibration damping effect can be achieved.

In addition, by yielding the shear panel before the steel brace, damage to the structure due to the earthquake can be concentrated on the shear panel. As a result, the repair work of the structure after the occurrence of the earthquake only requires the replacement of the shear panel, and the work becomes easy.

«Examples» Hereinafter, preferred examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a case in which a steel frame seismic resistant structure 4 of the present invention is applied to a rectangular opening 3 surrounded by a reinforced concrete column 1 and a beam 2.

An H-shaped steel is arranged along the inner peripheral surface of the opening 3 to form a frame member 5 which is a quadrangular steel frame member. Then, the central web of the upper horizontal frame located on the upper side of the frame member 5 and both end partial webs of the lower horizontal frame located on the lower side are reinforced by the stiffeners 6.

Further, the shear panel 7 is hung and fixed to the central portion of the upper horizontal frame of the frame member 5, and the steel braces 8 that are erected obliquely upward from both ends of the lower horizontal frame are connected and fixed to the vertical lower ends of the shear panel 7. There is. That is, the steel braces 8 are not directly connected to each other in the frame member 5 in the shape of “C”, but the steel braces 8 and the shear panel 7 constitute an inverted Y-shaped steel frame seismic resistant element in the frame member 5.

The steel-frame-based seismic resistant structure 4 having the above configuration is lighter than a steel-framed concrete earthquake-resistant wall because it is made of steel frame, and is advantageous in that the weight of the building is not increased. Further, by contacting and joining the frame member 5 to the inner peripheral surface of the opening 3 and pressing the inner peripheral surface with the frame member 5, the stress acting on the inner peripheral surface can be dispersed and transmitted to the frame member 5.

The shear panel 7 includes the frame member 5 and the steel brace 8
And absorbs energy transmitted between them, and in cooperation with the frame member 5, resists tensile axial force, compression axial force, moment and shearing force generated around the shear panel 7. can do.

Further, the shear panel 7 can enhance the seismic performance of the reinforced concrete portion in the opening 3. That is, since the shear panel 7 can secure appropriate strength and large toughness, it absorbs a large amount of energy in the event of an earthquake, reduces response deformation of the building and reduces damage, and also has a function as a damper, that is, a vibration damping effect. You can have it. As a result, damage to the reinforced concrete portion can be reduced.

In addition, the strength and rigidity of the steel brace 8 is increased by the shear panel 7.
Rather than being sufficiently high, damage can be concentrated on the shear panel 7 when an excessive seismic force is applied. Therefore, it is possible to avoid repairing the RC structure by advancing the damage to the steel frame element. That is, at the time of repair, replacement of the shear panel 7 is sufficient, and the work is facilitated.

It should be noted that only when a large earthquake is predicted, a steel frame seismic element (steel frame seismic structure) can be attached to the RC building opening, and it can also be used as an open space, so the usability of the building is good.

Further, the present invention can be incorporated as a seismic element in a steel reinforced concrete building as well. Further, it can also be applied to civil engineering structures such as railway bridges and road bridges.

<Effect> As described in detail above, according to the RC-type steel frame seismic resistant structure of the present invention, when an earthquake occurs, the shear panel is yielded before the steel brace, so that the shear panel is The seismic energy is absorbed by the deformation when yielding. As a result, a damper function, that is, a vibration damping effect can be achieved.

In addition, by yielding the shear panel before the steel brace, damage to the structure due to the earthquake can be concentrated on the shear panel. As a result, the repair work of the structure after the earthquake occurs only by exchanging the shear panel, and the work becomes easy.

[Brief description of drawings]

FIG. 1 is a front view exemplifying an RC steel frame seismic resistant structure according to the present invention. 1 ... Column, 2 ... Beam 3 ... Opening, 4 ... Steel frame seismic structure 5 ... Frame member, 6 ... Stiffener 7 ... Shear panel, 8 ... Steel brace

Claims (1)

[Claims] 1. A quadrangular steel frame member that abuts and engages with an inner peripheral surface of the quadrangular opening of a steel concrete structure, and the other side located at the opposite bank position from both ends of any one side of the quadrangular steel frame member. And a steel frame brace obliquely extended and connected to the tip of a shear panel projecting in the substantially central part of the steel frame seismic element, wherein the shear panel is set so as to yield before the steel brace. RC-structured steel frame seismic structure characterized by including.