Dog-bone joint beam end buckling constraining device

Abstract

The invention provides a dog-bone joint beam end buckling constraining device. The device comprises constraining cover plates (1), constraining U-steel (2), filling plates (3) arranged between the constraining cover plates and the constraining U-steel, and connecting bolts (4), wherein the constraining cover plates (1) are arranged on the outer sides of upper and lower flange weakening parts (7-1) at the ends of a steel beam (7) provided with a dog-bone joint; the constraining U-steel (2) is arranged on the portions, corresponding to the two sides of a web, of the flange weakening parts; and the connecting bolts (4) are used for connecting the constraining cover plates, the constraining U-steel and the filling plates to form the complete constraining device. When an earthquake occurs, the beam end flange weakening parts yield in advance of other parts and components, earthquake energy is dissipated through the hysteretic characteristic, and by adoption of the constraining device, press on the beam end flange weakening parts and large-amplitude buckling possibly occurring outside the plane of a steel plate when the corresponding web is pressed and sheared can be limited, shortening of the fatigue lives of the flange weakening parts and degradation of joint rigidity and strength are prevented, the steel beam (7) in a joint area is protected against complete buckling outside the plane, the fullness of a hysteretic curve is ensured, and the joint deformation capacity and ductility and the lateral stability of the beam are improved.

Description

technical field [0001] The invention belongs to the field of construction engineering and relates to a steel frame structure, in particular to a buckling restraint device applied to the end of a dog-bone joint beam of a steel frame structure. Background technique [0002] my country is an earthquake-prone area. With the widespread application of steel structures in building structures, it is particularly important to study their seismic performance and propose reasonable seismic design countermeasures. After the 1994 Northridge earthquake in the United States and the 1995 Hanshin earthquake in Japan, people paid more and more attention to the structural form and seismic performance of steel structure joints. On the basis of research and analysis of traditional beam-column joints, many improved new Node forms can be mainly divided into two categories: strengthened and weakened. The dog-bone joint that appeared in recent years belongs to a new type of weakened joint form. The...

AI Technical Summary

Problems solved by technology

The out-of-plane buckling instability of the steel plate that may be produced by the flange and the web may affect the performance of the energy dissipation capacity of the node at the slightest level, reduce the low-cycle fatigue life of the weakened part of the flange, and lead to premature failure of the joint at the worst

Some tests have also shown that the out-of-plane stiffness of the steel beam is reduced because the dog-bone joint weakens the flange section in the joint area, and the overall out-of-plane buckling of the steel beam is prone to occur.

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