Bending-resistant ductile truss frame

Abstract

The invention provides a bending-resistant ductile truss frame, and belongs to the field of earthquake proofing of building structures. According to the technical scheme, the bending-resistant ductile truss frame is that a yielding energy dissipating rod is arranged at the span of a bending moment infection point of the truss under the vertical load effect; two ends of the yielding energy dissipating rod are respectively hinged to adjacent lower chord members; the bearing capacity of the yielding energy dissipating rod is less than that of the lower chord members, so that the yielding energy dissipating rod can be yielded earlier than the lower chord members under earthquake; the yielding energy dissipating rod is mounted after the vertical load is loaded. The equivalent damping ratio of the bending-resistant ductile truss frame under fortification and rare occurrence earthquake is obviously increased and more than that of the common truss frame, the shearing force of the base and interlayer displacement are obviously less than those of the common truss frame, and the energy dissipating effect and earthquake absorption effect are obvious; compared with the common truss frame, a frame column of the bending-resistant ductile truss frame is difficultly avoided plastic hinge, so that the strong column and weak beam yielding mechanism is easily achieved, and as a result, the ductility of the structure is improved, and the preset earthquake proofing performance target is achieved.

Description

technical field [0001] The invention relates to the field of anti-seismic building structures, in particular to a ductile truss anti-bending frame. Background technique [0002] Ordinary truss flexural frame, the flexural bearing capacity of truss is much higher than that of columns, the mechanism of strong columns and weak beams cannot be satisfied, the equivalent damping ratio is small, the shear force of the base is large, plastic hinges are prone to appear at the bottom of the columns, and the seismic performance is not very good. [0003] The American Steel Structure Design Association gave a method to improve the ductility of STMF in AISC-341-10: set the yield section in the middle 10% of the truss, so that the plastic deformation is concentrated here to protect other members, and increase the frame Ductility. However, this method involves larger rods and more complicated design, and it is difficult to ensure that all rods achieve the desired effect. Moreover, in the...

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Problems solved by technology

However, this method involves larger rods and more complicated design, and it is difficult to ensure that all rods achieve the desired effect

Moreover, in the yield section of the area suggested by this method, under horizontal earthquake action, it is not easy to enter yield because the axial force is not very large, and under earthquake action, once the yield section yields, it will reduce the ability of the truss to bear the vertical load , it is easy to cause hidden dangers in structural safety

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