模块化装配式钢结构梁柱节点极限承载力分析与抗震性能研究

ANALYSIS OF THE LIMIT BEARING CAPACITY AND SEISMIC PERFORMANCE OF TYPICAL JOINT OF TRUSS-BEAM AND COLUMN IN FABRICATED HIGH-RISE STEEL STRUCTURE

利用ABAQUS大型有限元结构分析软件对模块化装配式高层钢结构中3种常见的焊接、栓接、栓焊混合连接节点进行非线性分析,得到3种节点的破坏机理、极限承载力以及单调循环荷载下的耗能能力。结果表明:焊接节点极限承载力最高,但塑性变形主要集中在节点域,没有实现"强节点弱构件";栓接节点在单调循环荷载作用下接触面容易滑移;栓焊混合节点中两片梁段的刚度不同会导致整个桁架梁段的平面外失稳,进而影响节点的极限承载力,并对3种典型装配式钢结构节点的设计提出一些建议。

Welded joints,bolted joints,bolted and welded joints are the typical joints in fabricated high-rise steel structure.The paper established three models of the joints of truss-beam and column for nonlinear analysis using the finite element software ABAQUS , it was got that the failure mechanism , the limit bearing capacity and the energy dissipation capacity that was the one in the function of monotonic cyclic load .The results show that the limit bearing capacity of the welded joint is the highest ,but the plastic deformation mainly appears in joint region ,so it dissatisfies the seismic request .The slip occurs easily in frictional regions for the bolted joint in the function of monotonic cyclic load.The out-of-plane buckling of the overall truss-beam in bolted and welded joint occurs due to the different stiffness of the two sections of the single beam-truss.So the limit bearing capacity of this joint is the lowest .It was proposed that some suggestions on the design of three typical joints of truss -beam and column in fabricated high-rise steel structure .