| The facts that Brittle fracture occurred in the weld of beam—column welded connection in steel structure in the earthquake of Northrige in America in 1994 and Kobe in Japan in 1995 showed that welding residual stress is one of the important factor which lead to this kind of brittle fracture.Therefore it is very important to study the effect of residual stress to the performance of resistance to earthquake of beam-column connection to ensure the safety of resistance to earthquake of the steel structure.This paper is mainly concentrated on the study the effect of residual stress to the performance of assistance to earthquake of beam-column connection, and covers the following two aspects concerning the main work and research in the project.1) A beam-column welded connection finite element(FEM) of welding field and stress-stain is founded and the material non-liner is considered utilize large-scale finite element analysis software ANSYS,simulate reality beam-column weld node residual stress of the steel structure .2) Research the earthquake-resistant behavior analyses at considering and neglecting the influence of welding residual stress of beam-column welded connection .The results of study showed that to the beam-column welded connection, the existence of the Residual stress under the monotonous load of no significant impact. On the role of repeated load circumstances, the nodes ductility lower, stiffness and strength of lower seismic performance has also deteriorated.
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