具有不同焊接孔的梁柱焊接节点非线性分析

Nonlinear analysis of welded beam- to- column connections with different weld access holes

为了研究不同的焊接孔对节点延性的影响,对具有不同焊接孔的梁柱焊接节点进行了循环荷载作用下的非线性分析。通过改变焊接孔的外形和尺寸来获得不同的有限元模型,节点的延性以焊接孔与梁翼缘相接处的几个力学参数来衡量。分析结果表明,采用中国建筑抗震规范推荐的焊接孔在焊接孔根部产生相对较大的累积塑性应变,而美国FEMA推荐的焊接孔在根部具有较高的三轴比,文献资料中的试验数据证明了结论的正确性。

In this paper, nonlinear analysis of welded beam - column connection with different weld access holes under cyclic loading were performed,with the objective of gaining a better understanding of the effect of different weld access holes on inelastic behavior of connections. The different FEMs employed in this research were derived by changing the shape and size of weld access holes. The duc- tility of connection subassemblies with different weld access holes was measured in terms of several mechanical parameters sampled at the root of weld access hole. Results indicate that connections with the weld access holes recommended by ＂Code for seismic design of buildings＂ in China produce rela- tively the maximum accumulated plastic strain while the weld access holes recommended by FEMA have the highest stress triaxiality ratio. The conclusion drawn from this paper is verified by experimen- tal data available in the literature.