梁柱焊接接头在模拟地震循环载荷作用下的有限元分析

FEM Analysis of Beam-to-Column Welded Connection Under the Simulating Earthquake Cyclic Load

为了研究建筑钢结构梁柱焊接接头在地震作用下的弹塑性响应 ,提高焊接接头的抗震性能 ,采用大型有限元软件ANSYS对建筑钢结构中比较常见的H形梁柱焊接接头和“狗骨式”焊接接头在模拟地震循环载荷作用下进行了弹塑性有限元分析 ,得到了梁端加载点的载荷 -位移滞回曲线和节点焊接接头的等效应力分布。引入耗能系数作为焊接节点耗散地震能量的衡量指标 ,计算了不同形式的焊接节点在循环载荷作用下的耗能系数。分析结果表明 ,狗骨式焊接节点的抗震性能优于普通节点。

In order to study the plastic response of the beam-to-column welded connection under the seismic load and improve the earthquake-resistant performance of welded joint, the non-linear FEM analysis of H and Dog Bone Type of welded connection under the simulating seismic cyclic load was carried out by utilizing the ANSYS programming package. The von-Mises equivalent stress of welded joint and the hysteresis loops were obtained. The dissipative coefficient was introduced and used as an index to evaluate the dissipative capacity of the welded connection under the seismic load. The dissipative coefficient of two types of welded connection was computed and the results indicated that the earthquake resistant performance of the Dong Bone connection was better than that of the typical welded connection.