翼缘削弱型钢框架梁柱子结构抗倒塌性能数值模拟

Numerical Simulation Study on Progressive Collapse of Beam-column Structures with Reduced Beam Section Welded Connection

为了研究翼缘削弱型钢框架的抗倒塌性能,采用ANSYS/LSDYNA有限元软件对已完成的钢框架梁柱子结构pushdown试验进行有限元(FE)模拟,并将模拟结果与试验结果进行对比验证其准确性。在此基础上,通过改变选取钢框架子结构的去柱位置进行拓展参数研究,分析了五种去柱工况钢框架梁柱子结构倒塌过程中的破坏模态与抗力曲线。有限元分析表明角柱失效工况承载能力是这五种工况中最低的,在相同结构形式,倒数第二边柱与倒数第二内柱发生倒塌的可能性较高。

In order to study the progressive collapse of reduced beam section welded connection steel frame,the finite element( FE) simulation of the completed steel frame beam column structure pushdown test was carried out by ANSYS/LSDYNA finite element software,and the simulative results were compared with the test results to verify its accuracy. On this basis,load-displacement curve and failure mode of five column removal scenarios in the process of steel frame substructure collapse was analyzed through changing the column removal position of steel frame substructure to do extended parameter study. The finite element analysis shows that the load capacity of the corner column failure scenarios is the lowest among the five scenarios. In the same structure,the possibility that the penultimate-internal( PI) and penultimate-external( PE) column removal cases collapse are relatively higher.