圆支管-H型钢主管T型节点轴压承载力的有限元分析

摘要

以圆支管-H型钢主管T型受压节点的试验数据为基础,运用有限元软件Abaqus对节点进行建模和计算,从节点极限承载力、变形过程和破坏模式等方面对节点的非线性有限元建模方法进行了校验.研究结果表明:节点在轴向压力作用下,支管根部发生象足式屈曲与局部屈曲,同时主管鼓曲；相对主管,支管壁厚较小,工程中应避免或采取加强措施；节点从开始屈服到最后破坏,具有较强的塑性变形能力.%A finite element model on CHS brace-H-section steel chord T-joints was generated by Abaqus and validated by comparing the ultimate capacity, deformation process and failure mode with experimental results. The result showed that under the effect of axial pressure, elephant-foot buckling and local buckling occur at the root of brace, and flange buckling occurs at chord; in engineering it should be avoided that the thickness of brace is relatively smaller than chord, or joints should be strengthened; CHS brace-H-sec-tion steel chord T-joints has strong plastic deformation capacity from being yield.