XX形空间相贯节点受力性能有限元分析

复杂空间相贯节点广泛应用于大型空间结构中,目前规范尚无正确完善公式计算其承载力.为研究这类复杂空间相贯节点的受力性能和提出合理的构造改进措施,根据某实际工程,选择同时承受较大轴力和弯矩的XX形空间相贯节点进行有限元分析,并提出5种改进措施来改善节点的力学性态.分析结果表明,增加首先“破坏”支管的壁厚不能显著提高极限承载力；支管与主管汇交处设置加劲肋可以改善节点域的应力分布；在靠近节点域的支管内设置加强板可提高节点极限承载力；支管与主管之间交汇处设置贯穿加劲肋可显著减小主管的变形.

The Mechanical Behavior Analysis of XX-joint with FEM

Although spatial crossing tubular(SCT) joints are widely used in the large-span steel structures,formula for the load bearing capacity of the SCT joints are not perfect.According to the design requirements of an actual project,the XX-joints subject to large axial forces along with large moments are analyzed with FEM.Based on the mechanical behavior of SCT joints obtained from the analysis,five improvement measures are put forward.The further verification shows that increasing the joint wall thickness at the branch pipe where failure happens first will slightly enhance the load bearing capacity.Setting a stiffener at the intersection of main pipe and branch pipe will improve the stress distribution in the core area.Setting a stiffening plate on the branch pipe nearby the core area will increase the load bearing capacity obviously.Setting stiffener at the intersection of main pipe and branch pipe will also reduce the deformation of the main pipe.