节点刚度对方管空间三角形桁架动力性能的影响

Influence of Joint Stiffness on Dynamic Behavior of Spatial Triangular SHS Truss

为研究节点刚度对方管空间三角形桁架动力性能的影响,以精细壳元模型为标准,采用可考虑节点轴向刚度的简化模型和不能考虑节点轴向刚度的刚接模型,对方管空间三角形桁架进行了模态分析和地震时程分析。结果表明:节点刚度对方管桁架的动力性能有不可忽视的影响,不宜采用刚接模型分析方管桁架的动力反应;本文中采用的简化模型可以较好地模拟方管桁架的动力性能,体现了节点刚度对结构动力性能的影响,更适用于实际工程分析。

In order to study the influence of joint stiffness on dynamic behavior of spatial triangular square hollow section（SHS） truss,the modal analysis and seismic time history analysis of the spatial triangular SHS truss were done using three models： the fine shell element model which was regarded as standard,the simplified model considering the joint axial stiffness and the rigid connected model without considering the joint axial stiffness.The results show that the influence of joint stiffness on the dynamic behavior of square tube truss cannot be negligible and the rigid connected model is not suitable for the dynamic response analysis of square tube trusses,but the simplified model can simulate the dynamic behavior of square tube truss more accurately and reflect the effect of joint stiffness better.The simplified model in the paper is more suitable for the practical engineering analysis.