【摘要】 节点刚度与单层网壳结构的刚度与稳定性关系密切。采用了可以真实模拟相贯节点单层柱面网壳的多尺度计算模型,在节点域内采用精度较高的壳单元,在节点域外采用梁单元,节点域与杆端在连接面形心处位移与转角保持连续。该计算模型可以较为准确地反映相贯节点的力学性能,计算精度高、单元数量少,可同时进行结构整体与节点局部的计算分析。运用该模型全面考察了相贯节点刚度对单层柱面网壳跨中挠度、动力特性与屈曲性能的影响。通过对相贯节点进行补强,能够有效增强节点的刚度,采用梁单元模型即可进行单层网壳结构的计算分析,结构设计简便、结构效能较高。更多还原

【Abstract】 The stiffness of tubular joint has a significant impact on the rigidity and stability of single-layer latticed shell.This paper presents a multi-scale model for the tubular joints in a single-layer latticed cylindrical shell.High quality shell elements are applied in the connection zone,and beam elements are applied to simulate the pipes far from the connection.The displacement and rotation angle of the connection and beam ends remain continuous at the centroid of joint interface.This analytical model can predict mechanical behavior of tubular joint with good accuracy and the amount of elements is small.Also it is capable of analyzing both detailed joint and the entire structure.By utilizing this model,the effect of tubular joint stiffness on single-layer latticed cylindrical shell is studied,including its mid-span deflection,dynamic characteristics and buckling behavior.The results show the joint stiffness can be significantly enhanced by applying joint strengthening measures.In conclusion,the analytical model presented herein can be applied to evaluate the behavior of single-layer latticed cylindrical shell.The simplicity and accuracy make it attractive in both design and analysis situations.更多还原