碗式半刚性节点网壳弹塑性稳定分析

Elasto-plastic analysis on single layer reticulated domes with socket-joint system

摘要:

碗式节点(Socket-joint)具有一定的抗弯承载力,是一种典型的半刚性节点,也是一种新型的大跨空间结构节点形式.为能够较准确地得出碗式节点的弯矩-转角曲线,使用有限元软件ANSYS对其进行数值模拟,研究了碗式节点的弯曲刚度特征,得到节点的弯矩-转角曲线.在此基础上,研究了40m的K8型半刚性节点的单层球面网壳的弹塑性稳定性能,分析了网壳在矢跨比,节点的弯曲刚度,网壳分频数等参数变化的情况下,网壳极限承载力的变化规律.通过参数分析,较为全面掌握了碗式半刚性节点单层球面网壳的稳定性能.

Abstract:

A socket-joint system with partial bend-bearing capacity is a typical semi-rigid joint system.The numerical model of the joint was established with solid element and contact element using finite element software ANSYS.The mechanical characters of socket joint system were studied in detail and the bending stiffness curves of socket joints were established.Then,Using nonlinear beam element with spring elements in its each end,Kiewitt8 (K8) single-layer reticulated domes with socket joints were analyzed through ANSYS considering several different parameters including bending stiffness,ratio of rise to span,and division number.The influences of the parameters on the critical load of the domes were obtained.