单层网壳结构在地震作用下的弹塑性动力响应研究

采用U L有限元列式 ,基于各向同性强化模式 ,Von Mises屈服准则和Prandtl Renss增量理论 ,针对强烈地震作用 ,考虑结构的几何和材料非线性 ,研究单层网壳在多维地震作用下的弹塑性动力响应计算。提出了一种有效的适用于网壳结构非线性动力响应的增量 /迭代有限元计算方法 ,考虑了转角大位移的精确计算 ,并对一个短程线形单层球面网壳结构进行了地震响应的双重非线性时程分析研究 ,探讨了结构的延性抗震性能

ELASTOPLASTIC DYNAMIC ANALYSIS OF SINGLE-LAYER RETICULATED SHELLS UNDER EARTHQUAKE EXCITATION

An incremental iterative nonlinear finite element technique is developed to analyze the elastoplastic dynamic response of single layer reticulated shells under strong earthquake excitation This procedure considers both geometric and material nonlinearities,in which large displacements are incorporated within an updated Lagrangian formulation,and the isotropic hardening model,the Von Mises yield criterion and the Prandtl Renss flow relations are applied to material nonlinearities Moreover,an accuracy method is used to compute the large rotations of space structures A double non linear time path analysis of seismic response is conducted for a structure of short range linear single layer spherical shell,and the seismic behaviour of the structure's ductility is also discussed