单层柱面网壳风致动力失效特征及简化分析

Wind-induced dynamic failure characteristics and simplified analysis of single-layer cylindrical reticulated shell structures

为简化网壳结构在风荷载下的弹塑性动力失效分析过程,提出了基于动力失效的等效静力风荷载的简化计算方法,使网壳结构的抗风设计同时满足强度和稳定性的要求.通过对单层柱面网壳结构进行风荷载下的静力、动力失效全过程分析,给出了综合Budiansky-Roth准则和Hsu S C准则的动力失效判别方法,以准确、有效地确定网壳结构的动力失效临界荷载系数.结合概念分析和定量计算,指出了风荷载下网壳结构的动力失效模式包括弹性动力失稳破坏、弹塑性动力失稳破坏和塑性动力强度破坏.对比网壳结构的静力、动力失效临界荷载系数,确定了基于动力失效的等效静力风荷载系数,可为网壳结构抗风设计提供参考.

In order to simplify the elastoplastic dynamic failure analysis of reticulated shell structures under wind load,a simplified calculation method of equivalent static wind load based on dynamic failure is proposed.The strength and stability requirements can be met during the wind-resistant design of reticulated shells.Using the analysis of the static and dynamic failure of reticulated shells under wind load,the critical load factor of dynamic failure of reticulated shells is accurately determined by the method of dynamic failure judgment based on the combination of Budiansky-Roth criterion and Hsu S C criterion.Combined with concept analysis and quantitative calculation,the dynamic failure modes of reticulated shell structures under wind load are pointed out simply and quickly,including elastic dynamic instability failure,elastoplastic dynamic instability failure and plastic dynamic strength failure.By comparing the static and dynamic failure critical load factor of reticulated shells,the equivalent static wind load based on dynamic failure is determined,which can be used as a reference for wind-resistant design of reticulated shell structures.