单层球面网壳结构动力强度破坏的双控准则

针对在地震等强动力荷载作用下单层球面网壳结构的动力强度破坏问题，通过探讨结构的耗能机理，将结构塑性累积耗能与最大变形进行线性组合建立了动力强度破坏的双控准则，并应用动力破坏指数判定结构的动力破坏程度.以一个跨度为40 m的K8,6型单层球面网壳结构为例，应用动力破坏指数进行了强震下的结构动力强度破坏分析，并同结构最大变形和塑性杆件比例等指标进行了对比.结果表明，应用双控准则和动力破坏指数可以有效地进行单层球面网壳结构动力强度破坏的量化分析，并且对于存在局部刚度薄弱的网壳结构结果更加合理.

Double-control criterion of dynamical strength failure for single layer latticed shells

Aiming at the problem of dynamical strength failure of single layer latticed shells under strong dynamical load such as seismic,based on the dissipated energy mechanism of single layer latticed shells,a double-control criterion of dynamical strength failure was constructed by linear combination of maximum displacement and plastic accumulative dissipated energy.The different extent of dynamical strength failure for latticed shells could be judged by the dynamical failure index.Taking a K8,6 single layer latticed shell of 40 m span as example,the structural dynamical strength failure analysis under strong seismic was carried out applying the dynamical failure index,and the data were compared with those of the structural maximum displacement and the proportion of plastic elements. The results show that the double-control criterion and the dynamical failure index are effective for quantificational analysis of the dynamical strength failure of single layer latticed shells,and are more reasonable for the latticed shell with local weakening stiffness.