强震作用下球面网壳动力强度破坏研究

Dynamic strength fracture of reticular shells under severe earthquakes

为全面认识壳结构塑性发展全过程,以单层K8型球面网壳结构为例,采用ANSYS程序专有的Pipe20单元,对网壳结构的塑性内力重分布、网壳杆件进入塑性比率、杆件截面进入塑性程度、构件塑性变形、结构塑性位移、结构关键节点位移等随地震加速度幅值的全过程响应进行了全面分析.获得了对球面网壳结构有关塑性发展和动力强度破坏行为的认识,较完整地建立了网壳结构高烈度强震分析的实用方法.

With the unique Pipe20-type element of the software ANSYS, the complete dynamic response of the plastic inner force redistribution, plastic element ratio of reticular domes, expansion of plastic zone in element section, plastic deformation of elements, plastic displacement of reticular domes, and displacement of the key joint on reticulated domes in pace with seismic input acceleration are investigated. The practical analysis method - the dynamic strength fracture method of reticular shells under severe earthquakes is established.