单层柱面网壳结构强震作用下抗震性能研究

地震是严重危害人类生命财产的自然灾害 ,但目前工程界对于网壳结构强震下的抗震性能尚缺乏透彻了解。笔者通过对单层柱面网壳典型算例进行三维地震作用下的双重非线性时程分析 ;观察其多项特征响应指标随地震动逐渐增强的变化情况 ;研究其塑性发展过程和破坏特征 ;对单层柱壳强震作用下的破坏机理进行了探讨 ;并在此基础上对不同参数柱壳弹塑性地震响应规律和破坏特征进行了分析和总结。研究表明 ,地震作用下单层柱壳破坏前均经历了一定的塑性发展过程 ,其破坏的真正原因是结构塑性发展和位形变化的交互作用 ,矢宽比较大的柱壳倾向于动力失稳破坏。

Study on Anti-seismic Performance of Single-layer Latticed Cylindrical Shell under Severe Earthquake

Nowadays anti-seismic performance of space frames under severe earthquake is not yet fully understood although earthquake is the natural disaster severely damaging peoples' lives and properties. Plastic development process and damage characteristic of single-layer latticed cylindrical shells are studied by investigating curves of several characteristic response targets verifying with the increase of earthquake, from which non-linear time history analysis due to 3-dimension earthquake is calculated. Damage mechanism of such structures is discussed. Furthermore, elasto-plastic earthquake response regularities and damage characteristic for shells with different parameters are summarized herein. The study reveals that although the damage of space frames studied is shown as a sudden increase of displacement response, there must be a certain plastic development process before the failure appears. In fact, the failure of space frames is caused by the incessant interactive actions of the plastic development and deformation. And shells with higher rise-span ratios present apparent characteristic of dynamic instability.