外爆荷载下 Kiewitt 8型单层球面网壳的动力响应

摘要

为研究Kiewitt 8型单层球面网壳在爆炸荷载下的动力响应，基于LS-DYNA建立了爆炸中考虑附属结构（檩托，檩条，铆钉和屋面板）影响的40 m 单层球面网壳结构有限元模型。通过分析相同爆炸荷载下不同结构矢跨比，构件尺寸和材料属性等参数对结构响应的影响，得到了球面网壳的矢跨比、杆件截面、屋面板厚度及屋面活荷载等是影响结构动力响应的主要因素。在此基础上，通过讨论相同结构在不同爆炸作用下的结构破坏及倒塌情况，提出了单层球面网壳在外爆荷载下安全距离的计算方法，为更好地建立网壳结构的抗爆设计方法和安全评估理论提供了依据。%In order to study the design methods of single-layer reticulated domes,the FE model for a Kiewitt 8 dome of 40 m span under explosion loads was built with the explicit FE packages LS-DYNA to investigate its dynamic responses considering the effects of non-structural components including purlins,purlin props,rivets and roof panels.The blast loading was generated with ConWep,and applied on the dome directly.The effects of different structural ratios of rise to span,component sizes and material properties,etc parameters on the dome's dynamic responses were also analyzed.The results showed that the ratios of rise to span,sizes of cross sections,thicknesses of roof panels and live loads are the main factors to affect the dome's dynamic responses.At last,the concept and calculation method of safety distance for single-layer reticulated domes subjected to outside explosion were proposed.