冲击荷载下网壳结构的失效模式及其动力响应特性

为系统全面确定网壳结构的冲击失效模式, 通过大量的参数计算研究网壳结构(包括Kiewitt-8型球面网壳、短程线型球面网壳、肋环斜杆型球面网壳、柱壳)的冲击响应特性, 并以Kiewitt-8型单层球面网壳为例, 总结分析网壳结构冲击失效的4个典型算例, 详述各类失效模式下网壳结构冲击失效的全过程及其荷载作用、结构特征响应、能量传递与转化特点;然后依据不同冲击荷载下网壳的冲击失效特点, 定义了网壳结构的3类失效模式(结构局部凹陷、结构整体倒塌、结构冲切破坏)。为揭示网壳结构的冲击失效机理并提出防护建议做了基础性工作。

FAILURE MODES AND CHARACTERISTICS OF DYNAMIC RESPONSE FOR RETICULATED SHELLS UNDER IMPACT

Based on the results of a large number of parametric analyses for failure modes of reticulated shells, the typical examples of Kiewitt-8 single-layer reticulated domes subjected to impact have been illustrated. The reticulated dome contains a Kiewitt-8 single-layer reticulated dome, a Geodesic dome, a Schwedler Reticulated Dome and a Cylindrical Lattice shell. Then the whole course of failure cased by the impact and the characteristic of loading, the characteristic response and energy transfer and conversion are described in detail. Based on the studies above, three failure modes of a reticulated shell under impact are defined as the local dent of a structure, the global collapse of a structure and the punching failure of a structure. The above work makes the preparations for the research on impact failure mechanism and a protection method.