为了研究带下部支承柱单层网壳结构的抗冲击动力性能,基于对468个算例的分析,总结了下部支承柱受冲击作用时整体结构的冲击模式特征和能量传递转换关系;并分别从不同冲击点高度、冲击物质量及速度三个方面进行规律性研究。研究结果表明:根据动力响应特性不同,可将整体结构的冲击模式分为四种;在首次冲击过程中,结构的应变能约占总能量的10%~40%而不可忽略;随着冲击高度的提高,结构的位移和应力随之增大,而结构获得的能量则先减后增;结构的位移和应力都随着冲击物质量和速度的增大而增大,能量分配比例以质量比1.0为临界点。
Abstract
In order to study the shock resistance of single-layer reticulated dome supported with lower columns, analysis of a large number of examples was done. The impact modes and energy transfer/conversion relation in various impact models of whole structure as the lower column subjected to impact loading were summed. Regularity analysis was done from three aspects of different impact height, mass and speed. The results show that the impact modes of structure under impact loads can be divided into four types. During the first impact, the strain energy of structure accounts for about 10% ~ 40% of the total energy and it can’t be neglected. The displacement and stress of structure increased with the increase of impact height, while the energy decreased firstly and then increased. The displacement and stress increased with the increase of impact quality and speed, Mass ratio of 1.0 can be taken as the critical point of energy distribution.
关键词
冲击荷载 /
能量转换 /
冲击速度 /
应变能 /
网壳结构
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Key words
impact loads /
energy transfer /
impact velocity /
strain energy /
shells
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