冲击荷载下单层网壳结构的整体倒塌分析  

Analysis of Overall Collapse of Single-Layer Reticulated Shell under Impact Load

作　　者：王秀丽[1] 王昊[1] 赵丽洁[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《甘肃科学学报》2015年第3期62-66,共5页Journal of Gansu Sciences

基　　金：国家自然科学基金项目(51278236);国家科技支撑计划(2011BAK12B07)

摘　　要：对60m跨度的K6型单层球面网壳建模,利用ANSYS/LS-DYNA对其在不同质量及速度冲击物作用下的动力响应进行大量参数化分析。提取了关键节点的位移时程曲线,针对损伤最严重的整体倒塌模式进行了研究。得出了网壳结构在冲击荷载作用下出现整体倒塌现象与冲击物动能及节点位移的关系以及冲击过程动能传递率的分布规律。研究结果表明,冲击物质量越大,使K6网壳发生倒塌所需动能越少;当冲击物作用使关键节点的竖向位移值大于临界位移值时,网壳结构会发生倒塌现象;当冲击物携带动能为临界倒塌冲击动能时,冲击过程的动能传递率最大。A model for the Kiewitt6 single-layer reticulated shell with a span of 60m was established and ANSYS/ LS-DYNA was adopted to analyze the parameters of the dynamic response to impact of different masses and veloci ties. The concepts of critical impact kinetic energy and kinetic energy transmissibility were introduced and the displacement time-history curve of the key node was obtained to study the overall collapse mode. The kinetic energy transmissibility and relation between impact kinetic energy and the displacement of nodes during the overall collapse of the reticulated shell under impact load was studied. The results showed that the more the impact weight was, the less the kinetic energy was needed for the collapse of the Kiewitt6 singlelayer reticulated shell,the reticulated shell collapsed when the vertical displacement of the key node under impact exceeded the critical displacement, and when the impact kinetic energy equaled the critical collapse kinetic energy, the transmissibility of kinetic energy maximized in the course of impact.

关 键 词：冲击荷载 单层网壳结构 有限元分析 整体倒塌 临界冲击动能 动能传递率 

分 类 号：TB115[理学—数学]