带下部支承柱单层球面网壳结构抗冲击动力性能研究  

Shock resistance performance of single-layer spherical reticulated dome with lower supporting column

作　　者：马肖彤[1,2] 王秀丽[1,2] 冉永红[1,2] 吴长[1,2] 

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《振动与冲击》2015年第24期170-176,共7页Journal of Vibration and Shock

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

摘　　要：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。In order to study the shock resistance of single-layer reticulated dome with lower supporting columns,a large number of examples was analysed. The impact modes and energy transfer / conversion relations were summerized making use of various impact models of the whole structure,as the lower columns were subjected to impact loading. A regularity analysis was made from the following three aspects： 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 increase with the increase of impact height,while the energy decreases firstly and then increases. The displacement and stress increases with the increase of impact mass and speed. The 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 

分 类 号：TU391[建筑科学—结构工程]