下部支承柱受冲击作用时单层柱面网壳的动力响应分析  

Dynamic response analysis of single-layer cylindrical reticulated shells under impact loads on substructure columns

作　　者：孙宏超 王军林[1] 赵淑丽[1] 李红梅[1] 孙建恒[1] SUN Hong-chao;WANG Jun-lin;ZHAO Shu-li;LI Hong-mei;SUN Jian-heng(College of Urban and Rural Construction,Agricultural University of Hebei,Baoding 071001,China)

机构地区：[1]河北农业大学城乡建设学院,河北保定071001

出　　处：《空间结构》2021年第1期16-23,共8页Spatial Structures

基　　金：河北省自然科学基金项目(E2018204019,E2020204031);河北省重点研发项目(19211502D);河北省教育厅青年基金项目(QN2018256);河北农业大学理工基金重点项目(ZD201704,LG201713)。

摘　　要：为研究单层柱面网壳在下部支承结构受到冲击荷载作用时的动力响应,建立带有下部支承柱的36m×20m三向网格网壳,根据结构的应力和变形,将结构在冲击荷载作用下的动力响应分为3种模式.分析了网壳在不同响应模式下的变形特征,并对冲击荷载作用下的网壳结构塑性发展规律进行了研究.通过改变冲击物的质量、冲击速度和冲击作用点的位置,讨论冲击能量和冲击高度对结构响应的影响.研究结果表明:冲击能量越大时,网壳变形越大;冲击动能相同时,冲击物质量越大时,网壳变形越大;冲击作用高度越大,结构受损越严重;冲击力的大小随冲击高度的变化为先减小后增大,且在高度最低时,取到最大值.In order to research the dynamic response of single-layer cylindrical reticalated shells with supporting column subjected to impact loads, a 36 m×20 m three-dimensional reticulated shell is established for analysis. According to the stress distribution and deformation of the structure, the dynamic response of the structure under the impact load is divided into three modes. The deformation characteristics of reticulated shells in different response modes are analyzed, and the plastic development of reticulated shells under impact loads is studied. Effects of impact energy and impact height on structural response are discussed by changing the mass of the impact object, the impact velocity and the position of the impact point. The results show that the greater the impact energy is, the greater the deformation of the reticulated shell will be. When the impact kinetic energy is the same, the deformation of the reticulated shell increases with the increase of mass of the impact object. The more serious damage to the structure will be caused with the increase in the height of the impact loads, and the impact force decreased first and then increased. When the height of the impact is lowest, the impact force is maximum.

关 键 词：柱面网壳 下部支承 冲击荷载 响应模式 塑性发展规律 

分 类 号：TU393.3[建筑科学—结构工程]