柱承式网架结构在连续爆炸荷载作用下的动力响应  

DYNAMIC RESPONSES OF A COLUMN-SUPPORTED SPACE GRID STRUCTURE UNDER MULTIPLE BLAST LOADS

作　　者：董晓鹏[1] 王小盾[1] 陈志华[1] 常利[2] 刘大亭[3] Dong Xiaopeng Wang Xiaodun Chen Zhihua Chang Li Liu Dating(School of Civil Engineering, Tianjin University, Tianjin 300072, China Tianjin Binhai Mass Transit Development Co. Ltd Tianjin 300451, China China Railway 18th Bureau Group the 4th Engineering Co. Ltd, Tianjin 300350, China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津滨海快速交通发展有限公司,天津300451 [3]中铁十八局集团第四工程有限公司,天津300350

出　　处：《钢结构》2017年第1期1-5,共5页Steel Construction

摘　　要：利用ABAQUS有限元软件对柱承式网架结构在连续两次爆炸荷载作用下的动力响应进行数值模拟。结果表明:第一次爆炸后网架的部分杆件屈服,结构整体产生了一定残余变形,这些结构损伤加剧了第二次爆炸荷载作用下结构的破坏;屋顶的爆炸荷载导致该网架结构产生较大的下挠,故在有类似抗爆需求的大跨屋盖设计中,屋顶的爆炸荷载必须引起足够的重视;网架平板支座的抗剪连接构造是柱承式网架结构抗爆的薄弱环节并提出了几种提高网架支座抗剪承载力的加固措施。Numerical simulation of dynamic responses of the column-supported space grid structure was carried out based on ABAQUS finite element software under multiple blast loads. The results showed that after the first explosion,partial bars entered the yield stage,and there was a large residual deformation in the structure,so the structural damage aggravated the destruction of the structure under the second blast loads. Because of the serious deflection of the space grid,when designing large-span roof structures under the similar blast loads,the blast loads on the roof must be paid more attention. The shear-resist ability of bearings of space grid is a weak link in the column-supported space grid for blast resistance. Finally,some measures to improve the shear capacity of the bearings were listed.

关 键 词：连续爆炸 网架结构 网架支座 动力响应 有限元分析 

分 类 号：TU356[建筑科学—结构工程] TU311.3