核爆冲击波作用下空心砌块墙对主体结构的作用  

EFFECTS OF CONCRETE MASONRY WALLS ON STRUCTURES UNDER NUCLEAR BLAST LOADINGS

作　　者：张正威[1] 宋二祥[1] 陆新征[1] 陈肇元[1] 

机构地区：[1]清华大学土木工程系

出　　处：《工程力学》2008年第5期73-78,共6页Engineering Mechanics

基　　金：国家人防办基金资助项目

摘　　要：该文采用显式动力有限元软件LS-DYNA对核爆冲击波作用下高层建筑混凝土小型空心砌块外墙(以下简称砌块墙)的破坏模式进行了数值模拟,计算模型考虑了材料非线性、接触非线性、大应变、大变形等主要特征。在此基础上讨论了砌块墙在破坏飞散过程中传给结构的荷载,得到了不同冲击波超压作用下砌块墙传给结构的荷载时程。计算结果表明:核爆冲击波作用下,砌块墙的破坏模式与冲击波超压的大小有关;其传给结构的荷载时程基本呈三角形分布,荷载峰值随超压的增加而增大,墙体顶部与结构构件之间接触面的允许抗剪强度对荷载峰值时间和持续作用时间起关键作用。Concrete masonry walls subjected to blast loadings were analyzed with the explicit dynamic finite element method. The nonlinear material properties, nonlinear contact, large strain, large displacement were considered in the analysis model. The effects on high rise building caused by masonry wall deformation and failure under blast loadings were discussed. The loading time history on high rise building caused by masonry wall failure is presented. The numerical results show the mode of failure of masonry walls is significantly influenced by the strength of blast wave. The induced forces of structures are of triangle pattern, the larger the strength of blast wave, the higher the peak value of forces. The critical shear strength of mortar between masonry wall and the structural members played an important role on the moment of peak forces and the duration of forces.

关 键 词：核爆冲击波 空心砌块墙 高层建筑 作用 有限元分析 

分 类 号：TU522.3[建筑科学—建筑技术科学] TU973