摘要
在冲击、爆炸荷载作用下结构底层柱的破坏可能导致结构的连续倒塌。利用LSDYNA对爆炸荷载下钢筋混凝土柱的动力响应进行了数值模拟。建立了三维实体钢筋混凝土柱模型,爆炸荷载施加在柱子的前表面。钢筋采用塑性硬化模型。混凝土材料采用脆性损伤模型,考虑了损伤及应变率效应。分别对矩形截面、方形截面的柱子在不同折合距离时的侧向位移和失效情况进行了分析。从结果可以看出,在配筋率相似的情况下,截面面积对柱子的动态响应具有显著的影响。当折合距离约为2.0时,爆炸荷载对两种截面钢筋混凝土柱的影响均可以忽略不计。
The failure of the reinforced concrete （RC） column on the ground floor may result in progressive collapse of the whole building. The RC columns subjected to the blast pressure were analyzed with the finite element program LS-DYNA. A three dimensional solid model was established for the RC column. Blast loads were applied over the front face of the column. The isotropic and kinematic hardening plasticity material model was applied to the reinforcement. A brittle damage model was applied to simulating the concrete. The damage and strain rate effect were considered in this model. The lateral displacement and failure mode of square column, rectangular column under different blast load of corresponding scaled distance were investigated and discussed. It can be found from the results that the area of the cross section has significant influence on the dynamic response of the column with the similar reinforcement ratio. The influence of blast pressure can be neglected for the two types of column when scaled distance is 2.0.
出处
《解放军理工大学学报（自然科学版）》
EI
2007年第5期525-529,共5页
Journal of PLA University of Science and Technology(Natural Science Edition)
基金
陕西省自然科学基金资助项目(2005E204)
关键词
爆炸荷载
钢筋混凝土柱
脆性损伤模型
应变率效应
折合距离
blast load
reinforced concrete column
brittle damage model
strain rate effect
scaled distance
