汽车撞击下钢筋混凝土框架的动态响应与破坏模式研究

摘要

为了研究汽车撞击下钢筋混凝土整体框架结构的动态响应、损伤机理及破坏模式,运用显式动力分析软件ANSYS/LS-DYNA建立6层钢筋混凝土框架结构模型,并对不同车速撞击下汽车与钢筋混凝土框架角柱和边中柱的破坏过程进行仿真模拟.结果表明:汽车撞击角柱和边中柱的损伤破坏过程相同;最大碰撞力与撞击速度呈线性关系;中国规范对汽车等效碰撞力的取值偏于不安全;在汽车的撞击作用下,被撞柱柱底发生弯剪破坏,柱顶发生剪切破坏,结构的动态反应具有局部性,只与被撞柱及周围相邻的构件有关.%In order to study the dynamic response , damage mechanism and failure mode of reinforced concrete (RC) frame ,explicit dynamic analysis software ANSYS/LS-DYNA was used to build a model structure of six-story reinforced concrete frame ,then the damage processes of corner column and side column of the reinforced concrete frame under vehicle impact with different speeds were simulated .The results show that the failure process of corner column is same with the failure process of side column under vehicle impact .The relationship of maximum impact force and impact velocity is linear .Equivalent value of the car collision force in Chinese specification is unsafe .Under vehicle impact ,the bending shear failure occurs at the bottom of the column ,and the shear failure occurs at the top of the column ;the dynamic response of the structure has limitations ,and it is only related with the collision column and the surrounding adjacent members .