汽车炸弹袭击下高层框剪结构数值模拟  

Numerical Simulation of 18 Story Frame Shear Structure Under Car Bomb Attack

作　　者：许成龙 周强[1] 李克璋 刘齐民 XU Cheng-long;ZHOU Qiang;LI Ke-zhang;LIU Qi-min(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070

出　　处：《武汉理工大学学报》2024年第6期40-45,共6页Journal of Wuhan University of Technology

基　　金：基础加强计划项目子课题(2022JCJQZD03803)。

摘　　要：基于显式动力分析软件LS-DYNA,采用多尺度和流固耦合相结合的建模方法,模拟18层框剪结构在汽车炸弹袭击下的动力响应和破坏模式。保持比例距离不变,分别将炸药置于长边中柱和L型剪力墙前方研究不同工况下炸药距离和当量对高层框剪结构的破坏作用。对比分析剪力墙在正面和侧面爆炸冲击下的破坏模式。结果表明:当比例距离一定时,TNT当量越大,爆源距离结构越远,造成的破坏越严重。爆炸荷载下框剪结构破坏程度从大到小依次为:楼板、剪力墙、框架梁、框架柱。单片剪力墙底部在汽车炸弹袭击下易发生弯剪破坏,L型剪力墙在正面爆炸冲击下发生较大的弯曲破坏,并且墙角处出现巨大裂缝。Multi-scale with ALE method was used to simulate the dynamic response and damage mode of 18-story frame-shear structure under car bomb attack based on the explicit finite element software LS-DYNA.The effects of differ-ent explosive distances and TNT amounts were investigated on the damage behavior of the high-rise frame-shear struc-ture,in which the TNT were placed on the middle column of long side and the front of the L-type shear wall.Then the fail modes of shear walls were compared.Results show that when the scaled distance is constant,a larger TNT equivalent weight and a greater distance from the source to the structure result in more severe damage.The damage degree of frame-shear wall structure under explosive loading is as follows:floor slab,shear wall,frame beam,and frame column.The bot-tom of a single shear wall is prone to bending-shear failure under car bomb attack,while the L-shaped shear wall is prone to bending failure under frontal explosion impact,and there are huge cracks in the corner.

关 键 词：数值模拟 多尺度 流固耦合 汽车炸弹 框剪结构 

分 类 号：TU318[建筑科学—结构工程]