RC悬臂柱抗冲击响应数值模拟分析  

Numerical simulation analysis of resisting impact response of RC cantilever column

作　　者：张莉 廖俊智 何勇 ZHANG Li;LIAO Junzhi;HE Yong(School of Architectural Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《四川建筑科学研究》2022年第6期1-7,共7页Sichuan Building Science

基　　金：昆明理工大学分析测试基金(2020M20192210048)。

摘　　要：为了研究冲击速度和冲击位置对圆形截面RC悬臂柱抗冲击响应的影响,采用LS-DYNA非线性显示动力分析程序,在对比吴吉光的试验结果并验证有限元模型可靠性的前提下,进行了6个不同工况下的圆形截面RC悬臂柱抗冲击试验模拟研究,提取了冲击力-水平位移曲线、沿柱高水平位移分布和系统能量时程曲线,并分析了破坏模态。结果表明:由于应变率增强效应相对于时间尺度出现滞后,RC悬臂柱达到最大冲击力时的水平位移随着冲击速度的增加而轻微增加;随着冲击速度的增加,RC悬臂柱柱体的局部侵蚀现象逐渐消失,同时趋向柱体的整体破坏响应;随着冲击位置靠近约束端,在冲击过程中RC悬臂柱柱体所需的耗能时间逐渐缩短。In order to study the influence of impact velocity and impact position on the resisting impact response of circular cross﹣section RC cantilever column,using LS﹣DYNA nonlinear explicit dynamic analysis program,on the premise of comparing Wu’s test results and validating the reliability of the finite element model,the resisting impact test simulation of circular cross﹣section RC cantilever column under six different working conditions was carried out.The impact force﹣horizontal displacement curve,the horizontal displacement distribution along the column and the energy time history curve of the system were extracted,and the failure modes were analyzed.The results show that because the strain rate enhancement effect lags behind the time scale,the horizontal displacement of the RC cantilever column increases slightly with the increase of the impact velocity,and the local erosion of the RC cantilever column gradually disappears with the increase of the impact velocity,and tends to the overall failure response of the column.As the impact position is close to the constraint end,the energy dissipation time of the RC cantilever column is gradually shortened in the impact process.

关 键 词：RC悬臂柱 抗冲击响应 有限元 LS﹣DYNA 破坏模态 能量耗散 

分 类 号：TU375.3[建筑科学—结构工程]