薄柔H形截面钢构件在横向冲击下的局部屈曲破坏  

Local Buckling of H-shaped Steel Members with Large Width-thickness Ratios Subjected to Lateral Impact

作　　者：陈鹏程 路国运[1] 杨会伟[1] 张恩 CHEN Pengcheng;LU Guoyun;YANG Huiwei;ZHANG En(College of Architecture and Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学建筑与土木工程学院,太原030024

出　　处：《太原理工大学学报》2018年第6期875-880,共6页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(11372209);山西省研究生教育创新项目资助(2017BY047)

摘　　要：通过理论与有限元模拟相结合的方式研究了薄柔H形截面钢构件在横向冲击荷载作用下的局部屈曲变形。首先利用塑性铰线理论建立了受横向冲击荷载作用下刚塑性H形构件局部屈曲的理论模型,得到了构件的能量吸收与塑性铰转角的关系、局部变形、耗能等,并通过有限元模拟进行了验证;随后利用该理论模型重点分析了构件截面几何尺寸对平均力、能量吸收、比吸能等评价构件抗冲击性能的主要指标的影响。研究结果表明该模型可以较为准确地描述薄柔H形构件的局部屈曲破坏,能够更好地预测工程上类似结构的最终变形及能量吸收,为该类构件的抗冲击设计提供了理论支持。The local buckling behavior of H-shaped steel members with large width-thickness ratios subjected to lateral impact was investigated theoretically and numerically.In the theoretical analysis,Yield Line Mechanism was introduced to establish the theoretical model and the idealized plastic material model was adopted.Analytical solutions for the collapse curve were developed,and used to model large deformation behavior and energy absorption.The theoretical results were proved to compare well with the numerical values.Thereafter,the effect of section geometry including flange thickness and web thickness on the energy absorption(EA)average crash force(F avg)and specific absorbed energy(SEA)were analyzed accurately.Moreover,the results of theoretical analysis gave a reliable prediction of deformation and energy absorption for similar members and provided a reference to the research and design for resisting impact of H-shaped members with large width-thickness ratios subjected to lateral impact.

关 键 词：薄柔H形截面 横向冲击 塑性铰线理论 局部屈曲 能量吸收 

分 类 号：TU392[建筑科学—结构工程]