循环荷载作用下冷弯薄壁矩形截面构件的破坏行为及影响参数  

Failure behavior and influencing parameters of cold-formed thin-walled steel members with rectangular cross-section under cyclic loads

作　　者：杨娜[1] 仲亚囡 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北新建材集团有限公司,北京10048

出　　处：《振动与冲击》2013年第19期12-16,92,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50778019;50938008);新世纪优秀人才支持计划资助(NCET-11-0571);中央高校基本科研业务费专项资助(2012TBM007)

摘　　要：完成了6个壁厚低于3 mm的冷弯薄壁矩形截面钢压弯足尺构件拟静力试验,研究其在常轴力循环弯矩作用下的滞回性能,并对其破坏行为、滞回曲线、骨架曲线、耗能及延性性能等进行了综合分析。在试验研究结果的基础上,基于ANSYS软件,建立了冷弯薄壁矩形截面钢构件数值分析模型,完成了其滞回性能的参数分析。分析结果表明,轴压力对塑性屈曲后构件的承载力、刚度及延性性能有劣化作用;存在最优截面高宽比组配,使得构件的延性性能最佳,当高宽比其超过最优截面高宽比值,随高宽比增大延性变差;长细比越大,构件的极限承载能力、变形能力及耗能能力越差。A quasi-static test for hysteretic behavior of rectangular cross-section steel column-beam members under constant axial compression and cyclic bending loads was performed. Their failure behavior, hysteretic curves, skeleton curves, energy-dissipation performances and ductility capacity were analyzed comprehensively. Based on the true rules of test results, parametric studies with the finite element software ANSYS were conducted to investigate their hysteretic capacity. Analysis results showed that axial compression weakens their load-carrying capacity, rigidity and ductility performances at plastic post-buckling stage; there exists the optimal cross-section height-width ratio brining the best ductility capacity; the ductility capacity tends to be worse when the height-width ratio exceeds the optimal value; with increase in slenderness ratio, their ultimate load-carrying capacity, deforming capacity and energy-dissipation capacity become worse.

关 键 词：冷弯矩形截面钢 拟静力试验 破坏行为 影响参数 

分 类 号：TU391[建筑科学—结构工程]