冷弯薄壁型钢C型构件滞回性能

对7根冷弯薄壁型钢C型构件进行了竖向常轴力作用下,水平循环荷载加载试验,以探索冷弯薄壁型钢C型构件滞回性能特点及其影响因素.试验反映了轴压比、截面宽厚比对试件破坏形式,能量耗散等滞回性能相关参数的影响.还重点研究了组合效应对滞回性能的改善作用.试验结果表明:大轴压比对试件的滞回性能有极大的削弱作用；试件通过组合,滞回性能得到一定的改善.此外,建立了有限元数值模型,考虑几何和材料非线性,将分析结果与试验进行对比分析,验证了试验结果的正确性,得到过早出现局部屈曲是构件破坏关键原因的结论.最后,总结了冷弯薄壁型钢的滞回性能特点,对其在结构体系中的应用提出了建议.

Analysis of Hysteretic Performance of C-section Specimens of Cold-formed Steel

Seven specimens were loaded with axial force and horizontal cycle force to analyze the hysteretic performance and the influencing factor as well.The influence of axial compression ratio and aspect ratio on the hysteretic performance was investigated,including the buckling behaviors and the energy dissipation.And the positive role of combined effects on the hysteretic performance of cold-formed specimens was studied emphatically.The experiment reveals that a large axial compression ratio incurs a serious decrease on hysteretic performance,while the combined effects give an increase on it.In addition,the numerical mode is set up.Considering double nonlinearity,the results of experiment and simulation match each other well.Based on the data,it is obtained that local buckling plays a great negative role during the loading course.At last,the characteristics of hysteretic performance of cold-formed steel specimens are concluded and some suggestions are given.