冷成型薄壁C型钢构件压弯滞回性能的数值分析

应用大型有限元软件ABAQU S,采用考虑几何和材料非线性的S4R 5壳单元和线性随动强化模型,考虑角部冷成型强化效应的影响,建立了常轴力、循环弯矩荷载作用下的C型钢构件有限元模型,分析了构件宽厚比和轴压比对冷成型薄壁C型钢构件滞回性能的影响。分析结果表明:宽厚比和轴压比对构件滞回性能影响显著,随着宽厚比的增加,构件承载、转动以及塑性变形能力降低;随着轴压比增加,构件的最大承载力降低,承载力退化。

Numerical Analysis of the Hysteretic Behavior of Cold-formed Thin-Wall C Steel Members under Constant Compression and Cyclic Bending

By using the finite element analysis program ABAQUS,S4R5 general-purpose shell elements are employed for establishing the finite element models of cold-formed thin-wall C-section steel members under constant compression and cyclic bending.The geometric and material nonlinearities,the linear kinematic hardening and the effect of strain hardening at corner zone by cold-forming are taken into account in the model.The effect of the width-to-thickness ratio and the axial compressive ratio on the hysteretic behavior of the cold-formed steel members are analyzed.Analytic results indicate that the width-thickness ratio and the axial compressive ratio affect the hysteretic behavior of the member evidently.With the increase of the width-thickness ratio,the resistance,rotation capacity and plastic deformation capacity decreases.With the increase of the axial compressive ratio,the ultimate resistance decreases and the resistance degenerates.