钢材模型强化参数对构件滞回性能模拟的影响分析

Effect of the Hardening Parameters in Steel Constitutive Models on the Hysteretic Behavior of Structural Members

为了考察材料本构模型参数对构件滞回性能模拟的影响,利用通用有限元软件ABAQUS对H形截面钢构件绕强轴压弯的滞回特性进行了数值模拟研究,对比分析了Ramberg-Osgood模型应变硬化指数和两折线模型强化率的参数取值对低周往复荷载作用下构件的极限抗弯承载力、极限后性能模拟结果的影响。分析表明,在所研究的材料强化参数变化范围内,构件极限抗弯承载力的相应变化是有限的;但构件的残余位移、耗能能力等大范围塑性变形阶段的模拟结果对两类材料模型强化参数均表现出很强的敏感性。基于以上分析结果,建议在对构件性能进行全过程数值模拟时应当谨慎地选用材料强化参数,并在必要时补充相应的材料性能试验。

This paper presents a study on the effect of material parameters on the hysteretic behavior of steel members. The hysteretic characteristics of H-sectional cantilever beam columns are systematically investigated utilizing ABAQUS software. Firstly the accuracy of finite element models is verified by comparing with previous experimental results. Then the comparisons of ultimate capacity and post ultimate behavior in large plastic deformation of those beam- columns are carried out based on changes of hardening parameters both in Ramberg-Osgood and bilinear material models. Analysis results show the impact of hardening parameters on ultimate capacity is limited. However, the numerical results of residual displacement and energy dissipation capacity are affected significantly by the two hardening parameters, which can not be ignored in the large plastic deformation simulation. Based on the analysis results, it is recommended to select the hardening parameters carefully and to supplement necessary mechanical property testing for accurate simulation of hysteretic behavior.