应用OpenSEES模拟方钢管混凝土柱的抗震性能

Application of OpenSEES on calculating lateral force-displacement Hysteretic Curves of Concrete-filled rectangular steel tubular columns

应用OpenSEES有限元软件计算方钢管混凝土柱的水平力-位移滞回曲线。考虑到钢管与混凝土相互作用的机理,采用Mander混凝土本构模型,计算结果与试验结果吻合较好。在此基础上对方钢管混凝土柱进行了参数分析,讨论了纤维模型数量、单元划分数量和材料本构等因素的影响。结果表明:基于OpenSEES建模方式与模型参数选取合理;增大钢材屈服强度,可以提高方钢管混凝土柱水平承载力,混凝土强度对方钢管混凝土柱的水平承载力影响则不大。

The lateral force-displacement hysteretic curves of concrete - filled rectangular steel tubular （CFRST） columns were calculated by OpenSEES based on the fiber model. Based on the interaction theory mechanism be- tween concrete and steel inside CFRST columns under low cycle load, a numerical analysis was carried out by using the Mander confined concrete constitutive model and the results predicted by model were in good agreement with those of experiments. Parameter analysis of hysteretic behavior of CFRST columns were carried out. The influence of fiber model＇ s quantity, element＇ s quantity and material constitutive etc. was discussed. The calculated results indicate that： OpenSEES model and the model parameters were reasonable. To increase the yield strength of steel can improve the horizontal bearing capacity of CFRST columns and the horizontal bearing capacity has very little in- fluence on concrete strength.