纤维梁单元模型中钢筋模拟方法对比研究

Comparative study on simulation methods of steel bar in fiber beam element model

对ABAQUS纤维梁单元模型中钢筋的模拟方法进行对比,并对钢筋混凝土框架结构隐式和显式弹塑性时程分析结果进行比较。钢筋混凝土纤维梁单元中钢筋可以采用钢筋纤维法和组合单元法两种方法进行模拟,对这两种钢筋模拟方法进行了详细对比分析,并对隐式动力时程分析和显式动力时程分析结果进行了比较。结果表明,两种钢筋模拟方法可以得到相近的时程分析结果,编制的显式混凝土单轴动力本构是正确的。

Simulation methods of steel bar in fiber beam element model were compared on the basis of ABAQUS,and a contrast analysis was also carried out between time history results obtained from implicit and explicit dynamic analysis methods respectively,and a reinforced concrete frame structure subjected to earthquake was taken as an example.Steel fiber method and combined finite element method can be applied to model the reinforced concrete beam element.The results obtained from the two methods,and also from implicit and explicit dynamic analysis methods were compared in detail,respectively.It is demonstrated that the results based on the two simulation methods of steel bar are consistent with each other,and the uniaxial constitutive model of concrete in the case of explicit dynamic analysis is correct.