【摘要】 为了满足结构在地震作用下进行非线性响应分析的需求,合理准确地把握钢筋混凝土梁柱杆件的弹塑性受力特性,建立用于ABAQUS软件显式分析的钢筋单轴本构模型。该本构模型合理考虑Bauschinger效应及加卸载规则,并基于ABAQUS用户子程序接口VUMAT对其进行二次开发,编制梁单元钢筋本构模型的计算程序,并对往复荷载下钢筋混凝土柱受力性能进行数值模拟。与ABAQUS自带的钢筋本构模型相比,所给出的钢筋本构模型能够较好地反映钢筋混凝土柱在低周往复荷载作用下的滞回性能及轴力-双向弯曲耦合性能,能够用于钢筋混凝土杆系结构在多维受力状态下的动力非线性响应分析。更多还原

【Abstract】 A uniaxial constitutive model of steel is presented in this paper,which is applied to the explicit dynamic module of ABAQUS.The model is represents the Bauschinger effect by a simple expression.It also reasonably considers the stress-strain behaviour of reinforcing steel upon reversal of load.The material subroutine of this model is successfully developed by means of user-defined subroutine interface(VUMAT).In addition,the hysteretic performance of RC columns under cyclic loading is numerically simulated.Compared with the steel constitutive model of ABAQUS,the results show that the model of this paper can more rightly simulate the hysteretic performance of RC columns under the multiaxial load.Especially the biaxial bending coupling effect of the speciments is analyzed accurately.The established model can be used to analyzing the nonlinear behavior of RC column-beam element under the multiaxial loading conditions.It also can meet the demand of analyzing the nonlinear dynamic response of structures under the seismic loads.更多还原