【摘要】 为将ABAQUS梁单元用于钢筋混凝土构件的模拟,根据已有研究,分别定义钢筋、混凝土的本构模型;按照程序提供的UMAT接口格式,采用FORTRAN语言编制纤维模型梁单元的钢筋、混凝土材料用户子程序。讨论ABAQUS中钢筋混凝土梁单元有限元模型的建模方法。通过与拟静力试验及足尺振动台试验结果比较,验证程序及建模方法的可靠性。研究结果表明:所编制的材料子程序能较好地反映任意反复荷载下钢筋混凝土柱的强度及刚度退化现象,广泛适用于复杂结构中弯曲破坏为特征的普通及高强混凝土梁、柱等构件的精细化模拟。更多还原

【Abstract】 In order to use the beam element of ABAQUS for analyzing reinforced concrete members,a steel rebar and concrete constitutive models were presented based on the former research.According to UMAT interface provided by the software,a user subroutine of steel rebar and concrete written in FORTRAN language was developed for fiber beam element.Moreover,modeling methods of reinforced concrete beam element by ABAQUS were discussed at length.By means of comparison with low cycle and iterative static test and full scale shaking table test results,reliabilities of the user subroutine and modeling methods were validated.The results show that the subroutine provided here can well reflect strength and stiffness degradation of reinforced concrete columns produced by arbitrarily cyclic loading both in tension and compression.The subroutine is widely applicable to refined simulation of normal-and high-strength concrete beams and columns or other members characterized by flexural failure in complex large-scale structures widely.更多还原