DEVELOPEMENT AND APPLICAYION OF MATERIAL CONSTITUTIVE MODELS BASED ON ABAQUS/EXPLICIT BEAM ELEMENTS

The current status of steel and concrete uniaxial constitutive models was reviewed briefly.Based on the former research,constitutive models of steel and concrete were presented,which can consider the Bauschinger effect and stiffness degradation of steel,the strength and stiffness degradation of concrete under arbitrarily cyclic loading.Also,modeling methods of reinforced concrete beam elements and some measures using an explicit method for static and dynamic analyses were discussed at length.According to the demand of ABAQUS/Explicit package’s VUMAT pattern,a user subroutine for fiber beam elements written in FORTRAN language was developed.By means of the comparison with the pseudo-static test and full scale shaking table test results,the reliability of user subroutine,also,modeling methods were validated.The results show that the user subroutine proposed here are applicable to refined the simulation of normal- and high-strength concrete beams &columns or other components characterized by flexural failure in complex large-scale structures widely.