Numerical simulation method for reinforced concrete columns based on modified Bouc-Wen model
In order to simulate the mechanical properties of reinforced concrete(RC)columns within nonlinear state,In this paper,an modified Bouc-Wen model is proposed to improve the Bouc-Wen-Baber-Noori(BWBN)model from the aspects of stiffness degradation,pinching effect and asymmetric characteristics.In the meantime,an identification method of model parameters is established by combining parameter normalization processing and chaotic particle swarm optimization algorithm.Furthermore,secondary development for modified Bouc-Wen material is presented in OpenSees.Afterwards,the proposed material is applied to describe the moment-rotation relationship of plastic hinge of RC columns and numerical modeling of RC columns based on concentrated plastic hinge is completed.According to the low-cyclic loading test data of RC columns,the hysteretic characteristics of RC columns are described by directly identifying the horizontal force-displacement curve and numerical modeling based on lumped plastic hinge model.The results show that the accuracy of the modified Bouc-Wen model is significantly higher than that of BWBN model.The calculation accuracy of fiber model depends on the accuracy of components information,which fails to simulate the nonlinear response of RC columns after performance change.The numerical modeling method based on the modified Bouc-Wen model can rationally simulate the degradation,pinching effect and asymmetric characteristics of RC columns after earthquake damage.
RC columnlumped plastic hinge modelBouc-Wen modelparameter identification
NETL
NSTL
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