Calibration of Parameters for the Concrete Cap Model and Its Applications in Simulating Impact-induced Damage in Bridges
The response of concrete under an impact load is closely related to the loaded stress state and the strain rate.Numerical analysis faces challenges such as constitutive model complexity,large parameter numbers,and difficulties associated with engineering applications.This paper presents a method,based on the elasto-plastic damage cap model,for determining the damage parameters and the rate-dependent parameters of the concrete constitutive model,considering the concrete damage characteristics under the stress states of tension,compression,and torsion.Then,regarding the bending and shear failure modes of reinforced concrete(RC)members subjected to impact loading,the reliability of the parameter values for the concrete constitutive model is verified and validated by experiments on the RC members.The focus is the dependency of the damage parameters on the element size and the necessity of simulating shear dilation damage.Two commonly used elasto-plastic damage cap models are also compared.Then,a navigational bridge failure accident induced by a vessel collision is simulated and verified.The results indicate that the proposed parameter calibration method effectively predicts the damage evolution and the dynamic responses of the RC members under impact loading.It addresses application challenges,such as the calibration of excessively many parameters in the elasto-plastic damage cap model,and provides a reference for the numerical analysis of impact on concrete bridge structures.
bridge engineeringconcrete bridgeelasto-plastic cap modelparameter calibrationlow-velocity impactsimulation verification