Abstract: In view of the large dispersion of concrete materials and the uncertainty of constitutive parameters, a nonlinear constitutive parameter identification method for reinforced concrete structures based on RSM-CMA was proposed. First, the uniform way between the concrete damage plasticity model with constitutive model provided by the specification was discussed, concrete material subroutine was developed, and the sensitive parameters influencing uniaxial stress-strain curve was obtained, the suggested values of parameters such as yield surface function and plastic potential function in the CDP were given. Secondly, the explicit expression of the implicit relation between the structural macro response and the mesoscopic constitutive parameters was realized on the basis of RSM, and the objective function constructed by the least square principle with constraints was realized by CMA. Finally, a numerical example of a reinforced concrete arch member was given to illustrate the accuracy of the proposed method. Result shows that compressive strength and peak compressive strain are the constitutive sensitivity parameters of concrete. The effects of constitutive parameter on the ultimate bearing capacity decreased in order of compressive strength, the modulus of elasticity and the peak compressive strain. The algorithm presented can accurately identify the constitutive parameters of the material, and is helpful for the accurate acquisition of the macro response at the structural level. It can provide a reference for the identification and acquisition of the constitutive parameters of materials under limited information.
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2018, Vol. 32 
