A DAMAGE MODEL FOR REINFORCED CONCRETE MEMBERS BASED ON MATERIAL DAMAGE

Considering the damage mechanism of reinforced concrete structures under seismic excitations, the stiffness degradation and the free energy degradation of damaged reinforced concrete members based on the damage models for steel and concrete are deduced and further combined to form a damage model for reinforced concrete members. The pseudo-static tests of reinforced concrete columns are simulated. The analytical results indicate that the proposed damage model can describe the damage evolution process of reinforced concrete columns well, and quantitatively determine the damage level of reinforced concrete piers in the orthogonal direction to a unique loading. The shaking table test data of reinforced concrete piers and a numerical example of reinforced concrete rigid frame bridges are analyzed, and results show that the proposed damage model can describe the degradation of seismic resistance of the reinforced concrete piers and predict the failure mode of structures. Thus it can be used to analyze the damage of bridges under seismic excitations.