ABSTRACT
In order to explore the influence of different curing conditions on the seismic capacity of reinforced concrete (RC) piers in construction, the mechanical properties of concrete under different curing conditions were tested. Based on the experimental data of concrete mechanical properties and numerical simulation method, the finite element models of RC piers under different curing conditions are established. The quasi-static analysis method is used to compare and analyze the influence of different curing conditions on the seismic performance of RC piers. The results show that the elastic modulus of C50 fine stone concrete is lower than that of cube compressive strength and axial compressive strength, but increases rapidly after 14 days of curing. The basic shape and development trend of the hysteresis curve of RC piers under different curing conditions are similar. The fullness of the hysteresis curve of the same curing temperature and humidity increases with the increase of age. When the curing temperature and humidity are the same, the yield load, ultimate load and ultimate displacement of RC piers increase with the increase of age, and the yield displacement decreases slightly with the increase of age. The curves of cumulative displacement ductility coefficient of RC bridge piers under different curing conditions are similar, and the maximum cumulative displacement ductility coefficient increases with the age when the curing temperature and humidity are the same. Before the horizontal displacement of RC pier top reaches yield displacement under different curing conditions, the change of viscous damping coefficient is small, and the viscous damping coefficient increases sharply after reaching yield displacement. When the curing time is the same, the difference in seismic performance of RC piers between standard curing and natural curing is small; when the curing temperature and humidity are the same, the seismic performance of RC piers at different ages varies greatly.
