Abstract: The deterioration of concrete durability can be reflected in the degeneration of material properties, which will inevitably lead to the reduction of seismic performance of bridge structures. This paper takes 3-span reinforced concrete beam bridge as the research object to formulate ANSYS full bridge model, considering the influence of freeze-thaw and chloride ion environmental factors, then the non-linear time history analysis under uniform excitation of seismic loads is carried out. In the whole service period, the seismic response of bridge structures in different time periods is calculated according to the different degree of material deterioration in different service periods, and the stress and displacement in each period are compared and analyzed. The results show that, the seismic performance of the structure decreases significantly with the deterioration of materials, to which should be paid enough attention in the process of design and management.

Key words: material deterioration, bridge seismic, time history analysis