Abstract

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Title:: Influence of Chloride Ion Corrosion on Seismic Performance of Reinforced Concrete Piers

Author(s):: LI Li-feng; LIU Shou-miao; WU Wen-peng; School of Civil Engineering, Hunan University

Keywords:: bridge engineering; chloride ion corrosion; seismic performance; material deterioration; reinforced concrete pier

Abstract:: In order to study the deterioration law of seismic performance for concrete bridges which was caused by chloride ion corrosion on steel and concrete during the bridge’s service life, a multi-span reinforced concrete (RC) continuous girder bridge was taken as an example. The nonlinear dynamic analysis model was established by OpenSees software. Based on the previous researches, the probabilistic analysis method was applied to investigate the initial corrosion time and corrosion rate of the main reinforcement of pier column section and stirrup. Then the deterioration models of the diameter and yield strength of steel were established. Three typical analysis cases, consisting of longitudinal reinforcement corrosion, stirrup corrosion and the combination corrosion of longitudinal reinforcement and stirrup, were investigated to study the effects of material deterioration on the seismic performance of RC piers. The results show that the initial corrosion time of stirrups is earlier than that of longitudinal reinforcements under the same conditions. The chloride ion corrosion effect can cause the deterioration of seismic capacity for the RC piers as time goes on, and the seismic demands will increase obviously. Compared with only considering the corrosion situation of longitudinal reinforcement in the past, the deterioration of seismic performance is more serious when the stirrups and longitudinal reinforcement corrosion are both considered.