EFFECT OF PREVENTIVE MAINTENANCE ON BRIDGE EXPANSION JOINTS AGAINST CORROSION AT STEEL GIRDER END PARTS

Abstract

 A bridge is a composite structural system consisting of various members hierarchically. Therefore, to determine the timing of inspection and repair, it is necessary to consider the relationship between members in which the deterioration of one member can affect the deterioration process of another member. In this study, the authors focus on the corrosion process at the end of steel girders caused by water leakage from the expansion joint. Specifically, two state modes are defined according to the state of water leakage from the expansion joint, and the corrosion process of the end of steel girders is expressed as a regime switching Markov deterioration hazard model with hazard functions set to each state mode. The model is estimated using actual inspection data to verify the difference in the rate of corrosion propagation of the ends of steel girders depending on the state mode of water leakage of the expansion joints, and the effect of preventive maintenance of the water-stopping device is analyzed to restrain the corrosion of the ends of steel girders and to reduce the life cycle cost of the entire bridge.