Abstract
Recently, receiving combined actions due to chloride induced deterioration by spraying deicing salt and fatigue by live load, RC road bridge decks in cold regions are suffering from serious damages. Therefore, this study aimed at investigating the influence of corrosion of rebars on fatigue resistance in RC road bridge deck, experimentally and analytically. First of all, specimens supposing full-sized RC road bridge deck were prepared and 3 types of accelerating tests for chloride induced deterioration were conducted. Then the relationship between corrosion condition of rebars in each specimen and its fatigue resistance was investigated by wheel load trucking test. Secondly, the influence of fatigue fracture in RC road bridge decks on the difference in quantity of corrosion between upper rebars and lower rebars was researched by 3-D nonlinear finite element analysis. These experimental and analytical results revealed that the fatigue resistance of RC bridge deck was clearly declined even if the corrosion rate of rebar was approximately 5%, and the corrosion of upper rebars would be the dominant factor in the fatigue resistance of RC bridge deck rather than that of lower rebars.
