Abstract
RC deck slabs were cut out from highway bridges as the specimens, and various investigations and tests were conducted to clarify the conditions of construction, actual state of damages and remaining fatigue life of those slabs. The following results were obtained. (1) The state of damages can be rated by parameters such as crack density, deflection and static loading capacity of the slab. (2) The actual bridge deck slabs have 20 to 30 percent less static loading capacity compared to newly constructed slab specimens. (3) Remaining fatigue life of the actual bridge deck slabs is shorter than the estimated life from the existing S-N curves. Finally, correction of the S-N curve for the actual slab was proposed considering equivalent repeated numbers, the effect of drying shrinkage and the effect of water. (4) The present rating criteria for damaged RC slabs by JH was proved to be reasonable through those experiments.
