Current specification prescribes that upper and lower reinforcement mat is required in the same amount to resist negative and positive moment in bridge decks. But the negative moment is much smaller than positive moment because the actual behavior of ...
Current specification prescribes that upper and lower reinforcement mat is required in the same amount to resist negative and positive moment in bridge decks. But the negative moment is much smaller than positive moment because the actual behavior of deck consists of local deflection of slab and differential deflection of girder. From this study, the simplified analysis method based on force method and slope-deflection method was developed and verified by finite element programs. The negative moment obtained from this method is smaller than KHBDC's by 40~50% in the middle of bridge, and is affected by variable parameters as shape factor(S/L) of slab, relative stiffness ratio, and so on. This investigations indicate that the upper reinforcement mat to resist negative moment can be removed and further experimental study is required to consider durability and serviceability. From this new design concept, the construction expense can be reduced and the problem of decreasing durability resulting from corrosion of upper reinforcement steel settled.