Abstract
In this paper, the effect of pre-loading to structural mechanism of RC composite beam is discussed. We carried out flectural tests on RC composite beam which was built by adding reinforcement and concrete to the pre-loaded beam. The results show that the crack width of RC composite beam can be estimated adequetely using the amount of stress of reinforcing bar subjected to pre-loading. It is also found that the effect of the direction and the amount of pre-loading to the ultimate moment of RC composite beam is negligible.
