Abstract
Crack width on the surfaces of concrete girders is increased by partial drying shrinkage near the surfaces after initial cracking. And, reinforcement stress, that is the main factor of bending crack width, is varied by the influence of drying shrinkage and creep. We examined the practical method of the estimation of reinforcement stress in disregard of concrete tensile stress, and the partial dying shrinkage near the surfaces through the results of experiments by RC beams under drying circumstances, and of measurements of crack width, spacing and reinforcement stress on real concrete girders. This paper reports the practical method of calculation of the bending crack width on the surfaces of concrete girders.
