Abstract
To increase the load-capacity of the existing plate girder bridge, there are two ways of strengthening method, by using cover plate and by using prestressed external tendon. As for these methods, the strengthened effect to load-capacity has been confirmed. However the endurance effect has not been confirmed. Especially, the dynamic behavior due to moving vehicle of the member with secondary stress that fails under fatigue is not clearly understood. Comparing of experiment and analytical primary and secondary stress due to moving vehicles in the existing plate girder bridge strengthened by prestressed external tendon confirmed the validity of this study. Moreover, this study evaluated strengthening effect of endurance due to fatigue failures using analytical results.
