Abstract
Spillway is an important facility whose function is discharge. Spillway is an complex structures which is composed of various materials and structural parts. So, in order to make an accurate evaluation of seismic safety of spillway, it is necessary to analyze the complex earthquake behaviors. In this study, I made 3-D reproduction analyses for actual earthquake behaviors of existing spillway, and made clear the mechanism of earthquake damage of spillway. And, I made comparative study on the earthquake countermeasuresms by 3-D dynamic analyses. As a result, it is concluded that the relative displacement between piers is main cause of earthquake damages and the countermeasures by connecting piers with the reinforcement is effective to reduce the relative displacement.
