Abstract
If railway bridges suffer damages by earthquakes, appropriate train control and repair work according to damage levels have to be determined. In this study, a new method to evaluate the damage levels of RC rigid frame bridges is suggested. The decrease in stiffness of the bridge under damages and decrease in the natural frequency with increase in response ductility factor were grasped using the reversal cyclic loading test for half-scale model of the standard type rigid frame bridges of the Tokaido Shinkansen. As a result, it was found possible to evaluate the damage level of bridges by measuring their natural frequency using the dynamic percussion test. And a new rational method to evaluate the damage levels from decrease rate in stiffness of bridges obtained through frequency analysis and response ductility factor calculated by push over analysis of structural members is proposed. These proposed methods were erified through the site tests of the real railway bridge planned to be removed.
