Abstract
The nomograph of seismic damage estimation has been proposed for a general railway bridge, whose damping is depending on its natural period. Therefore, it might not be applied to the structures with various damping characters. Then, the new nomograph estimating a seismic damage of structures with various damping was proposed. This method evaluates a response ductility simply by using PGA, PGV, the natural period of structure, yield seismic intensity, and damping. It was checked that the variation coefficient of the fragility curve given by the proposed method is smaller than that estimated only by using a single parameter of the earthquake motion. Consequently, the proposed nomograph estimates the damage of the structures having arbitrary damping and natural period, considering resonant motion due to an earthquake.
