Abstract
Based on the damage data of 819 bridges except the damage caused by tsunami among 960 bridges due to the 2011 off the Pacific coast of Tohoku Earthquake, the analysis in this report was carried out to make clear the relationship between the damage features and the structural characteristics, and the intensity of earthquake ground motion. The records obtained at 517 points observed in 6 prefectures in Tohoku region with the surrounding 4 prefectures of Niigata Prefecture, Gumma Prefecture, Tochigi Prefecture and Ibaraki Prefecture were used to estimate the intensity of earthquake ground motion such as the peak ground acceleration (PGA) and the peak ground velocity PGV by Spline interpolation method.
As a number according to the damaged element of bridge, most damaged element is level differences behind abutments. Subsequently, there is much collapse of shoe. Moreover, damage about failure of a bridge pier or abutments is few. The damage behind abutments has few differences according to bridge type. Failure of shoe has occurred in a steel bridge mostly.It is found that the damage probability of level difference behind abutments becomes more than 30% around 30 cm/s of PGV, and that the damage of shoe has the high correlation with the component of velocity of an earthquake ground motion, but that it also has relationship with acceleration.
