RELATIONSHIP BETWEEN DAMAGE RATIO OF EXPRESSWAY EMBANKMENT AND SEISMIC INTENSITY BASED ON THE ACTUAL DAMAGE DATA IN THE MID-NIIGATA EARTHQUAKE

Abstract

Many major and minor damages were found in the 2004 mid-Niigata earthquake, especially for the embankments of the Kan'etsu expressway and the Hokuriku expressway. Using both the actual damage data and detailed spatial distribution of seismic intensity, this study conducts the statistical analysis on the relationship between the damage ratio of expressway embankment and seismic intensity to construct fragility curves. Based on the obtained results, major damages that affect the serviceability for traffic are found in the area where the JMA seismic intensity is larger than about 5.1.