Development of Building Fragility Curves Based on Mashiki Town's Disaster-Victim Certificate Data due the 2016 Kumamoto Earthquake

Abstract

This study investigates the building damage in Mashiki Town based on damage survey data of the local government due to the 2016 Kumamoto, Japan, earthquake. The damage ratios of buildings were investigated from the viewpoints of structural material, construction period, roof types and the number of floors. Moreover, the heavy damage ratios of wooden buildings were compared with those from the 1995 Kobe earthquake and the 2007 Niigata-ken Chuetsu-Oki earthquake. As the result, the major damage ratio of wooden houses was found to be much larger than those of other structural materials (RC, steel and light-gauge steel), and it got higher as the construction period becomes older. The results were further compared with the estimated distributions of the peak ground velocity (PGV) and the Instrumental JMA seismic intensity and the fragility curves for different structural materials (wood, S, and LS) and those for wooden buildings for five construction periods were developed.