DAMAGE OF WATER TANKS AND ITS RELATIONSHIP WITH STRONG GROUND MOTION IN KUMAMOTO AREA DURING THE 2016 KUMAMOTO EARTHQUAKE

Abstract

 The authors investigated the damage of water tanks, elevated tanks and distributing reservoirs in Kumamoto Prefecture during the 2016 Kumamoto Earthquake and clarified the characteristics of the damage from the viewpoint of sloshing and bulging. Through the comparison between the locations of the damaged tanks and the contour maps of the response spectra, obtained from a lot of strong ground motion records, we found that there is a good correspondence between them and that the damage of sloshing and bulging can be verified due to the appearance of short- and long-period earthquake response which exceeds the maximum design values in the present seismic design regulations.