ESTIMATION OF THE GROUND CHARACTERISTICS IN ONAGAWA TOWN DURING THE 2011 TOHOKU EARTHQUAKE AND TSUNAMI CONSIDERING THE DAMAGE OF THE PILE-SUPPORTED RC BUILDING

Abstract

 Pile-supported RC buildings were pulled up and toppled by the 2011 Off the Pacific Coast of Tohoku Earthquake Tsunami. There were some buildings around the target building and the ground was soft, so the complex tsunami flow between buildings and the soil condition influenced by the earthquake and the tsunami have to be considered to found out the damage mechanism. In this study, we find out the soil condition at that time with FEM analysis using tsunami horizontal force getting by three dimensional tsunami analysis. As a result, it was shown that liquefaction was occurred under the building when the biggest tsunami horizontal force act upon the building and piles were broken. It was also shown that at that time the tsunami made the rigidity of the surface soil higher than that of dipper area.