OBSERVATION AND ANALYSIS OF DYNAMIC SOIL-STRUCTURE INTERACTION EFFECT ON BASE ISOLATED BUILDING WITH GRID-FORM GROUND IMPROVEMENT

Abstract

Recently, the grid-form ground improvement against liquefaction got to be used for buildings. We have many earthquake observation records including the 2011 off the Pacific coast of Tohoku Earthquake at a base-isolated building with the ground improvement. In this paper, we studied the dynamic soil-structure interaction of the building. First, the records concerning the soil-structure interaction were analyzed. Then, the earthquake response analysis was conducted to simulate the observed record using a detailed three dimensional FEM model. In the analysis, the input loss effect was confirmed. Moreover, the contribution of the grid-form ground improvement to the effect was estimated.