Effect to Reduction of Section Forces by Seisimic Retrofitting Methods for Rectungler Underground Structure

Abstract

The effect of a seismic retrofitting method for rectangle underground structures is examined by analytical method. Seismic isolation material, expanded poly-styrol (EPS), and soil improvement are focused as seismic retrofitting methods. Effects of these material are studied in some ground conditions, in soft ground, hard ground, and soft ground contact with based rock just below the bottom slab. By studying each seismic isolation method in same condition, the applicability and character of them are made clear. The position of retrofitting materials and its property are changed widely in analysis for the future material development. Finally, the effect of some combination of retrofitting methods is also examined.