PROPOSAL OF DESIGN FORMULA TO CONSIDER THE REDUCTION IN SEISMIC LOAD DUE TO SOIL-STRUCTURE INTERACTION

-Evaluation of the effect of soil-structure interaction based acceleration response-

Abstract

The following are emphasized for the purpose of evaluating the reduction ratio by soil-structure interaction for design : 1) Proposing design formula of the effect of inertia and kinematic interaction based acceleration response with the idea of soil amplification function. 2) Expressing an extension of natural period and increasing of damping of a soil-structure system with variables of impedance and calculating an explicit relation between a changing of vibration characteristics and influential factors of soil-structure interaction. 3) Visualizing the effect by finding energy balance-based prediction equation of ratio of acceleration response. The proposed design formula can be useful in evaluating the effect on the seismic design load due to soil-structure interaction.