粘性減衰により吸収されるエネルギー及び多層地盤のエネルギー分配率の評価エネルギーの釣合に基づく地盤の地震時挙動の評価に関する研究　その2

摘要

The main purpose of this study is to form an evaluation method of the ground motion caused by an earthquake on the basis of the energy balance concept through pseudo dynamic tests. In this paper, the following two feds are made clearly stated in order to form the evaluation method: 1) The ratio between the viscous damping energy and the energy input can be evaluated by the previous equation proposed for frame structures using the viscous damping ratio. 2) The energy distribution of each layer is stabilized after the shear strain reaches the reference strain. The energy distribution ratio can be evaluated using the following three items: A) the initial effective confining stress, B) the damage level which is obtained by the first mode of the ground stratum and displacement response spectrum, C) the reference strain tot shows the ductility of the ground material.%著者らは地震時の地盤の損傷程度(過剰間隙水圧の発生による有効応力の減少や地盤の軟化,地盤変形量)を簡易に評価するため,上部構造におけるエネルギーの釣合に基づく耐震設計法1)を地盤分野に展開した,合理的な地盤の地震時挙動の評価法の構築を目指している2).