構造物基礎-地盤系における減衰の非線形性に関する実験的研究

Abstract

In this study, proposed are the two methods of classifying the dynamic resistant force ofthe structural foundation and surface layer system into hysteretic restoring force related tothe response displacement and damping force related to the response velocity.The experimental results are investigated through the two methods to find that the rela-tion between the velocity and the damping force is nonlinear; I.e., the rate of increase inthe damping force decreases for increasing velocity. The degree of the nonlinearity becomesremarkable when the excitation frequency is lower than the natural frequency of the sur -face layer. This tendency can be reasonably explained from the energy dissipation due topropagation waves away from the structure.