構造物-杭-地盤連成系への地震エネルギー入力

抄録

A new frequency-domain method is developed for evaluating the earthquake input energy to a structure-pile-soil system or a super-structure alone subjected to a horizontal ground motion at an outcropping engineering bedrock surface. It is shown that the formulation of the earthquake input energy in the frequency domain is essential for including the frequency-dependent vibration property of the surface ground in terms of the wave propagation theory and the frequency-dependent property of the dynamic Winkler-type spring of the soi l around piles. It is also demonstrated that (l)the present formulation is effective for various input levels and various ground nronerties and (2)the energy input mechanism in the building structure-pile-soil system can be well described by the newly introduced energy transfer function (F-function).