振動数に依存する制振構造の等価周期・等価減衰の評価法とその精度 : 弾性架構と粘弾性ダンパーやオイルダンパーをもつ一質点構造における全体減衰系への置換法

Abstract

This paper discusses accuracy of a global damping model for approximate analysis of the structural system with either viscoelastic damper or oil damper. The model utilizes equivalent period and damping ratio of the system specifically determined at the resonant state, and, unlike the original system, it possesses neither frequency-dependency nor localized damping mechanism. By using different ground motion records, accurate time-history analyses are conducted using numerous one-mass systems with the dampers, and the results compared to those using their global damping models. With some modifications depending on the damper type, the global damping model is found to produce reasonably accurate results, thereby warranting its extended use for a conventional response spectrum analysis or simplified time history analysis.