減衰量の高さ方向分布に不均等性を有する均等フレームの振動特性 : 等価モード減衰定数と減衰消費エネルギー

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This paper describes the vibration characteristics of bending-shear type uniform frames to having of inhomogeneity for damping quantity along the heights. It is installed viscous damper in arbitrary story so that the analytical structure has inhomogeneity for damping quantity. Based on the strain energy theory, two methods are carried out to evaluate the equivalent modal damping factors. One method is using classical normal modes, the other is using complex modes. It is analytically explained that the equivalent modal damping factors for these structures could be accurately calculated by using classical normal modes, at the installed damper coefficient less than 15% concerning the first mode. Through the seismic response studies, the energy absorbing is divided into each mode. It is discussed the relationship between equivalent modal damping factors and the effectiveness of the overall responses reductions.
1998-11-30