非分散性減衰モデルの動力学(続)

概要

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Use of the RS value instead of the conventional peak value for the single-parameter intensity measure of time histories provides remarkable ease of calculus operations. During a preliminary phase in the current report emphasized is the advantageous role of "RS response spectra" in this regard, with primary references to the violation of pseudo response spectrum relations and the influence of damping. Long-period spectral content of earthquake ground motions is shown to be well reasonably modeled in this type of formulations. Then the discussions enter into the seismic performance of systems characterized by non-dispersive damping properties, the related dynamics of which was examined comprehensively in the preceding report motivated by the Iwan's drift demand spectra. Their response is extraordinarily featured by an explicit participation of ground velocity and displacement, however, with no specific mathematical difficulties posed as compared to the elementary Voigt problem. In the 1-dof instances, singularities are most evidently identified when described along the axis of increasingly larger damping. Also an analytical representation is given toward the RS version of the Iwan spectra for the base deflection angle of erected uniform shear-beam cantilevers, which leads then to clarification of its difference arising between the ordinary spectra.
一般社団法人日本建築学会の論文
2008-03-25