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>>        .         .         .                 .        ,       .   ,                  . , , , ABSTRACT>>The shape of an inelastic demand spectrum may have a major impact on the seismic evaluation results of a structure. The inelastic demand spectrum could be obtained by scaling down from the elastic response spectrum by applying the strength reduction factor (SRF). This study has investigated formulas for SRFs that were suggested by numerous previous studies. This paper compares their characteristics, including the shapes of the curves of the SRFs and the inelastic demand spectra that were produced by applying the various formulas for SRFs. The mean curve was computed from the SRF curves generated by the various formulas. This study derives a new formula for the SRF curve through regression analysis. From the comparative study, it is shown that the proposed formula for the SRF can generate the mean curve of the inelastic demand spectra which have been previously suggested by others.Key words Inelastic Demand Spectrum, Seismic evaluation, Strength Reduction Factor, Mean Curve

Comparative Evaluation of Formulas of Strength Reduction Factors for the Generation of an Inelastic Demand Spectrum