| Abstract: | A new rule is presented to estimate strength-reduction factors in single-degree-of-freedom elastoplastic oscillators, in which reduction factors depend only on displacement elastic spectra, so they are not an explicit function of structural period. It is found that the proposed rule yields good results when applied to accelerograms recorded in firm and soft soils, and for damping ratios of 2, 5 and 10 per cent of the critical. It is shown that the proposed reduction rule is more general than others previously published, and at least as accurate. © 1998 John Wiley & Sons, Ltd. |
