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The effect of stiffness or strength degradation, or both, under cyclic loading on the seismic response of single‐degree‐of‐freedom inelastic systems with 5% initial damping is investigated. Rules are proposed to construct inelastic design spectra for these systems (typical of reinforced concrete construction) as a function of the desired displacement (or ductility) ratio. These rules complement those used at present based on the response of simple elasto‐plastic systems without any degradation.
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Al-Sulaimani et al. (1985) studied this question.
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