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In this study, estimation equations of maximum response ductility from the acceleration response of a nonlinear SDOF system during an earthquake are proposed. It is assumed that the model has a bilinear skelton curve and is subject to Masing's law. The estimation equations are the function of the equivalent natural period and damping ratio on the assumption that the nonlinear system is approximated with an equivalent linear model. The approximation is conducted in the time and frequencydoi:10.2208/jscejam.67.i_801 fatcat:bllxoi7d4fhexcrjrvozt3d2mi