Estimation of maximum response ductility using equivalent natural period and damping ratio obtained from acceleration response of a nonlinear SDOF system with bilinear hysteresis during earthquakes

Aiko FURUKAWA, Akira IGARASHI, Junji KIYONO
2011 Journal of Japan Society of Civil Engineers Ser A2 (Applied Mechanics (AM))  
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 frequency
more » ... d frequency domains, respectively, and different estimation equations are derived for each domain. The validity of the proposed equations is confirmed through the numerical simulations. It is found that the equations derived in the frequency domain have higher accuracy if extracted acceleration records with impulsive response are used. It is also found that the equations derived in the time domain give bad accuracy when the displacement response is nonsymmetric or acceleration records contain measurement noise.
doi:10.2208/jscejam.67.i_801 fatcat:bllxoi7d4fhexcrjrvozt3d2mi