Recovery of spectral absolute acceleration and spectral relative velocity from their pseudo-spectral counterparts

George A. Papagiannopoulos , George D. Hatzigeorgiou , Dimitri E. Beskos

Abstract

Design spectra for damping ratios higher than 5% have several important applications in the design of earthquake-resistant structures. These highly damped spectra are usually derived from a 5%-damped reference pseudo-acceleration spectrum by using a damping modification factor. In cases of high damping, the absolute acceleration and the relative velocity spectra instead of the pseudo-acceleration and the pseudo-velocity spectra should be used. This paper elaborates on the recovery of spectral absolute acceleration and spectral relative velocity from their pseudo- spectral counterparts. This is accomplished with the aid of correction factors obtained through extensive parametric studies, which come out to be functions of period and damping ratio.

Key Words

absolute acceleration; relative velocity; pseudo-spectral values; damping modification factor;correction factors; seismic motions

Address

George A. Papagiannopoulos — Department of Civil Engineering, University of Patras, GR-26500 Patras, Greece
George D. Hatzigeorgiou — Department of Environmental Engineering, Democritus University of Thrace, GR-67100 Xanthi, Greece
Dimitri E. Beskos — Department of Civil Engineering, University of Patras, GR-26500 Patras, Greece; Office of Theoretical and Applied Mechanics, Academy of Athens, 4 Soranou Efessiou str.,GR-11527 Athens, Greece GR-11527 Athens, Greece

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