A STUDY ON DISPLACEMENT RATIO SPECTRA OF CONSTANT YIELDING STRENGTHFOR SEISMIC DESIGN

摘要

A through study on the inelastic response spectra can provide significant clues to the seismic design ofstructures, in particular, when the strong earthquake ground motions drive structures entering its inelasticdeformation stage. In this paper, the response spectra of 544 strong-motion records with engineeringsignificance were calculated and a statistical analysis of their inelastic response spectra revealed that thesite conditions, intensity of ground motions, yielding strength level and period of structures will giveimportant effects on the inelastic spectra. Finally, an new experimental expression of the inelastic spectrain terms of period, yielding strength and inelastic displacement ratio which permits the estimation ofmaximum inelastic displacement demands on a structure from maximum elastic displacement demands,was obtained and has been recommended to adopt in seismic design code.