An Alternative Method For The Determination of Inelastic Displacements Using Pushover Analysis and Directly Generated Inelastic Spectra
نویسنده
چکیده
The present project aims to present an alternative method for the determination of the inelastic displacements using pushover analysis and directly generated inelastic spectra. The determination of the target displacement is similar to Fajfar`s N2 method, employed in Eurocode 8. Unlike the EC8, where empirical formulas are used for describing the inelastic seismic demand, the proposed method uses directly generated constant-ductility inelastic response spectra, trying to reproduce actual nonlinear structural response by means of a chosen hysteretic representation of the system. Using the inelastic response history of Single Degree of Freedom (SDOF) systems makes possible to eliminate uncertainties regarding the determination of the inelastic spectra. The proposed method represents an alternative for nonlinear time-history analysis by using a specific demand, in terms of recorded earthquake ground motion. In the case of elastic design spectra compatible with a specific accelerogram, the results are comparable to those obtained by nonlinear pushover analysis. In order to avoid errors, both pushover analysis and incremental dynamic analysis were conducted with the same software package, on the same computational model.
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