Scaling of Earthquake Accelerograms for Non-Linear Dynamic Analyses to Match The Earthquake Design Spectra

Abstract eng:
A complete seismic design of structures requires linear and nonlinear time-history analyses especially for special type buildings. Seismic design codes generally define ground shaking in the form of a response spectrum of acceleration and allow using response spectrum compatible time history records in linear and nonlinear time history analyses. These records can be obtained from natural earthquake records, or can be generated synthetically and artificially. Although using real earthquake records has many advantages, there may exist lack of strong motion earthquake records to satisfy seismological and geological conditions and requirements defined in seismic codes. Artificial accelerograms whose response spectra closely compatible to design response spectra can be generated in either time or frequency domain. Matching techniques are based on scaling of the selected time history in time domain; filtering actual motion in frequency domain by its spectral ratio with the design target spectrum; or elementary wavelets are added or subtracted from the real time history to match a target design spectrum. In this study, the spectrum matching procedures for real accelerograms are summarized and applied to selected real acceleration records to match the proposed Type 1 elastic design spectrum given in the Eurocode 8 for specified seismic region and soil type. Artificial accelerograms, which are compatible with the selected design spectrum, are generated according to specified scenario earthquake. The linear and nonlinear response of single degree of freedom system subjected to the modified and artificially generated time histories acceleration records are compared and the advantages and disadvantages of each one are discussed.

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