SPECTRUM-COMPATIBLE ACCELEROGRAMS FOR INELASTIC SEISMIC ANALYSIS OF SHORT-PERIOD STRUCTURES LOCATED IN EASTERN CANADA

Smooth design spectra are generally used to describe the seismic excit ation provided by the maximum design earthquake for safety evaluation of critical facilities located in eastern Canada. However, a comprehen sive study of the inelastic behaviour of critical structural systems r equires a step-by-step inelastic analysis in the time domain. This pap er presents a study of the inelastic seismic analysis of short-period structures subjected to ground motion acceleration time histories comp atible with eastern Canadian conditions and defined (i) from historica l records scaled to the smooth design spectrum intensity, (ii) from sp ectrum-compatible accelerograms generated by random vibration theory, and (iii) from the modification of the Fourier spectrum coefficients o f historical records while preserving the original phase angles. The d uctility demand, the input energy, the hysteretic energy, the number o f yield events, and other performance indices are examined in parametr ic analyses to identify the type of earthquake motions that is critica l for earthquake resistant design of short-period structures.