ANALYSIS OF SPECTRAL CHARACTERISTICS AND INTENSITY INDICES FOR NEAR-FAULT GROUND MOTIONS

The characteristics of elastic response spectra and hysteretic energy spectra for two kinds of near-fault ground motions were analyzied whose results were compared with the ones for general ground motions． It was concluded that the effects of the said two motions on the acceleration response，dynamic response， velocity response， displacement response and hysteretic energy influence of medium-to-long period structures were all greater than those of general ground motions． And the displacement response for fling-step-type ground motions is significantly greater than the forward directivity ground motions． Finally，a correlation analysis of 20 intensity indices for two kinds of nearfault ground motions were separately conducted． It was recognized that the peak ground acceleration( PGA) index was advised to analyze short-period structures， and the peak ground velocity( PGV) index was advised to analyze mediumto- long period structures．