EFFECT OF WELL- KNOWN CHARACTERISTICS OF NEAR FAULT GROUND MOTION ON SEISMIC RESPONSE OF BRIDGES

Ground motion records from recent earthquakes have shown that near-fault records are different from far-fault ground motions. Failures of modern engineering bridges, observed within the near-fault region in recent earthquakes, such as 1999 chi-chi, revealed the vulnerability of existing bridges against pulse-type ground motions. Although current seismic design criteria consider this damaging effects by amplifying the design spectra, this methods do not adequately represent consequence of well-known characteristics of near-fault ground motion on seismic response of bridges.

کلیدواژه ها:

simple pulse ، near-fault ، forward directivity ، filing step ، bridge ، ground motions