A large number of continuous rigid frame bridges have been built in the high intensity area of the western of China,some of which are near active faults.In this paper,software Midas Civil is used to establish two continuous rigid frame bridge models with different pier heights and spans.Ten groups of near-fault ground motions are selected for elastic-plastic time history analysis.The influence of fault strike on seismic response of rigid frame bridges is mainly studied.The results show that under the horizontal bidirectional near-fault ground motions,when the angle between the strike of the fault and the longitudinal bridge are 75° to 125°,the seismic response of the main pier and the beam in longitudinal bridge of the rigid frame bridge is the largest,which may be underestimated by 20％without regard to the effect of the strike of the fault.The maximum transverse displacement of the bridge occurs between 0° to 30° or 150° to 180°.The above law is almost not influenced by different peak ground accelerations(PGA)and the bridge piers height and span.The study also found that if the influence of fault strike is not considered,there is a great possibility of misjudgment on the occurrence and location of plastic hinge zone of piers under near-fault ground motions.
维普
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