Effect of ground motion duration on the seismic performance of the frame piers of a double-deck viaduct
The effect of ground motion duration on the seismic performance of a double-deck viaduct's frame piers was studied.Based on the quasi-static test of double-deck frame piers,a numerical model was built with OpenSees.The simulation results were in good agreement with the test results.Two sets of ground motion records with long-duration and short-duration were selected,and the relationship between the peak ground acceleration(PGA)and displacement duc-tility ratio was established through incremental dynamic analysis.In addition,the fragility curves were obtained.The median values of PGA are 0.35g,0.55g,0.78g,and 0.98g under long-duration ground motion and 0.35g,0.59g,0.91g,and 1.20g under short-duration ground motion.As the degree of damage increases,the difference interval between the fragility curves of the double-deck frame piers increases with PGA.Under a nine-degree rare earthquake(0.40g),the probabilities of serious damage and complete destruction of the double-deck frame piers,respectively,are 25.57％and 8.61％(long-duration ground motions)and 16.98％and 4.79％(short-duration ground motions).This result indicates that the double-deck frame piers are more likely to suffer damage under long-duration ground motions with large PGA.
万方数据
维普
