By choosing spectral acceleration as Intensity Magnitude parameter and bending moment at pier bottom as Engineering Demand Parameter, Probabilistic Seismic Demand Analyses for seismic isolated simply supported beam bridge with Lead Rubber Bearing (LRB) and non-isolated bridge are presented in this paper, from which the function of LRB is studied with a quantitative analysis method of the probability based. The results of Probabilistic Seismic Demand Model show that the regression slope of isolated bridge is smaller than that of non-isolated bridge. It means bridge installed with LRB is less sensitive to the increase of ground motion intensity. The results of Probabilistic Seismic Hazard Analysis show that the exceeding probability of isolated bridge for encountering a certain spectral acceleration is lower than that of non-isolated bridge, so the using of LRB decreases the bridge’s hazard level. The results of Probabilistic Seismic Demand Hazard Analysis indicate that the LRB can greatly decrease bridge's annual exceeding probability for reaching yield moment at pier bottom with the setting site condition and structure parameters in this paper. The research carried out in this paper shows that Probabilistic Seismic Demand Analysis, as a probability based quantitative analysis method, can be adopted in evaluation of different seismic design methods or seismic devices.
LI Sheng;ZHONG Tieyi;ZHANG Changyong.
Study on Seismic Performance of LRB Based on Probabilistic Seismic Demand Analysis[J]. Journal of Vibration and Shock, 2013, 32(7): 48-53
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