Seismic Response Analysis on Continuous Beam One-way Slope Bridge with High and Low Pier in Mountainous Regions

摘要

The internal forces at the end of pier, anti-push stiffness at the pier top, and seismic forces distribution law of one-way slope bridge with high and low pier, continuous beam and ordinary laminated rubber or lead-rubber bearing in mountains were analyzed by inputting EL-centro earthquake wave into 21 kinds of working conditions which were built on 3 kinds of boundary conditions and 7 kinds of piers with different height by adopting finite element analysis method. The results show that under the axial + vertical seismic action and transverse + vertical seismic action, the high pier with larger and smaller stiffness will respectively withstand major seismic loads, and with the increase of pier height, the seismic force gap between low and high piers is also increasingly larger; the earthquake forces of the pier bottoms along both directions can be reduced if the LRB is adopted, but the seismic isolation effect will gradually decrease until loses when the pier height raises to a certain value; the shock absorption effect is not obvious for the high pier with less stiffness of LRB and is obvious for the low pier with larger stiffness.