Seismic Response Analysis Of Flexible Pier Beam Bridge

The thesis was an ingredient of the Shaanxi Provincial Science and Technology Researchand Development Scheme project. Through a large number of survey data show that afterWenchuan earthquake,the most seismic damage of the beam bridge include：Along thelongitudinal bridge the extendable device damage, the concrete beam end cracking orcrushing and the main beam landing caused by excessive movement of the beam；Along thetransverse the stop destruction, the main beam’s large displacement cause transverse landingbeam;the abutment slip off the main beam, pier bending shear destruction.This shows,tooweak bridge connecting can cause serious damage bridge，Therefore，analyse the bridge’sseismic response，especially considering friction effect of laminated rubber bearing and potrubber bearing, Identify the rule of the seismic response along the longitudinal andbridge,give suggestions about designe for this type of bridge.This paper took the simply supported girder bridge and continuous girder bridge asengineering background，through a lot of calculation and analysis show that: simple supportedBeam Bridge along the longitudinal direction of the bridge, bridge abutment and beam, beamand beam of easy collision, collision force large. Along the bridge lateral, pier stiffness larger,block and beam easy to collide, the collision force is large, the pier bottom bending momentand shear force is greater. By comparison, the pier end of transverse shear and bendingmoment was significantly greater than the longitudinal. For the continuous beam bridge, thelongitudinal earthquake response affected by the span of number is small, number of spanincreases, bending moment and shear force of the fixed pier increases a little, however, thepier stiffness greater, the fixed pier force greater; transverse earthquake response affected bythe number of span is large, with the increase of span number, the bottom of the pier momentand shear force rapid increase, so the continuous beam bridge span number more, pier columnlateral force more unfavorable, and the abutment transverse fixed support bear greathorizontal force.According to the law of the analysis results of the earthquake response of bridges, for thistype of bridge design gives some suggestions: For simply supported beam bridge, thelongitudinal direction of the bridge should take buffer measures to reduce the huge impactforce between the abutment and beams, taking into account the bad effects of the impact forceon the abutments; Laterally along the bridge, the force of abutments stopper and piers stopperare different, for higher levels of aseismatic, bridge should be designed separately. Forcontinuous girder bridge, abutment at the bearing anchor should be strengthened to ensure that under earthquake anchor is not destroyed; for multi-span (5span,6span) and larger pierstiffness bridge, should be set tie beam at the pier top, reducing the lateral force at the fixedbearing piers to avoid premature destruction. For larger pier stiffness simply supported beambridge and multi-span continuous girder bridge, it is recommended to take a rectangular piers,vertical and horizontal force would be more reasonable, the material can be fully utilized.