Stability Analysis Of Prestressed Concrete Continuous Rigid Frame Bridge With Tall Pier And Large Span

Based on one prestressed concrete rigid frame curved bridge with tall pier and large span,builds up a integrated and elaborate curved bridge and corresponding straight bridge finite element model with MIDAS/CIVIL,a large-scale FEM software ,to discuss and analyze the stability in construction stages and service stage.The thesis respectively calculates and analyzes the stability in construction stages and service stage of curved bridge and corresponding straight bridge:â‘ the stability of the highest pier under loads of self weight,longitudinal wind load,transverse wind load in construction stages;â‘¡the stability of the longest double cantilever structure during the cantilever cast-place construction under loads of self weight,longitudinal wind load,transverse wind load,vertical wind load and error of dead load in construction stages;â‘¢the stability of the continuous grid frame bridge completing and in useing under loads of self weight,vertical load on the top of the pier produced by upside dead load and live load combination,longitudinal wind load,brake load on the top of the pier produced by moving load in service stage. Educed that the stability factor of curved bridge all less than corresponding straight bridge in every stage. Especially the stability factor is minimum when traveller droped in the longest double cantilever structure during the highest pier cantilever cast-place construction,therefore,we must be on the alert and ensure the safety of traveler during construction.The thesis also discusses the stability by add two lateral contacts when the highest pier's longest double cantilever structure about curved bridge.Therefore, the stability and computing method of prestressed concrete continuous grid frame bridge are comprehensively understood.