The Analysis Of Stability Against Overturning Of Curved Girder Bridges With Single-column Pier

In recent years,as the increasingly development of transportation and urbanization,single column pier continuous curved bridges have been widely used in highway interchanges and overpass bridges.Because of the characteristics of single column continuous curved structure itself,the internal and external sides of abutment anti force distribution may not be uniform.It is easy to cause the emergence of bearing disjoint phenomenon,even happened overturning failure accident.Bridge engineering as the livelihood projects,structure overturning failure is directly related to people's life and property safety,so it is necessary to deeply study on the performance of anti overturning of single column curved girder bridges.In this paper,based on the analysis theory of curved bridge,the finite element models of single column curved girder bridges using beam-girder method with same span different curve radius and the same curve radius different span have been set up.And adjust double bearings space at the end region of beam and the offset distance of bearing placed on the single-column pier.Based on such models,analysed the variation law of internal bearing force under constant loads,and researched the value of reasonable bearing eccentricity.The main factors which influence the resistive overturning stability of curved beam bridge had been concluded.Using single beam method and entity unit method added further calculation for stability against overturning coefficient of curved girder bridge.At the same time,studied the maximum load of the typical overload vehicles cross bridges in traffic flow.The main contents are as following.Firstly,Analysis the variation of end beam internal bearing force under constant loads,larger curvature radius and more number of span and larger space between double bearings and larger offset distance of single bearing of curved girder bridge have smaller difference value of inside and outside bearing reaction force at the beam end,stress is relatively uniform.Secondly,Study reasonable bearing eccentricity calculation methods,that more number of span and larger radius of curved girder bridge,the bearing eccentricity is sensitive,need relatively smaller bearing eccentricity;Less number of span and smaller radius of the curved girder bridge,is not sensitive to eccentric bearing,require relatively larger bearing eccentricity.Thirdly,the bearing negative force variation law of the inside and outside at beam end under the highway-?level live load had been analysed.The support negative reaction decreased with the increase of radius of curvature and number of span and space between two bearings and offset distance of single bearing.Fourthly,Study the influence of different parameters on the curved girder bridge stability against overturning coefficient,relatively,resistance to capsizing of more number of span and larger radius of curvature of the curved girder bridge is stronger than less number of span and smaller radius of curvature;Increasing the double bearing spacing at beam end can enhance the overturning resistance of the curved girder bridge,and increase the single column pier single bearing eccentricity have little impact on overturning resistance of the curved girder bridge.Fifthly,Single beam method and the entity unit method were adopted to establish the finite element analysis model of different bridges,and makes comparison analysis with calculation results of grillage method,providing the beneficial reference for bridge resistive overturning stability calculation method in the future.Sixthly,Selected typical overload vehicle in traffic flow and make the most unfavorable load condition.Then made study on the maximum load carrying capacity of the bridge structure in the limit state and serviceability limit state of typical vehicle respectively.