The Research On Mechanical Behaviors Of The Curved Rigid Frame Bridge

As the highway transportation ernterprise developed rapidly in our country,the mountain ous area highway has got fast development,in order to meet the characteristics of mountainou s topography better,the curve of prestressed concrete continuous rigid frame bridge has been widely used,especially in mountain ravines,a lot of curved continuous rigid-frame bridges wi th high piers and long spans have been built.Because of the bending-torsional coupling effect of the curved girder bridges,the internal force and deformation of the curved girder bridges d uring the construction process will be more complex than the straight bridge.To sum up the st ructural mechanics analysis for curved continuous rigid-frame bridge with high piers and long spans is particularly important.This article is based on the Zixing highway Yangjiawan bridge,and using finite element software for simulation analysis on the bridge,to research structural mechanical behavior of grider on completion state under the girder self-respect,live load,prestress and temperature lo ad.The main results were as follows:(1)To summarize the structure and mechanical characteristics of curved girder bridges,a s well as the application and research status of curved continuous rigid-frame bridge with high piers and long spans at home and abroad.And combine with the construction experience of t he curved girder bridges in China,to sum up the common problems in designing and construc ting.(2)Based on the Yangjiawan bridge,and using finite element software such as Midas/Ci vil,by changing the structure of the geometric parameter(the radius of curvature,high pier),e stablished a series of different pier height and radius of curvature of the finite element model.(3)Analyzed the internal force and deformation of the curved girder bridges on completio n state,under the girder self-respect,live load,and prestress,and find out that: radius of curva ture has a little influence on longitudinal bending moment,but has much effect on the lateral bending moment and torque;high piers have a little influence on longitudinal bending momen t,but has much effect on the lateral bending moment and torque;radius of curvature has a littl e influence on the vertical displacement,but has much effect on the lateral displacement and t orsional angular displacement;high piers have less effect on the vertical displacement,but big ger influence on the lateral displacement and torsional angular displacement.(4)Analyzed the change of internal force of the curved girder bridges on completion state under temperature load,and find out that under the same radius of curvature,each mechanical properties of the curved girder bridges shows the opposite under heating or cooling effect.W hen heating up,the smaller the radius of curvature are,the more obvious of the longitudinal b ending moment,torque and lateral bending moment change;the greater the High piers are,the more obvious of the longitudinal bending moment,torque and lateral bending moment change.