Study On Stability Of Continuous Curved Box_girder Bridge

With the development of transportation construction,curved girder bridge is widely used as the structure for expressways and flyovers extensively.however.Due to the presence of the curvature of the curved bridge,the form of the force-deformation of the curved bridge is verycomplicate. Various problem emerged in the use of the curved girder bridge, and the stability and security of the curved bridge is been seriously affected. So,the research in the stability of the curve bridge is very meaningful for its Further development.In this article,firstly,I introduce the application situation and research situation of the curved bridge.then i introduced the characteristics of the curve of the bridge by derivation the Vlasov differential equations.because of the bending and torsion coupling effect,the bending moment will be accompanied by the generation of the torque,and the torque will be accompanied by the bending moment by the same token.coupled with prestressed effects, temperature effects and the effect caused by centrifugal force of the vehicle load,the curve bridge internal force distribution is extremely complex.then i introduced the theory and method of calculation of the curve bridge.after the introduction of the structure characteristics and force characteristic of the curved bridge,i will explain the common form of the instability of the curved bridge,such as bearing separated from the beam,beams flip,beam capsize which severely affected the safety of bridge,and ianalyze the reason of it.the next,i give a remedial measures which can provide a reference for bridge designer.At last,Through the test combined with theoretical analysis,To determine the stability of the curved bridge.Through the test data combined with the value of the theoretical calculations,calculate the calibration coefficient. Through the calibration factor determine the safety reserves of the bridge under partial loads,and then determine the stability of the curved bridge.Finally, in order to prevent overturning of the bridge caused by overloading of heavy vehicles partial loads.Provide a reinforcement scheme for similar bridges.to analysis the curve beam internal forces and reaction forces caused by dead loads, prestressed concrete shrinkage and creep based on the finite element model. Some rules of the internal force distribution of the various roles can be have from model calculated data to provide a reference for the design in future.