Analysis On The Transverse Force Of Concrete Continuous Curved Girder Bridge Based On Lateral And Vertical Coupled Effecting

Transverse climbing is one of the most common diseases of concrete curved girder bridges,which has serious affectson traffic safety and it is the key to analyze the transverse climbing by researching on the transverse force of concrete curved girder bridge.At present,the calculation of transverse forces under vehicle loads has become one of the hottestissues in the study of transverse creep,and it is necessary to consider the vehicle-bridge coupling effect when calculatingthe transverse forces of structures under vehicle loads.The existing research results mainly analyzed the influence of vertical vehicle-bridge coupling effect on the dynamic responses of curved girder bridges,but the lateral vehicle-bridge coupling was seldom taken into consideration.In order to obtain the accurate solution of the transverse force of concrete curved girder bridge and provide some references and significance for preventing the transverse creep diseases of concrete curved girder bridge,the influence of lateral vehicle-bridge coupling effect on the transverse force of concrete curved girder bridgewas further taken into account based on the coupling effect of vertical vehicle-bridge.The main research contents are as follows:(1)By comparing the research results at home and abroad,it was summarized in this paper that the analysis method considering the coupling effect of transverse and vertical vehicle-bridge and the factors affecting the transverse force of concrete curved girder bridge were obtained and road roughness was introduced as the initial excitation of vehicle-bridge coupling vibration.(2)Finite element software ANSYS was used to establish the refined model of slab rubber bearing.On this basisof the former,the whole bridge model and the vehicle model were established respectively.The coupling effect of the vertical and horizontal vehicle-bridge was simulated by the equilibrium and geometric coordination conditions of the forces between two models,and at the same time,the various responses of the concrete curved beam bridge were obtained.(3)The vertical and lateral dynamic responses of concrete continuous curved girder bridges at key locations were discussed by considering the coupling effect of vertical and transverse bridges and different vehicle weights.The mechanism and law of creep generationwere explored by analyzing the friction resistance and anti-sliding property of supports.The results show that it is necessary to consider the cross-vertical vehicle-bridge coupling effect in the stress analysis of concrete curved beams.With the increase of vehicle weight,the internal force of structural displacement will increase.Therefore,the lateral creep and bearing slip and shear failure of curved girder bridges can be prevented by limiting load and weight.(4)By changing the two key parameters of vehicle speed and superelevation,the influence of centrifugal force on the lateral force of curved girder bridge under different speeds and superelevationwas analyzed.It is concluded that reducing vehicle speed or increasing superelevation are beneficial to reducing the lateral force of main girder,lateral displacement and lateral reaction force of support,but it can achieve better results by changing vehicle speed,therefore,it is necessary to limit the speed of the vehicle on the curved girder.(5)By changing the vehicle driving position and road roughness,the stress of curved girder bridge wasfurtherstudied,and the relevant time history curveswere drawnto compare the peak dynamic response of key sections and supports of curved girder bridgesandexplore their effects on the stress of curved girder bridges.The results show that driving close to the outside of the curved beam is very harmful to the lateral force of the curved beam bridge,and necessary measures should be taken to improve the lateral bearing capacity of the outer pier in order to ensure the safety of the structure under the most adverse load conditions.Pavement roughness will increase the transverse and vertical dynamic response of curved girder bridges,so it is necessary to select the higher grade pavement in bridge deck pavement.