The Analysis On Vehicle-Bridge Coupling Vibration And Vehicle Ride Comfort Of Curved Continuous Beam Bridges

As a widely used bridge type,the highway curved continuous girder bridge deserves attention for its dynamic characteristics and vehicle comfort.Compared with a straight bridge,the research on the vehicle axle coupling vibration and vehicle comfort of curved bridge is relatively more lagging.Therefore,this research has important theoretical significance and engineering value.After summarizing a large number of relevant literature and combing the context of innovation and development of the subject,the research direction of this article is determined.The modeling method of bridge and vehicles are discussed and verified.by taking the actual bridges as the engineering background.On this basis,a 3D finite element model of a curved bridge and a 9-DOF vehicle model are established.The inverse Fourier transform method was used to simulate road surface roughness.The differential equations are established separately for the vericals and bridge,coupled by the coordination conditions of displacement and force.The Newmrak-? method is used.The finite element software ANSYS is used as an operation platform to compile the APDL iterative command flow to solve the equations.The calculation results are analyzed and summarized,the conclusions are as follows :(1)Compared to single-vehicle bridges,the static displacement of bridges will decrease when multiple cars cross the bridge.The specific regularity are related to the bridge span and distance.(2)The vibration of each direction of the bridge and the dynamic response of the vehicle are greatly affected by the radius of curvature of the bridge.They have a common law: the smaller the radius of curvature,the greater the dynamic response,and when the radius of curvature is less than 150 m,the dynamic response of the bridge is affected by the radius of curvature.The effect is very significant.When the radius is greater than 150 m,the influence of the radius of curvature tends to decrease.The influence of the radius of curvature on the torsion angle is mainly reflected in the static torsion angle,which has less influence on the impact coefficient.(3)With the increase of vehicle speed,the vertical and torsional vibration responses of the bridge show an increasing trend and there is a sudden increase near the vehicle speed of 30m/s.The lateral vibration displacement of the bridge increases with the increase of the vehicle speed.With the increase of vehicle speed,the safety of the vehicle is rapidly reduced,and there is no obvious pattern of comfort,but overall there is a trend of improvement.(4)As the position of the vehicle moves from the inside to the outside of the curve,the vertical vibration and the mid-span bending moment of the bridge show an increasing trend,while the torsional vibration and the mid-span torque of the bridge increase with the increase of the vehicle eccentricity value.Big.Vehicle safety and comfort also deteriorate as the location of the vehicle moves from inside to outside,but the impact is relatively small.