Study On Vehicle Load Effect Of Curved Ramp Continuous Rigid Frame Bridges

With the rapid development of China’s highway traffic, motorway service standards areimproving. Especially in the mountain plateau,in order to drive comfortably and well adaptedto the terrain limitations, bridge linear is crucial. So curved ramp continuous rigid framebridge is used very widely in this region. With the increasing of curved ramp continuous rigidframe bridge, more and more problems are exposed, such as the girder cracks are more thanother same cross straight continuous rigid-frame structure, reduced endurance, etc.For the safeoperation of the bridges in service and the reasonable design of newly built Bridges, the studyon these problems is imperative.The vehicle load effect is the main live load of curved ramp continuous rigid framebridge,with the specific structure form of curved ramp continuous rigid frame bridge,Diseases of such bridges will be inextricably linked with the the combined effects of the two.So the study on the vehicle load effect on the curved ramp continuous rigid frame bridge isthe key to solve this problem.Firstly, the paper use theoretical calculations to study the stress state of the curvedcontinuous rigid frame bridge under the action of lane load, impact force and centrifugal forcerespectively, and get the change rule of the biggest longitudinal bending moment along withthe change of radius of curvature; Through the theoretical analysis of the ramp continuousrigid frame bridge respectively under the action of lane load and the impact force, we get thechange rule of the biggest longitudinal bending moment along with the change of longitudinalslope.Secondly, using the finite element software MIDAS/CIVIL to analysize the curvedcontinuous rigid frame bridge respectively under the action of lane load and impact force, toget the change rule of maximum longitudinal positive moment and maximum torque with thechange of radius of curvature; we analysize the ramp continuous rigid frame bridge and getthe change rule of maximum longitudinal positive moment and maximum torque along withthe change of longitudinal slope; similarly we analysize the curved ramp continuous rigidframe bridge and get the change rule of maximum longitudinal positive moment and maximum torque along with the change of longitudinal slope.Then use the finite elementsoftware MIDAS/CIVIL to analysize the curved continuous rigid frame bridge respectivelyunder the action of centrifugal force and get the change rule of maximum longitudinalmoment, maximum lateral bending moment and maximum torque with the change of radiusof curvature.Finally, compare a series of change law the from theoretical calculation method with thechange rule from numerical simulation method, thus verify the internal force influence law ofthe vehicle load on curved ramp continuous rigid frame bridge,and provide guidance to thedesign and construction of curved ramp continuous rigid frame bridge.