Analysis Of Dynamic Responses Of Continuous Rigid Frame Bridge With High Piers And Long Span Under The Vehicles Loading

Nowadays the research on dynamic responses of rigid frame bridge especially continuous rigid frame bridge with high piers and long span under the vehicles loading is few. Our country's active bridge design standard defines the vehicles loading's impact coefficient as a function of bridge's base frequency. This has been a very great improvement compared to the original standard. However, using sole impact coefficient to the entire bridge is incompletely reasonable. Different positions' dynamic responses of bridge are different. We should specify different impact coefficient. Moreover it is also a research topic that the evaluation criterion of impact coefficient's effect is based on bending moment or displacement. In addition, the standard has not either considered the influence to the bridge's impact coefficient caused by damping, vehicles models, vehicles' running velocity,etc..This article first introduces the related theory about dynamic interaction between vehicles and bridge and its realization in the ANSYS. The concrete content includes: bridge inherent vibration theory, static analysis theory, damping theory, theory of dynamic interaction between vehicles and bridge, transient dynamics theory, geometry nonlinearity theory. Then carry on dynamic analysis to Hainan Sanya gulf bridge using ANSYS and compare the calculated results with the experimental results. Confirm that using ANSYS to model and analyze the dynamic interaction between vehicles and bridge is feasible .This article analyzes dynamic responses of a continuous rigid frame bridge under construction with high piers and long span under the vehicles loading.First carry on the self libration analysis to the bridge, use spatial four nodes elastic shell element SHELL63 and spatial two nodes elastic beam element BEAM44 to model the bridge. The SHELL63 element both has bending ability and membrane ability. It can be regarded as combination of plane stress element and plate bending element. The BEAM44 element can bear pulling and pressing,bending,twisting. When the shear deformation influence not considered, its elastic rigidity matrix is same as spatial beam element's rigidity matrix educed from classic beam theory.Then analyze different position's dynamic responses of bridge under travelling loading, the vehicle's travelling velocity's influence to the dynamic responses,the impact coefficient evaluation criterion's difference between bending moment and displacement, the influence to the bridge's dynamic responces caused by bridge...