Study On Rutting Prediction Of Long-span Steel Bridge Deck Compound Gussasphalt Pavement

As one of the most important part of bridge crane system,bridge deck pavementis highly regarded by the researchers for higher requirement than general pavementand more harsh conditions of use. The steel bridge deck pavement rutting is apermanent deformation and also one of the main diseases of pavement layer. In orderto get the rules of rutting of Long-span steel bridge deck compound Gussasphaltpavement,these steps are used: Firstly,rutting formation mechanism anddevelopment rules is analyzed.Secondly, the modified Burgers model is used tosimulate viscoelastic plasticity of pavement.Thirdly, The material parameters ofasphalt pavement is regressed through uniaxial creep test.Fourthly, a model isestablished through finite element software to predict rutting depth.Finally, therutting depth is predicted and the influence of various factors on rutting is analyzed.First of all, the domestic and foreign large span steel box girder bridgepavement rut spot survey data is collected. The uniaxial creep test is used todetermine the material parameters in the prediction model combine with thepavement forms of Gussasphalt+high elastic modified asphalt on Nanjing fourthYangtze River Bridge.Then, in the light of the pavement structure above,a steel bridge deck pavementlocal beam segment model is established through a finite element software calledABAQUS.The changes of rut depth with the factors as follow: load position,overload,pavement thickness combinations and environment temperature.Finally, combine with the accumulative equivalent axle, the maximum totalrutting amount of Nanjing fourth Yangtze River Bridge is estimated as13.4mmthrough the finite element model has been established,and the measured value erroris5.51%.The researches show that, for Gussasphalt+high elastic modified asphaltconcrete structure, The rut mainly occures in the Gussasphal concrete layer, reaching63%of the total.The rut increases rapidly with the increase of the thickness ofpavement layer.It also increses along with the increase of axial load.And it increasesalong with the change of load position; especially the transverse load change. Thestudy is of great significance in the design of anti rutting, rutting predition and lifeprediction for the same type of steel bridge deck pavement.