Finite Element Modeling Of Heavy-Duty Vehicle Tires And Analysis Of Tire-Road Coupling Dynamic Behavior

At present,the highway and bridge system in China is constantly improving,and the scale of transportation is expanding.At the same time,the problem of vehicle overspeed and overloading is also increasingly serious.Therefore,the deck pavement is more prone to cracks,ruts,and other damages that affect its service life.The asphalt mixture is a temperature sensitive material,and its viscoelastic properties are very important for the study of dynamic response of deck pavement.The dynamic behavior of deck pavement is closely related to the vehicle loads.As a vehicle-road contact traveling component,tires play an important role in transmitting loads.During vehicle travel,tire ground pressure exhibits a non-uniform distribution in three directions.Therefore,it is of great significance to study the contact relationship between tires and deck pavement under vehicle bridge dynamic loads and the dynamic behavior of deck pavement considering viscoelastic properties.The main work of the thesis is as follows:Firstly,based on the relevant theories of vehicle tires,the thesis uses ABAQUS finite element software to establish a heavy radial tire model with model number12.00R20.The geometric characteristics of the inflated tire were simulated and compared with the design values.The radial stiffness of the tire was calculated and compared with the test data.The correctness and effectiveness of the tire model are verified.Secondly,based on the actual bridge structure design drawings,a finite element model of deck pavement considering the viscoelastic properties of asphalt materials is established.The correctness of the finite element model is verified through indoor rutting tests.Establish a dynamic model of the tire-deck pavement coupling system with the tire model.Through literature comparison,the correctness of the coupling model can be verified.It can be used to study the three-dimensional tire ground pressure and the dynamic response of viscoelastic deck pavement.Thirdly,the three-dimensional ground pressure of tires under static loads is studied using the constructed tire-deck pavement coupling system model.A full-bridge finite element model including deck pavement and a full-vehicle multi-rigid body model with Fiala tyres were established by using multi-body dynamics software UM,and a vehiclebridge rigid-flexible coupling system dynamic model was built.The rear axle dynamic suspension force of heavy-duty vehicle under coupling dynamic force is calculated and extracted,and applied to the tire model.The change of tire ground pressure and imprint between tire and road under coupling dynamic suspension force is analyzed.Finally,the dynamic behavior of fine tire and deck paving under different load,tire pressure,temperature,speed and rolling conditions was studied by using the tiredeck paving coupling system with dynamic coupling suspension force.The dynamic response of the deck pavement under the action of tire coupling dynamic suspension force and fixed axle load is compared and analyzed.The stress state of asphalt pavement on bridge deck at bridge support is analyzed.The results show that the dynamic coupling suspension force affects the contact relationship between tire and deck pavement,which changes the stress state of deck pavement.Therefore,the dynamic coupling suspension force should be considered in the study of tire-road coupling dynamics.Due to the viscoelastic properties of asphalt,the pavement on bridge deck will have residual deformation and the amount of deformation will increase with increasing temperature.Rutting damage is easy to occur under repeated vehicle loads.The research in this thesis can provide certain engineering reference for the design,maintenance and maintenance of Expressway deck pavement.