Dynamic Behavior Analysis Of Bridge Deck Pavement Based On Temperature Field And Tyre-Road Contact Stress

Steel-concrete bridges are widely used because of their high strength and low selfweight.However,fatigue cracks,ruts and other damages occur prematurely during the service life of bridge deck pavement,and the tire-road dynamic coupling effect cannot be ignored.Therefore,it is necessary to study the dynamic behavior of steel-concrete bridge deck pavement under the action of tire-road contact distributed stress.Asphalt mixture is a kind of temperature sensitive material for bridge deck pavement.Temperature change directly affects the stress state of bridge deck pavement.Therefore,it is of theoretical significance and engineering application value to study the dynamic behavior of bridge deck pavement under the action of temperature field and tire-road contact distribution stress.In this thesis,considering the viscoelasticity,temperature field and complex distribution stress between tire and road of bridge deck pavement,the dynamic behavior of bridge deck pavement is studied accurately,and the influence and damage of different parameters on its dynamic behavior are analyzed.The main work is summarized as follows :Firstly,a method is proposedfor to obtain the master curve of relaxation modulus by improved shift factor,and then the viscoelastic parameters of asphalt mixture are obtained.The correctness of the viscoelastic parameters is verified by indoor rutting test.According to the design drawings of a high-speed bridge,the finite element model of viscoelastic bridge deck pavement is established.Secondly,the temperature field is calculated by extracting the local summer atmospheric temperature and solar radiation data of the bridge,and the correctness of the temperature field is verified by the measured temperature on the bridge.Then,the temperature field is applied to the finite element model of viscoelastic bridge deck pavement.By coupling the refined tire finite element model with the bridge deck pavement model,the tire-road coupling system model is constructed and the three-way contact stress is extracted.After that,the dynamic behavior of the road surface under the three-way distributed stress and imprinting of the tire-road contact is reconstructed,and compared with the test results to verify its correctness and effectiveness.Finally,combined with the viscoelasticity of asphalt mixture and the temperature field of bridge deck pavement,the dynamic behavior of bridge deck pavement under reconstructed tire-road contact stress under different conditions is simulated and calculated.In addition,the dynamic behavior of bridge deck pavement under special conditions such as deterioration of bridge deck pavement and multiple wheels is considered.The research conclusion shows that the dynamic behavior of viscoelastic bridge deck paving is greatly affected by temperature.The overloading of heavy-duty cars,abnormal tire pressure and other phenomena will aggravate the damage of bridge deck paving;The dynamic behavior of bridge deck paving with different asphalt materials is quite different.The deterioration of the bridge deck will accelerate the early failure of the bridge deck and affect the dynamic behavior of the bridge deck pavement.The thesis research can provide a certain reference for the design,maintenance and repair of bridge deck paving.