Viscoelastic Deformation Mechanism And Rut Analysis Of Bridge Deck Pavement Based On Inter-layer Contact Friction

With the development of China’s economy,the construction of road transportation infrastructure has also developed rapidly,and the technical requirements for bridge quality and its traffic performance are getting higher and higher.Therefore,there are more and more mechanical analysis studies on bridge structures.The performance research of asphalt concrete of its pavement structure has become a research hotspot.In this paper,the viscoelastic parameter model of the asphalt mixture material is described.The ANSYS finite element software is used to simulate the mechanical response of the bridge deck under the traffic load.The permanent deformation development law of the pavement layer provides a reference for the construction and maintenance of the bridge deck pavement layer.First of all,this paper uses the theory of viscoelastic mechanics,using Burgers model as the basic model to describe the viscoelastic energy of asphalt layer materials,and analyzes the deformation response of asphalt concrete pavement in different contact states between layers,by setting different asphalt layers Thickness,adhesive layer thickness and contact cohesion are analyzed,the mechanical response of the pavement under different conditions is analyzed,and the best match of various parameters is discussed as the basis for subsequent in-depth analysis.Secondly,the law of deformation and stress of the pavement layer under moving load is analyzed,and the viscoelastic deformation of the pavement layer under different moving speeds is compared;the driving state of the vehicle under poor road conditions is simulated by a simple harmonic load.Deformation and force changes of the bridge deck pavement are compared with the response of the pavement when moving;and analyze the deformation law of the asphalt layer during deceleration and the effect of variable-speed moving loads on the deformation of the pavement under different horizontal forces;By setting the above different moving load conditions,the deformation and stress law of asphalt concrete pavement of bridge deck is analyzed.Finally,the permanent deformation analysis model of asphalt concrete pavement was established by ANSYS,and the Burgers model was used as the viscoelastic model of asphalt mixture,and five load conditions were set up to numerically simulate the permanent deformation of the pavement layer.The development rule of the sinking rut and uplift rut of asphalt layer under working conditions,and the viscoelastic creep law of asphalt concrete pavement;at the same time,the influence of different temperature on the development of uplift rut and sinking rut of asphalt layer is also studied and discussed And explain the change law of the permanent deformation of the asphalt layer,and provide a theoretical reference for the improvement of the design method of the asphalt bridge deck pavement.The purpose of this study is to apply the theory of viscoelastic mechanics to analyze the mechanical response of bridge deck asphalt pavement,analyze the effects of various design factors on the performance of the bridge deck pavement structure under moving loads,and provide the bridge deck pavement layer.The optimal design of the structure and early disease prevention provide an effective theoretical basis.