Stress Response And Rutting Analysis Of Asphalt Pavement Layer On Steel Bridge Deck Under Coupled Action Of Moving Load And Temperature

Since the founding of the People’s Republic of China,the nation has experienced rapid development in its infrastructure,with bridges being one of the most critical elements.Steel bridge deck pavement,as an essential step in the construction process,must withstand harsh conditions and is prone to rutting damage.Consequently,the pavement layer demands high-quality materials.Asphalt concrete has been widely adopted for bridge deck pavement due to its excellent workability,waterproofing,and bonding properties.Therefore,as China continues to raise its bridge quality standards,the study of asphalt concrete performance in pavement layers has become a research hotspot in bridge construction.This paper investigates the "epoxy asphalt concrete +epoxy asphalt concrete" structure,sets a temperature field and calculates it,and uses ABAQUS software to simulate the mechanical response of the pavement under moving loads.The study analyzes the deformation patterns of the pavement layer,estimates the rutting of the pavement layer,and holds significant practical value for the maintenance and upkeep of bridge pavement layers.First,this paper describes the analytical methods for asphalt concrete pavement layers,elaborates on the advantages and disadvantages of existing mechanical models,and ultimately selects the Bailey-Norton model with fewer parameters,a concise structure,and strong representativeness as the calculation model for studying asphalt concrete deformation patterns.Next,a model is established based on the Nanjing Yangtze River Bridge structure,and atmospheric temperatures for each month of the past years are collected.Since asphalt concrete experiences significant deformation at high temperatures,the temperature field at the moment with the highest temperature is selected.The DFLUX and FILM temperature field subprograms are used to create a temperature field model,which is then imported as a predefined field into the dynamic model.By comparing and analyzing the force conditions at various locations on the surface of the steel bridge deck pavement layer,it is determined that the maximum transverse tensile stress and maximum longitudinal tensile stress both appear at the surface pavement layer where the diaphragm top intersects with the U-shaped stiffening rib,identifying the most unfavorable location.Subsequently,by analyzing the stress response between layers and on the surface of the steel bridge deck pavement layer under moving loads,it is found that asphalt concrete is prone to interlayer slippage,and that the transverse shear stress is greater than the longitudinal shear stress,whether in a uniform or decelerating state.Thus,transverse shear stress should be considered as the mechanical control index for pavement layers.At the same time,the interlayer transverse and longitudinal shear stresses caused by load uniform or variable speed movement are both more than twice the surface layer,indicating that variable speed movement causes more severe interlayer damage compared to uniform speed movement under the same environmental factors.Moreover,the longitudinal shear stress of the asphalt concrete interlayer under load acceleration is greater than under uniform deceleration,which in turn is greater than under uniform speed movement,indicating that the longitudinal shear stress of the steel bridge deck asphalt concrete pavement interlayer is influenced by acceleration.Lastly,through the time-hardening creep model,the effects of various factors on rutting is analyzed.It is found that when other factors are the same,the higher the temperature,the faster the ruts develop,the slower the speed,the faster the ruts,and the greater the overload,the faster the ruts develop.This paper analyzes the influence of various factors on the rutting failure of steel bridge deck pavement under the action of moving load,which provides a valuable theoretical basis for pavement maintenance and maintenance.