Experiment Research About Fatigue Property Of FRP-epoxy Gravel-asphalt Deck Pavement Structure

Accompanied with the rapid development of transport over the past decades,Chinahas completed dozens of long-span steel box girder bridges,the design of pavementstructures is one of the hot and difficult points.Fatigue failure as one of the mainstructure of steel deck pavement disease.Often lead to early pavement structure damageand affect its safety and functionality.How to address the fatigue of long span steelbridge deck pavement damage,It has important significance for design and engineeringpractice of bridge deck pavement.This paper first analysis of typical failure types of the long-span steel bridge deckpavement,Especially pointed out that the fatigue of steel deck pavement damage is themain form of pavement damage.According to the technical status and developmentanalysis of the steel deck pavement structure,and the technical defects and thebottleneck of the development of pavement structure of the existing asphalt concretesteel bridge,Introduced for bridge structure, component has high durability advantagesof fiber reinforced composite and epoxy gravel material and traditional asphalt mixtureto form a new structure of FRP-composite epoxy asphalt concrete steel bridge deckpavement gravel.Theoretical and experimental studies had shown that new pavementstructure structures forms of rationality and superiority of the structure, function andengineering feasibility,and the advantages of using the structure of the short-termeffect.Secondly,to study the fatigue properties of steel deck pavement structure,Throughthe summary of domestic and foreign scholars on the fatigue property of steel bridgepavement research,Combined with United Kingdom standards specification for fatigue,to select practical bridge section in the development of finite element model calculationand analysis.Depending on the model line to determine the impact of vertical andhorizontal steel bridge the most unfavorable load position.Pointed out that this new typeof pavement of steel bridge deck to the most negative aspect of stress as well as bondingFRP and asphalt layer stress,to evaluate the largest horizontal tensile stress, maximumshear stress of asphalt layers. Regarded as the stress of new pavement design controlvalue.It is used to guide the design of FRP-epoxy grave-asphalt pavement structure.Finally, to select the appropriate project theory of fatigue damage for the steel deck pavement,Combined with fatigue test of the composite beam structures and stressequivalent principles,to derived the fatigue life prediction formula of pavement structureFRP-epoxy gravel-asphalt concrete.