Study on Economical Interlayer Bonding Scheme and Application Base on Light Composite Bridge Deck System
In order to solve the technical problems of early failure of the surface layer and fatigue cracking of orthotropic steel bridge panels,a scheme of fiber reinforced concrete lightweight composite bridge deck system has emerged in recent years.The fiber reinforced concrete is integrated with steel box girders through shear necks,and the surface layer uses 35mm-50mm asphalt mix,among which the rigid and flexible interface bonding performance is the key to the successful implementation of this scheme.Based on the steel deck paving project of the Jinhai Highway Bridge in Zhuhai,the paper investigates the bonding properties between the pavement layers of the FRC+SMA10 fiber reinforced concrete lightweight composite bridge deck system.Midas was used to create a numerical model of the bridge deck and analyze the maximum stress distribution between the lower layers of heavy traffic.The influence of the asphalt mix design and the amount of gravel in the surface course on the bond performance of the pavement layers was analyzed by experiment and the best design was recommended.The test results show that;1)The mix grade of the asphalt layer has a significant influence on the interlayer bond strength,and that the fine mix grade is helpful in improving the interlayer bond strength of the pavement structure.When the asphalt dosage is 1.8 kg/m2 and the gravel distribution is 8 kg/m2,the interlayer bonding performance of the fiber reinforced concrete lightweight composite bridge deck system is the best;2)The optimized synchro gravel cohesive layer scheme can meet the maximum shear stress requirement calculated by finite element model.Based on the tracking and observation of solid engineering,the scheme has good application effect and good economic benefit,which can be promoted and applied in similar projects.
万方数据
维普
