Research on the Steel Bridge Pavement Structure of the Double-layer SMA Based on Mobile Load
In order to reveal the reason for the early disease of the double-layer stone mastic asphalt(SMA)pavement of Luobu bridge,a 3D finite element model was established by ABAQUS finite element analysis software.The mobile load was applied on the model.Firstly,the mechanical response of the pavement layers was studied along the driving longitudinal direction.The most unfavorable section of the mechanics index was compared and found;Then,the dis-tribution rules of mechanical indicators in the horizontal and vertical direction was studied under three representa-tive mobile loads to reveal the most unfavorable position of mechanical indicators;Finally,based on the cause of early disease of double-layer SMA steel bridge pavement,the structure was targeted optimized.The mechanical re-sponse with buffer layer was further studied.It was verified that the optimized pavement layer has better mechanical structural performance.Research shows that the inter-layer sliding disease of double-layer SMA steel bridge pave-ment is mainly caused by"rubbing"of inter-layer shear stress.The"rubbing"effect has the characteristics of the op-posite directions and the short peak interval;That the worse contact conditions of the pavement layer and steel bridge surface layer will accelerate the fatigue and cracking of the paving layer;When the friction coefficient is reduced by 0.2,tensile strain of asphalt layer increase by 3.26％averagely;The shear stress situation of inter-layer and the SMA bridge buffer layers has obvious more improvement than before optimization;Under the same working condi-tions,the optimized maximum shear stress of the inter-layer and asphalt layer are reduced by 25％～30％and 12％～16％respectively.
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