科研之友
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摘要
The Nizhou Waterway Bridge of the Second Humen Bridge is a double-tower steel box girder suspension bridge with a span of 1 688 m, consisting of an orthotropic steel deck paved with epoxy asphalt mixture. In order to improve the service life of the epoxy asphalt overlay of the bridge, we studied the influential factors on ultimate stress of the fatigue durability of the epoxy asphalt pavement. Based on the four-point bending fatigue tests of beam specimens, a three-dimensional finite element model of local beam section was established by using the Abaqus software to analyze the ultimate stress of the pavement at the most unfavorable sites. The results show that the fatigue endurance limit of epoxy asphalt mixture is 578με; the stress and strain of pavement significantly decrease with the increase of elastic modulus of overlay, and the fatigue endurance limit is about 2 687 MPa. What's more, the strain of the epoxy asphalt pavement layer is positively correlated with the grounding pressure of the vehicle, and the grounding pressure for the fatigue endurance limit is 1.59 MPa. Consequently, the elastic modulus of the epoxy asphalt overlay should be appropriately increased, and the axle load of the passing vehicle should be strictly controlled, so that the durability of the pavement layer of the bridge can be improved.
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