Abstract
Aiming at the fatigue cracking of steel bridge deck pavement and the shortage of river sand resources, a sea sand RPC pavement scheme was proposed. Taking Quanhe steel box girder bridge as the research background, the simulation model was established by using ANSYS finite element software, and the mechanical simulation analysis of the steel bridge deck sea sand RPC-asphalt pavement composite structure was carried out to determine the most unfavorable load position. A three-point fatigue test was carried out to study the fatigue performance of the structure specimen, and a comparative analysis was made with the river sand RPCasphalt surface composite pavement structure. The results show that the maximum tensile stress and strain of RPC-asphalt pavement appear in the upper middle span of U-shaped stiffener of steel box girder, which are 0.5241MPa and 98.2με, respectively, and the surface of the pavement in this area is prone to crack. The RPC-asphalt surface composite pavement structure has not been damaged after 2 million times of fatigue tests, and has not been damaged after 1 million times of fatigue loading after secondary loading, which indicates that it has better fatigue performance.
Highlights
Asphalt mixture is often used in steel bridge pavement
When the fatigue loading force is higher than the initial loading force, the rigid flexible composite structure does not appear damage, so it can be seen that the composite pavement structure prepared by sea sand Reactive powder concrete (RPC) and river sand RPC has better fatigue performance, which can effectively prolong the service life of steel bridge deck pavement layer
Taking Quanhe Bridge as the background, this study carried out mechanical simulation analysis and experimental research on the steel bridge deck RPCasphalt pavement composite structure with sea sand, and made a comparative analysis with the river sand RPCasphalt pavement composite structure
Summary
Asphalt mixture is often used in steel bridge pavement. With the increase of traffic volume and heavy load phenomenon, fatigue cracking disease often occurs in steel bridge pavement. The rigid flexible composite pavement structure of "steel plate + cement concrete + asphalt pavement" is based on the concept of material gradient design to increase the overall stiffness of pavement system, change the stress state of bridge deck system, and inhibit the fatigue cracking of pavement. It is necessary to analyze the tensile stress of high performance concrete asphalt pavement structure of steel bridge deck to find out the most unfavorable position and provide parameters for fatigue test. Three-point fatigue test was carried out to verify the fatigue performance of the composite pavement structure with RPC of sea sand and asphalt surface, and the comparison analysis was made with RPC of river sand. The research results provide technical reference for the popularization and application of sea sand in rigid flexible composite pavement of steel bridge deck
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