Abstract
The wide-use airport cement concrete direct-thickening double-deck pavement slabs (ACCDDPS) were selected as the research object to study their mechanical properties. The airport runway simulation test station (ARSTS) was used to conduct indoor tests to demonstrate the distribution of tension stress at the bottom of slabs and slabs deflection. Furthermore, ANSYS software was applied to establish finite element model (FEM) of ACCDDPS and analyze the mechanical laws under different loads. The indoor tests results are in good agreement with the ANSYS simulation results, and some consistent conclusions can be obtained that the maximum tension stress increases with wheel load, and the slab middle of the longitudinal edge is a critical position. In addition, we studied the influence of covered layer thickness, elastic modulus, and slab size on pavement slab mechanical properties by ANSYS, and we concluded that although the structural parameters are different, the critical position of ACCDDPS is still in the middle of the longitudinal edge. However, for the covered layer and the original surface layer, the law that the tension stress values vary with the structural parameters is different, but the maximum deflection value is about 0.1.
Highlights
E airport cement concrete direct-thickening double-deck pavement slabs (ACCDDPS) mentioned in this paper means that the cement concrete thickened layer is directly laid on the clean old concrete cement pavement surface, which is characterized of a certain adhesive force and frictional resistance between the upper and lower two layers, resulting in a better overall stiffness in the upper and lower slabs
Binchen et al [3] established a fine airport pavement finite element model based on the Winkler foundation model to analyze the number of slabs required when the wheel loads are applied to the slab center, slab edges, and slab corners. rough analysis, he gave some suggestions: when the load is at the middle of the slab, it is recommended to establish a four-slab model; when the load is at the slab edge, two- or four-slab models are established; when the load is at the slab corner, it is recommended to establish four-slab model
We used finite element model (FEM) to analyze the in uence of covered layer thickness, covered layer elastic modulus, and slab size on ACCDDPS mechanical properties
Summary
Collect the value of the surface deflection, the maximum tension stress at the bottom of the slab, and the number of repeated action when the specimen is fractured. Continuing with other experiments, the vertical loads of the wheel are sequentially set to 103.07 kN, 129.16 kN, and 196.52 kN, and the other procedures are the same as above. The tension stress of original surface layer increases with the increase of wheel load; the rate of growth has been slightly increased after the point of 129.16 kN.
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