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• W4293491529 endingPage "100847" @default.
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• W4293491529 abstract "• Full-scale experiments were conducted at the laboratory conditions under monotonically increasing loading. • 2D digital image correlation method was employed to obtain full-field deformation measurement on the sleeper surface. • Effect of substructure reinforcement and ballast settlement level on the sleeper behavior was investigated. • A new back-calculation process to derive the ballast pressure distribution was suggested based on the vertical deflection shape of the sleeper. It is well known that the moment distribution on the sleepers is very sensitive to deformations of the ballast caused by cyclic axle load over time and other environmental factors. To limit the non-uniform deformations of the ballast, reinforcement of the ballast or sub-ballast with geosynthetics can be a cost-effective solution. In this study, B70 prestressed concrete sleepers were tested under static loading conditions in a special test box developed to simulate the in-situ condition of a railroad track in the laboratory. The main test parameters were the degree of settlement of the ballast and the type of geosynthetics used. Four different settlement levels and two reinforcement types (sub ballast with geonet and ballast with geocells) were considered. The deflections and surface strain maps of the concrete sleepers were measured using the two-dimensional digital image correlation (2D-DIC) method. Following the experimental part, an analytical study was also carried out to investigate the ballast pressure distribution and consequently the moment distribution on the concrete sleeper. Based on the vertical deflection shape of the sleeper, a new algorithm was developed to derive the ballast pressure distribution under the sleeper by back calculation. The experimental results showed that using geocells to reinforce the ballast layer increased the stiffness of the ballast against the vertical deflection of the sleeper. From the analytical results, the magnitude of the negative bending moment increased significantly with increasing settlement level." @default.
• W4293491529 created "2022-08-29" @default.
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• W4293491529 date "2022-11-01" @default.
• W4293491529 modified "2023-10-16" @default.
• W4293491529 title "Effect of support conditions on the performance of B70 sleeper overlying reinforced ballast and sub-ballast layer: Experimental and analytical investigation" @default.
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• W4293491529 doi "https://doi.org/10.1016/j.trgeo.2022.100847" @default.
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