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Force transfer performance of reinforcement in small concrete block of slip form track of railway bridge

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Document pages: 15 pages

Abstract: In recent years, some researches have been carried out on the sliding slab track of railway bridge. One of the most important considerations in the design of slide track is to evaluate the shear capacity of laterally supported concrete blocks embedded with load transfer reinforcement. There are great differences in the prediction of the performance of reinforced dowel bars by existing models. Therefore, in this study, the actual force transfer performance of reinforcement embedded in small concrete blocks is widely studied through experiments. The test variables are concrete compressive strength, dowel diameter and yield strength, sample thickness and dowel spacing. The existing model predictions are quite different from the experimental results. The maximum force transfer increases with the increase of concrete compressive strengthstrength and dowel rebar diameter increased, while it did not increase considerably with other test variables. Unlike in existing models, the shear slip at the maximum dowel force decreased as the dowel rebar diameter increased. Existing models significantly underestimated the maximum dowel force of the dowel rebars with small diameters and overestimated it for the dowel rebars with large diameters. This work can be useful for developing a more rational model to represent the actual dowel behavior of the rebars embedded in small concrete blocks.

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