1. Key Laboratory of Highway Construction & Maintenance in Loess Region, Shanxi Transportation Research Institute, Taiyuan Shanxi 030006, China;
2. Shanxi Conservancy Technical College, Yuncheng Shanxi 044004, China
Joint Load-transfer Prediction Model Considering Dowel-bar Position Deviation in Rigid Pavements
ZHANG Yan-cong1, GAO Ling-ling2
1. Key Laboratory of Highway Construction & Maintenance in Loess Region, Shanxi Transportation Research Institute, Taiyuan Shanxi 030006, China;
2. Shanxi Conservancy Technical College, Yuncheng Shanxi 044004, China
摘要A double-layer structure model of pavements that considered interlayer contact status was established to manage the dowel-bar position deviation problem in rigid pavements. The deviation effect of three-dimensional positions, such as horizontal angle, vertical angle, and embedded depth, on joint load-transfer capacity was analyzed. A load-transfer capacity prediction model that considered dowel bar position deviation was established via ternary nonlinear regression. Load correction factor and its range were also proposed. This prediction model can effectively reflect the joint load-transfer capacity during dowel position deviation after verification via falling weight deflectometer testing. The horizontal angle of the dowel bar minimally affected joint load-transfer coefficient. By contrast, the joint load-transfer coefficient decreased almost linearly as the vertical angle increased. The coefficient reduced by approximately 12% when the vertical angle was 15°. Meanwhile, the load-transfer coefficient was maximized when a dowel bar was embedded in the middle of a surface. The coefficient would decline either upward or downward. The coefficient particularly decreased by 10% when the position was 2 cm downward.
Abstract：A double-layer structure model of pavements that considered interlayer contact status was established to manage the dowel-bar position deviation problem in rigid pavements. The deviation effect of three-dimensional positions, such as horizontal angle, vertical angle, and embedded depth, on joint load-transfer capacity was analyzed. A load-transfer capacity prediction model that considered dowel bar position deviation was established via ternary nonlinear regression. Load correction factor and its range were also proposed. This prediction model can effectively reflect the joint load-transfer capacity during dowel position deviation after verification via falling weight deflectometer testing. The horizontal angle of the dowel bar minimally affected joint load-transfer coefficient. By contrast, the joint load-transfer coefficient decreased almost linearly as the vertical angle increased. The coefficient reduced by approximately 12% when the vertical angle was 15°. Meanwhile, the load-transfer coefficient was maximized when a dowel bar was embedded in the middle of a surface. The coefficient would decline either upward or downward. The coefficient particularly decreased by 10% when the position was 2 cm downward.
基金资助:Supported by the National Natural Science Foundation of China (No.51308329); the Shanxi Natural Science Foundation Project (No.2013011027-1, No.2015021115); and the Shanxi Province Communications Department Science and Technology Project (No.2015-1-26)
张艳聪, 高玲玲. 考虑传力杆位置偏差的刚性路面接缝传荷预估模型[J]. Journal of Highway and Transportation Research and Development, 2015, 9(3): 20-26.
ZHANG Yan-cong, GAO Ling-ling. Joint Load-transfer Prediction Model Considering Dowel-bar Position Deviation in Rigid Pavements. Journal of Highway and Transportation Research and Development, 2015, 9(3): 20-26.
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2015, Vol. 9 
