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Study on the Dowel and Tie Bar in Jointed Plain Concrete Pavement

Author: ZhangHuaiZhi
Tutor: ZhaoMaoCai
School: Harbin Institute of Technology
Course: Road and Railway Engineering
Keywords: Concrete Pavement Dowel bar Trolley Load transfer
CLC: U416.216
Type: Master's thesis
Year: 2007
Downloads: 189
Quote: 3
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Abstract


Ordinary cement pavement rely settings seams to reduce the temperature and humidity stress undermines the integrity of the road , but the presence of the seams . In order to ensure the joint load transfer capability set dowel general contraction joints at set trolley at the longitudinal seam . Diameter and cross-sectional shape of the dowel load transfer capability and service life of the dowel has a direct relationship to the mechanical properties of different cross-sectional shape of the dowel , is still a lack of theoretical research ; rod in order to prevent the seams widened and to ensure the transmission of loads between the seams , but the seams between the load transfer capability with the increase in the amount of the seam open and significantly reduced, while the lever design method can not accurately reflect the impact of the Tie seams opening amount . In addition , compared with the dowel for the load transfer trolley existing adverse factors favorable factors . It is also necessary on trolley load transfer capability for quantitative analysis . The use of finite element software ANSYS , the establishment of a dual parameter foundation characteristics , to consider road panel with grass-roots contact , set seams of full scale finite element modeling and simulation basic direct shear tests , only consider a dowel , dowel local finite element model and set friction between the concrete unit . Take advantage of the full-scale model , dowel load transfer capacity of the trolley and different cross-sectional shapes ; using local model to analyze the phenomenon of dowel and concrete at the interface stress concentration and Void . Analytical method , considering the shear stress - slip of the bilinear relationship between road panel with grass-roots level , in accordance with the specification design Rod , calculate the amount of shrinkage temperature side of the longitudinal seam panels as well as the maximum tensile stress in the plate , for different types of grass-roots . The results showed that : different cross-sectional shape of the dowel bar road panel corresponding to the maximum deflection and flexural stress is essentially the same , while the concrete bearing stress at the interface , the first principal stress , the maximum shear stress significantly affected by the size and distribution of the dowel bar the impact of the cross-sectional shape , and appear in the dowel bar and concrete at the interface Void phenomenon depends on the cross-sectional shape of the dowel , and the cross-sectional shape and width of the Void ; maximum deflection of the longitudinal seam at the Trolley LO panel and reduce flexural stress ; trolley by the amount of temperature change and the impact of the grass - roots type of restrictions on the displacement of the plate edge , but also increase the maximum tensile stress in the concrete slab .

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Pavement Engineering > Road : use of the material points > Cement concrete pavement
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