Linear And Nonlinear Mechanical Analysis On Asphalt Concrete Bridge Deck Pavement Of Continuous Rigid Frame Bridge

ABSTRACT:Asphalt concrete bridge deck pavement is an important part of bridge system, and its mechanical characteristics are different with general pavement structure. If disposed improperly, asphalt concrete deck pavement is more prone to deterioration. At present, during the design of bridge structure, asphalt concrete deck pavement is only considered as a structural layer, which is generally not for specialized calculation and analysis. And the analysis for effect of overload, vehicle speed and material damping is very limited. Linear and nonlinear mechanical characteristics on asphalt concrete deck pavement are analysed for a continuous rigid frame bridge in Leixi highway.First, deterioration types and deterioration mechanism of asphalt concrete pavement are reviewed. Second, the whole bridge model is established using finite element software Midas to calculate the internal forces of the most unfavorable section. The most unfavorable position of asphalt concrete deck pavement is determined according to the whole model. Third, the local model of most adverse position of asphalt concrete deck pavement is established with the finite element software Abaqus in order to study mechanical properties of asphalt concrete deck pavement. The effects of overload, vehicle speed and material damping, horizontal load, moving load and hole water freezing are considered in the study.To simulate the impact of vehicle load on asphalt concrete pavement, two modes of moving load and single dynamic load are employed. It is found that there is not much difference in this two modes. In addition, the effects of concrete shrinkage and creep are analyzed in terms of elastic modulus of concrete, cement type and loading age. Furthermore, the hole water freezing is also discussed in view of the location, size and shape of the hole.On the basis of the above research results, practical measures related to temperature control, compaction of asphalt concrete, the interlayer adhesion are proposed for better asphalt concrete deck pavement construction. Meanwhile, to ensure a smooth and orderly process of bridge deck pavement construction, it is suggested that the Dynamic Control Method of Construction Quality be adopted during the construction of asphalt concrete deck pavement.