Analysis Of The Mechanical Behavior Of Crack Distresses Of Asphalt Concrete Pavement For Cement Concrete Bridge

When a path is spanning small barriers, engineers always choose reinforced concrete bridges as small and medium-sized bridges, because its cost of construction is inexpensive and the construction technology is easy. Among all the designs of reinforced concrete bridges, the design theory of T-beam bridge is the most mature, so the T-Beam bridge is the capital type of small and medium-sized bridge of highways and municipal roads. The research of this paper is based on a T-Beam bridge in Jiangbei District of Harbin, and analyzed the reasons of crack distresses of asphalt concrete pavement. What is more,this paper also has carried on numerical simulation about the asphalt concrete pavement, which is working with some typical crack distresses. Depending on the theory of Fracture mechanics, this paper has analyzed the mechanical behavior of crack distresses of asphalt concrete pavement, which include temperature stress, load stress and the additional stress caused by the non-uniform settlement of each main beam. Finally, this paper has analyzed the Influence of stress of pavement caused by the change of thickness and modulus of elasticity, and the sensitivity of stress of the asphalt concrete pavement.The results prove that:after the appearing of crack distresses, there is stress redistribution at the crack tip, and the stress intensity factor is Shearing type, which is Influenced by thickness and modulus of elasticity, but the Influence of modulus of elasticity is non-significant; additional stress caused by the non-uniform settlement of each main beam is most Sensitive to the thickness of cement concrete layer.