Abstract: The deflection of dowel bar will cause stress concentration on airport cement concrete pavement, and it is easier to damage the load transfer structure of pavement. In order to solve this problem, a finite element model of deflection of dowel bar on airport cement concrete pavement is established, and the stress concentration law of concrete under various deflection conditions with temperature shrinkage and aircraft load is analyzed. Simulation results show that when temperature contraction happens, the maximum principal stress increases approximately linearly with the increase of the seam width, and the greater the deflection angle, the bigger the growth rate. Under the action of aircraft load, the influence of horizontal deflection of dowel bar on the stress concentration of the wrapped concrete can be ignored, but the influence is obvious in the case of vertical deflection, especially in the case of opposite deflection of twin bars, the stress change degree is the largest and the working condition is the most unfavorable. Through the test, the finite element results of the deflection of a single dowel bar are verified. The verification results show that under the load, the bearing capacity of the structure is greatly reduced when the exposed part of the dowel bar turns away from the direction of the load action point. It is suggested that measures be taken in the construction to ensure that the dowel bar does not have vertical deflection.

Key words: airport pavement, dowel bar misalignment, numerical simulation, temperature contraction, airplane load