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Abstract
A rational method of design for the thickness of concrete runways and taxiways against the fatigue mode of distress is presented. The material properties used for design are the tensile strength, the fracture toughness, the Young's modulus, Poisson's ratio and the lower threshold stress intensity factor corresponding to the endurance limit. A new method of stress analysis comprising the use of mutilayered Elastic theory combined with Fracture Mechanics (EFM) is used to determine the stresses in the jointed pavements caused by the gear loads and by thermal curl stress. The effect of the combined thermal and aircraft gear load stresses including the lateral wander of the gear loads is handled rationally. The stresses are then used to compute the fatigue life, using fracture mechanics, for several concrete thicknesses, from which the final design for 500,000 applications of Boeing 777 loading is selected.