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The crack spacing of reinforced concrete structures has a major influence on structural performance. The fracture energy criterion of crack formation was employed to predict the crack spacing of concrete based on the linear elastic fracture mechanics. This method employs analytical derivation of three dimensional axisymmetric elastic mechanics problems. The simplified solution for a direct tension specimen with a single rebar at the center is derived and both the fracture mechanics criterion as well as the strength criterion are put forward to predict the crack spacing of reinforced concrete members. The influence of concrete strength to the crack spacing is also well explained by this method. Data analysis of classical test results implies a proof for employing fracture mechanics criterion instead of the strength criterion.

Fracture Energy Method in Predicting Crack Spacing of Reinforced Concrete Structures