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The calculation accuracy of stess intensity factor K has direct effect to the results when elastic fracture mechanics is adopted to fatigue life estimation. In order to decrease calculation errors, the steel I-beam with side crack and the steel box beam with central crack have been studied which are commonly used in bridge engineering, and the stress intensity factors of crack ends are calculated based on finite element method, and the results are compared with simplified formula calculating values. The conclusions have been achieved that comparative errors are obvious using empirical formulas when boundary conditions are different, and the fitting formula of shape functions are obtained based on the finite element data.

The Research on Stress Intensity Factor of Steel Bridge Members Based on Finite Element Method