基于结构应力法的碳钢焊接结构疲劳评估OACSTPCD

The service safety and service life of welded structures have always been concerned.The Master S-N curve estab-lished on the basis of fracture mechanics is suitable for the anti-fatigue design of steel welded structures with different types of joints.In this paper,the fatigue properties of orthotropic bridge decks,T-joints,plate and tube-plate welded structures are evaluated based on the mesh-insensitive structural stress method.In the process of fatigue assessment,the effects of welding deformation,weld size and residual stress on complex welding structures are quantitatively analyzed,and the fatigue data are modified with angular deformation and average stress as correction coefficients respectively.The results show that the fa-tigue data of orthotropic bridge deck,T-joint considering angular deformation,plate and tube-plate structure considering the effect of residual stress are all within a 95%confidence interval of Master S-N curve.It is proved that Master S-N curve is the preferred curve for anti-fatigue design of welded structures.