Based on the parent metal fatigue S-N curve arc incision performance evaluation

The floorbeam cutout of orthotropic steel deck (OSD) is a typical fatigue detail. There are a series of problems in evaluating fatigue performance based on nominal stress method and hot spot stress method. Therefore, the S-N curve based on the base metal is used to evaluate the fatigue performance directly. In order to evaluate the fatigue performance of the floorbeam cutout, a multi-scale model of OSD structure is established, and the floorbeam cutout is selected as the focus. The most disadvantageous working conditions of the floorbeam cutout under transverse and longitudinal loading are analyzed to obtain the stress distribution at the floorbeam cutout. Finally, nominal stress method, hot spot stress method and S-N curve of base metal were used to evaluate the fatigue performance of floorbeam cutout. The results show that nominal stress location has a great influence on fatigue performance evaluation. Using hot spot stress method to evaluate fatigue performance at floorbeam cutout lead to great difference in calculation due to the choice of hot spot stress curve. Fatigue evaluation method based on S-N curve of base material can evaluate fatigue performance of this place very well. This method provides a new idea for fatigue assessment of OSD structures.