密布横梁体系钢桁架桥正交异性钢桥面板疲劳性能分析OA

A fatigue performance analysis is conducted on four typical fatigue details of the orthotropic steel bridge deck in a lower chord dense crossbeam system steel truss bridge,using ANSYS Workbench software and in accordance with the require-ments of fatigue load model Ⅲ.It is found that the fatigue strengths of all typical fatigue details in the orthotropic steel bridge deck meet the code specifications.However,the U-rib butt welds are identified as being more prone to fatigue dam-age compared to other details,and thus this detail is regarded as the critical control point for fatigue-resistant design in such structures.In the absence of special constraints,it is recommended that the U-rib butt welds in the dense crossbeam sys-tem be placed within the L/4 range(where L is the spacing between crossbeams)on both sides of the crossbeams,and as close to the crossbeams as possible,provided that sufficient space for welding operations is ensured.