The model's overall deformation performance is hardly affected by the fatigue cracks. After 5 million cycles, the measured crack lengths in these details were 130 and 45 mm, respectively. The measured tension stresses near the rib-to-deck welds and rib-to-diaphragm connections changed significantly at 2.25 and 3.0 million cycles, respectively. The stress-influenced surfaces indicate the different multi-vehicle effects for fatigue details. The stresses of symmetrical details in one U-rib are in the opposite compression and tension states due to deflection of the wide diaphragm, which is unfavourable for fatigue performance. ![]() The results demonstrate that the fatigue details near the hanger side have relatively large stresses. The nominal-stress method and linear elastic fracture mechanics (LEFM) were employed to evaluate the fatigue performance of the OSD. ![]() ![]() An equivalent full-scale fatigue test model with eight U-ribs was tested under five million load cycles. The fatigue stress characteristics and stress-influence surface of typical fatigue details of the OSD were investigated. To investigate the fatigue performance of an orthotropic steel deck (OSD 1) in a long-span highway suspension bridge with a wide steel-box girder, a finite element analysis (FEA) and a model test were conducted.
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