Fatigue Tests of Overlapping Details for Orthotropic Steel Bridge Decks and Transverse Beams of Stay Cables

Abstract

Rail-cum-road cable-stayed bridge with single cable plane is eccentric under moving load, overlapping details for orthotropic steel bridge decks and transverse beams of stay cables are in typical complex space stress condition. A fatigue test is performed to evaluate anti-fatigue performance of overlapping details under the combination of highway and light railway loads. A 1:1 model is adopted for the overlapping details, where a fatigue loading test for 2×106 cycles is carried out. Its test results show: the structural stress level is low, no crack is found on the test model after cyclic loading for 2×106 cycles, then load amplitude is gradually increased and no crack is found after cyclic loading for 4.25×106 cycles, finally a result is obtained that no fatigue crack will be found on the overlapping details for orthotropic steel bridge decks and transverse beams of stay cables within design life, because fatigue strength requirements are satisfied.