Abstract：To study fatigue performance of welded detail with cope hole in truss oblique rod of
Hutong railway Yangtze River Bridge girder, the fatigue test models were designed based on the
similarity theory. Three sets of specimens (total 9 specimens) were tested under fatigue loading.
The fatigue life and strain distribution of the specimens under fatigue loads with different
stress amplitudes were measured. Meanwhile the finite element analysis of test specimens were
carried out, and the FEA results were compared to the test results. The research results show that
the crack propagation and failure modes of all specimens are coincident in the fatigue test. The
FEA results agree well with the test results, and the tolerance is within 15%. The slope of the
S-N curve regressed from the fatigue tests is 1/2.66, which is different from that of the category
71 welded detail in Eurocode3. The fatigue stress amplitude of this welded detail corresponding to
the 2 million times with failure probability 2.3% is 37.89MPa.
