Abstract
The fatigue behavior of gusset joints (plate with gusset welded on the surface) for steel structures under various environments are presented and discussed on the allowable fatigue strength at 2×106 stress cycles. Fatigue tests were performed on the specimens of three groups: exposed to air, immersed in 3% NaCl solution and alternately exposed to both. The test results obtained from exposure to air show that the fatigue strengths of corroded gusset joints were higher than those of the uncorroded ones. The fact may be explained by the effect of the increase of toe radii of fillet welds. Corrosion fatigue strengths at 2×106 stress cycles were lower than the fatigue strength of specimens exposed in air. As for the final group, the S-Nf curve fell between the two curves obtained from the two tests.
