Abstract
The tests were conducted using full-scale welded plate girders (L =6.4m, H =1.044m) with cross-beam connections in order to investigate the fatigue streng ths of various temporary repair methods for fatigue cracks and the improvement effect of repair methods for decreasing local stress in gusset joint. As the temporary repair methods, drilling stop holes, tightening H.T.B at the st op hole and patching the plate were used, and the effects of repair were confiremed by the fatigue tests. Additionally, as the improvement of fatigue strength on flange gusset and web gusset, it was studied on the reduce of stress concentration by the patching plates. As the results, the repair effect by the drilling stop hole was low, the effect of patching plate was better than another metods. And, in case of the improvement of fatigue strength by patching plate, it was confiremed that the stress was reduced by setting the H.T.B at the position of stress concentration.
