Abstract
Recent fatigue cracking on highway and railroad bridges urged the study on appropriate methods to repair and to reinforce the damaged structures. Fatigue tests were carried out on tensile plates: a) with stop-holes as crack arrester, b) with groove-welded repair at the center c) with stop-holes reinforced with high strength bolted splices, and d) with stop-holes reinforced with fillet welded splices.The stop-holes were appropriate way for a temporary crack arrester, when the cracks were small. The groove welded repair showed wide range of fatigue life depending upon the weld quality. Relatively large weld defects were observed, when the groove welds were made by an unexperienced welder on vertical position. Short fatigue life was observed on the fillet welded splices, while high strength bolted repair showed longest fatigue life after repair.
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