Abstract
The Yukon River Bridge, a two-span truss bridge on the Alaska Highway, was damaged by a traffic accident in January 1982. This paper describes the actions taken to repair and strengthen the damaged structure. Highlighted in the paper is the repair of a fractured bottom chord, which opened up 2 in. (50.8 mm) after the accident. Field measurements of member forces taken during the repair operation and at proof load tests carried out after the repairs are presented. Structural responses obtained from theoretical computer analyses are compared with the field-measured values. Results of physical and chemical laboratory tests performed on samples of the bridge steel are reported, and lessons learned from the project are discussed. Key words: truss, bridge, steel, concrete, repair, strengthening, brittleness, stress, measurement, jacking, restoration, fracture, traffic, accident, damage.
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