Johnson's Crossing, Yukon, Canada

Bild und Text von Buckland & Taylor Ltd.

Description:;The two lane steel deck truss bridge is the second longest bridge on the Alaska Highway which runs for more than 1000 miles through British Columbia, Yukon and Alaska. ;Total Length including Approach spans: 447 m (1466 ft );Main Span: 79 m (259 ft);Owner and Client:;Yukon Territorial Government;Scope of Work:;This riveted structure was studied by Buckland & Taylor Ltd. in 1991 as part of an evaluation of 31 bridges in Yukon Territory, and the evaluation included a review of its seismic capacity. The evaluation techniques used were state-of-the-art and were prepared by Buckland & Taylor Ltd. for insertion into the Canadian Bridge Code.;In 1992, the company was retained to do a more detailed study with a view to replacing and widening the deck (thus adding mass) and bringing the bridge up to modern seismic standards.;Once again the company's computer program, CAMIL, was used for static and dynamic analysis and it was concluded that the bridge can be brought up to modern standards.;In late 1994, the company was commissioned to provide plans and specifications for widening of the deck, increasing the traffic load carrying capacity and providing full seismic retrofit.

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