New aluminum decks cut loads, add life

Article Abstract:

Many bridges on the list of physically obsolete bridges can be renovated using aluminum decks. The renovations cut dead load and increase the permissible vehicle weight substantially. The technique, which involves replacement of existing steel panels by prefabricated aluminum deck panels, is both cost and time efficient. Testing of the redecked bridge is done by measuring the impact of cyclic and static loading in the field and laboratory. This technique has been put to use at the Corbin Bridge, near Altoona, Pa., and at a bridge at Buffalo Creek in Virginia.

Usage, Materials, Dynamic testing (Materials), Plates, Aluminum, Aluminum plate

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All decked out

Article Abstract:

New York, NY-based engineering firm Steinman Boynton Gronquist and Birdsall conducted a state-of-the-art evaluation of Williamsburg Bridge in New York City. Results of the study led to proposals to replace the old deck with a novel steel orthotropic deck mounted to the floor girders. The system improves the load-carrying capability of the bridge because of their lightweight and ability to combine with the superstructure. It also minimizes corrosion and increases the economic life span of the bride because of the lesser number of joints required.

Innovations, Decks (Architecture, Domestic), Decks (Architecture), Williamsburg Bridge

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Grand gusset failure

Article Abstract:

The 850 ft arched truss bridge over Grand River in Cleveland underwent a midair repair scheme because the bridge's thick gusset plates were damaged. The repair was conducted by attaching jacking brackets to the lower chords of the failed joint and to strain gauge members. The strain gauge members were realigned through post-tensioning so that partial replacement gussets could be positioned. Although the repair of the damaged part of the bridge was complicated, it was completed in five-months time.

Bridges, Truss, Truss bridges

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