United States Department of Transportation
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Abstract:The proposed structure over the Thompson River on Highway 200 in Montana demanded a high level of performance from the foundations elements. During the design process multiple foundation options were investigated. Drilled shafts were chosen as the preferred foundation type for the bridge due to site constraints, load demand, available capacity, and seismic concerns. During construction of the new bridge, a sacrificial test shaft was installed for conducting a static load test. The static load test was conducted using Osterberg Load Cell (O-Cell) technology and procedures. The data obtained by the successful load test allowed the Pier 2 shaft design lengths to be shortened. The reduction in drilled shaft length offset the cost for the installation and execution of the O-Cell test. Approximately $64,000 was saved based on the unit bid prices for the project. This document includes information regarding the load test as well as example contract documents for future projects where O-Cell testing is a consideration.
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[PDF-117.30 MB]
