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South Dakota Department of Transportation
Project Synopsis
SD1992-14


Title: Monitoring of the Spearfish Timber Bridge
Project Researcher: Jon Becker, South Dakota Department of Transportation
Project Manager: Dave Huft
Research Period: -
Status:
Cost: $0.00

Problem Statement:Timber structures can be functional, aesthetically pleasing, and economical. However, engineers require additional information on design, construction, and maintenance of timber bridges. In recognition of this fact, the Intermodal Surface Transportation Efficiency Act of 1991 includes a discretionary timber bridge construction and research program.

The City of Spearfish has decided to construct a 65 ft single span stressed cellular box structure over Spearfish Creek. Because this structure will be the first of its type on the Federal-Aid system, the Federal Highway Administration requires that it be considered an experimental construction feature, and that the project be included in the National Experimental and Evaluation Program. FHWA has determined that this structures performance must be monitored for a period of five years following construction.

Information needed to assess the structures performance includes moisture content of the timber members, retention of prestressing tension, corrosion, wood deterioration, deflection, and performance under load.

Findings:
Title: Monitoring of the Spearfish Timber Bridge
Project Researcher: Jon Becker, DOT
Project Manager: Dave Huft
Research Period: -
Status:
Cost: $0.00

Problem Statement:Timber structures can be functional, aesthetically pleasing, and economical. However, engineers require additional information on design, construction, and maintenance of timber bridges. In recognition of this fact, the Intermodal Surface Transportation Efficiency Act of 1991 includes a discretionary timber bridge construction and research program.

The City of Spearfish has decided to construct a 65 ft single span stressed cellular box structure over Spearfish Creek. Because this structure will be the first of its type on the Federal-Aid system, the Federal Highway Administration requires that it be considered an experimental construction feature, and that the project be included in the National Experimental and Evaluation Program. FHWA has determined that this structures performance must be monitored for a period of five years following construction.

Information needed to assess the structures performance includes moisture content of the timber members, retention of prestressing tension, corrosion, wood deterioration, deflection, and performance under load.

Findings:

Research Objectives:
1  To monitor and document the construction of a stressed cellular box structure.
2  To monitor the performance of the structure for five years after construction.
3  To demonstrate instrumentation and inspection methods for monitoring timber bridge performance.

Research Tasks:
1  To provide load cells and moisture meter for installation on the structure.
2  To provide technical assistance during installation of instrumentation.
3  To conduct three load tests of the structure.
4  To conduct visual inspections of the bridge deck during site visits.
5  To prepare and publish a report on the bridge's construction, performance, and maintenance requirements.

Documents Available:

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