United States Department of Transportation
i
Assessment and evaluation of timber piles used in Nebraska for retrofit and rating.
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2014-04-01
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[PDF-3.70 MB]
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Abstract:The cost of an effective retrofitting and rehabilitation of timber piles is less than cost of replacing the piles. However, some of the retrofit options used in Nebraska failed to result in the expected performance levels. Further, design and detailing of different retrofit schemes are not well defined. Therefore, the objective of this project was to develop a set of guidelines to retrofit damaged timber piles.
Different types of damages, methods of assessment, and repair procedures of the timber piles were reviewed. Few repair methods were selected for detail investigation. Five full scale timber pile specimens with different level of damages were prepared. The damage in each specimen was repaired by using FRP wrap to capsulate the damaged region and filling it with either resin or grout or resin and gravel. Guidelines are provided carry out the repair of timber piles in field using the selected repair methods. Ultimate load tests were carried out on the specimens to evaluate the effectiveness of the repair methods.
Test results show that grout is more effective in repairing large cavity-type damages compared to resin. Resin might be more effective for repairing cracks and small cavities in timber piles. Further, the failure load of the repaired pile specimens was at least five times greater than the design load capacity of the timber pile.
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