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Publication Information

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Title: Overview of the National Timber Bridge Inspection Study

Author: Wacker, James P.; Brashaw, Brian K.; Jalinoos, Frank;

Date: 2013

Source: USDA Forest Service, Forest Products Laboratory, General Technical Report, FPL-GTR-226. pp. 610-615.

Publication Series: Full Proceedings

Description: As many engineers begin to implement life cycle cost analyses within the preliminary bridge design phase, there is a significant need for more reliable data on the expected service life of highway bridges. Many claims are being made about the expected longevity of concrete and steel bridges, but few are based on actual performance data. Because engineers are least familiar with timber bridges, their expected longevity is often unfairly estimated at only 25-30 years. A national scale project has been developed for the United States, led by the USDA Forest Products Laboratory and the U.S. Federal Highway Administration. In this project, a group of 6 bridge inspection teams, representing the major climate zone types in the U.S., each inspected at least 20 timber bridges. Nondestructive inspection techniques included visual, probing, sounding, stress wave, and resistance micro-drilling. The study results will help to provide a better understanding of the design, performance, and durability characteristics of timber bridge structures. This paper will highlight the overall inspection findings, which were instrumental in reliably estimating the expected service life for timber bridge superstructures and help support future designs that employ life cycle and sustainable features.

Keywords: bridge, inspection, nondestructive evaluation, service life, durability, condition

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

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Citation:


Wacker, James P.; Brashaw, Brian K.; Jalinoos, Frank 2013. Overview of the National Timber Bridge Inspection Study. In: USDA Forest Service, Forest Products Laboratory, General Technical Report, FPL-GTR-226. pp. 610-615.

 


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