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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
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Title: Timber Bridges: Design, Construction, Inspection, and Maintenance Chapter 13: Bridge Inspection for Decay and Other Deterioration

Source: United States Department of Agriculture, Forest Service, Washington, DC.

Author(s)Ritter, Michael A.;Morrell, Jeffrey J.

Publication Year: 1990  View PDF »

Related Publications: view

Category: US Forest Service Publication

Abstract: Wood is an amazing combination of polymers that exhibits both strength and durability as a structural material. Nevertheless, from the time it is formed in the tree, wood is subject to deterioration by a variety of agents. Damage ranges from relatively minor discolorations caused by fungi or chemicals to more serious decay and insect attack. Wood degradation is beneficial in the ecosystem, returning carbon and other elements to the soil and air, but it becomes detrimental when the deteriorating material is part of a bridge or other structure. Wood outperforms most other materials when used in a properly designed and maintained structure; however, when used in adverse environments, it must be protected to ensure adequate performance. Although the use of pressure-treated wood has signiflcantly extended the life of timber, decay is still the primary cause of bridge deterioration.

Keywords: Timber;Wood deterioration;Fungi;Insects;Lamination;Bridge; the timber bridge manual;

File size: 1,166 kb(s)

Date posted: 06/02/2009
Current FPL Scientist associated with this product
Ritter, Michael A.
Assistant Director
  

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