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Madison, WI 53726-2398
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Title: Timber Bridges: Design, Construction, Inspection, and Maintenance Chapter 05: Basic Timber Design Concepts for Bridges

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

Author(s)Ritter, Michael A.

Publication Year: 1990  View PDF »

Related Publications: view

Category: US Forest Service Publication

Abstract: For thousands of years, timber bridges and other timber structures were built primarily by trial and error and rule of thumb. Designs were based on past experience, and little concern was given to efficient material usage or economy. As the complexity of structures increased, more attention was focused on the importance of accurate engineering methods. Research was undertaken to develop design criteria for wood with the same level of accuracy and reliability available for other engineering materials. As a result, developments in timber design have advanced substantially in this century. Although wood is orthotropic and differs in many respects from other materials, wood structures are designed using many of the same equations of mechanics developed for isotropic materials. Variations in material properties from growth characteristics, manufacturing, and use conditions are compensated for by material grading and stress adjustments applied in the design process. Timber design may seem confusing at first, but with experience it is no more difficult than design with other materials.

Keywords: Beams;Specifications;Species;Design;Timber; the timber bridge manual;

File size: 2,002 kb(s)

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

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