Sawn Lumber in Bridge Constructionby Kenneth A. Johnson, Wheeler Consolidated Inc, United States,
Abstract: This paper covers many aspects of design and construction that affect the specifications of the sawn wood components of a highway bridge. The relationships between the grading rules for lumber, National Design Specifications For Wood Construction and AASHTO Standard Specifications for Highway Bridges are examined. The factors that influence the properties and performance of sawn timber as a structural material for highway bridges are divided into two areas: (1) those factors that are controlled by, or result from, the production of the material, (2) those factors that are determined by the manner in which the member is used in the structure and the environment in which that use takes place. The economic impacts of the selection of species, marketing grade, and other decisions made by the engineer in the design of timber bridges are illustrated.
Subject Headings: Infrastructure construction | Wood bridges | Highway bridges | Bridge design | Wood construction | Highway and road design | Wood | Material properties
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