This publication presents an overview of the information necessary to become acquainted with timber bridges. Chapter One, Timber Bridges - Part and Types, reviews the names for the basic elements of a timber bridge, and describes the major kinds of timber bridges being built today. Chapter Two, Types of Wood Construction Materials, lists the major wood-based building materials used in timber bridges and describes the composition of the more complex wood construction materials. Chapter Three, Wood as a Building Material, covers two topics in detail - the design values associated with the structural properties of wood, and the considerations associated with moisture content, apart from decay. In particular, the shrinkage potential of wood is discussed. Chapter Four, Design Standards Associated with Timber Bridges, gives a summary of the primary standards associated with the design and construction of timber bridges, and of the bodies that promulgate those standards. Chapter Five, Lumber Grading, covers in greater details aspects of the grading process relating to solid-sawn lumber. Among the topics included are the roles of the Grade-Rule Writing Agencies, of the Quality Assurance Agencies, and of the American Lumber Standards Committee. Chapter Six, Native Lumber, talks about the use of native lumber in timber bridges, including difficulties and supporting programs. Chapter Seven, Preservative Treatment of Wood, overviews the issues relating to decay, and details the treatment processes that can be used to prevent decay. The individual treatment processes are described. Chapter Eight, Additional Bridge Elements, gives information on the materials used to surface timber bridge roadways, and on guardrail elements and metal hardware items. Chapter Nine, Financial Considerations, discusses cost elements related to timber bridges, and specific funding options. Chapter Ten, Useful Lumber Information, is a listing of several tips about wood that might be useful to designers and builders. Chapter Eleven, Steps in Choosing to Build a Timber Bridge, provides an outline of the steps involved in designing, building and maintaining a timber bridge. Following the chapters, three case studies of timber bridges are included, followed by a list of useful references and the facsimile sheets of the American Lumber Standard Committee.

  • Corporate Authors:

    University of New Hampshire, Durham

    Cooperative Extension
    Durham, NH  United States  03824

    US Forest Service

    1400 Independence Avemue, SW
    Washington, DC  United States  20250
  • Authors:
    • Donnelly, C
  • Publication Date: 1997-6


  • English

Media Info

  • Features: Figures; Photos; References;
  • Pagination: 64 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00962854
  • Record Type: Publication
  • Report/Paper Numbers: 2nd Printing
  • Files: TRIS
  • Created Date: Sep 12 2003 12:00AM