00459578

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http://onlinepubs.trb.org...trr/1986/1053/1053-009.pdf

https://scholar.google.co...akis&publication_year=1986

Because nearly one-half of the bridges in the United States are listed as either functionally or structurally deficient lends impetus to search for new ideas for building and maintaining bridges. Most of these bridges are on secondary and rural roads where spans are short, which makes timber a prime candidate for construction. The Forest Service, U.S. Department of Agriculture, with a vast number of bridges under its care, is cooperating with the University of Wisconsin to investigate new techniques for timber bridge design and construction. Described in this paper are promising new ideas, which are being examined for bridge construction, rehabilitation, and production of efficient performance and low cost in timber bridge systems. The scope of the research covers reviewing recent advancements in bridge design, applying new techniques to enhance the performance of common bridge types, and evaluating totally new structural configurations for use in bridges. The performance enhancement may be achieved by increasing the transverse spread of load through distributor beams, prestressing techniques, and dowels. New structural configurations include plane trusses, multileaf trusses, and composite beams assembled together to produce parallel chord longitudinal deck systems. The research involves theoretical evaluations to estimate span capabilities. The more promising concepts, which are based on structural potential, estimated cost, and simplicity, are being experimentally tested to verify models, theory, and design procedures.

This paper appeared in Transportation Research Record N1053, Timber Bridges. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01419458

pp 59-65

1986

Transportation Research Record

030903969X

Print

Figures (4) ; References (12)

Bridge design; Bridges; Construction management; Development; Dowels (Fasteners); Driver rehabilitation; Maintenance; Prestressing; Research; Structural design; Wooden bridges

Bridge maintenance; Rehabilitation; Research and development

Bridges and other structures; Construction; Design; Highways; Maintenance and Preservation; Research; I24: Design of Bridges and Retaining Walls

TRIS, TRB

Nov 30 1986 12:00AM

• A PREFABRICATED MODULAR TIMBER BRIDGE
• AN OVERVIEW OF TIMBER BRIDGES
• DESIGNING TIMBER BRIDGES FOR LONG LIFE
• LATERAL STABILITY CONSIDERATIONS OF TIMBER BEAMS IN OLD BRIDGES
• LOAD DISTRIBUTION CRITERIA FOR GLUED-LAMINATED LONGITUDINAL TIMBER DECK HIGHWAY BRIDGES
• OHIO'S EXPERIENCES WITH TREATED TIMBER FOR BRIDGE CONSTRUCTION
• PERFORMANCE AND REHABILITATION OF TIMBER BRIDGES
• PROBABILISTIC ASSESSMENT OF THE FAILURE OF LAMINATED TIMBER BRIDGES
• REPAIR OF TIMBER BRIDGE PILING BY POSTING AND EPOXY GROUTING
• ULTIMATE STRENGTH OF TIMBER-DECK BRIDGES