00459587

Component

http://onlinepubs.trb.org...trr/1986/1053/1053-004.pdf

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

Contained in this paper is a discussion on the procedures for evaluating the ultimate strength of timber deck bridges. Three structural systems are considered: sawed timber stringers, nailed laminated decks, and prestressed laminated decks. The load and resistance are treated as random variables. Their parameters are determined on the basis of material tests, load surveys, and analysis. The bridge performance is measured in terms of the reliability index. Various safety analysis methods are discussed. The procedures used in calculations were selected on the basis of accuracy, requirements for input data, and simplicity of use. System reliability models were used to include load sharing between deck components. Reliability indices were calculated for three structures. It has been observed that the degree of load sharing determines the safety level. Reliability is highest for the prestressed laminates. Sawed stringers can be considered as a series system in the system-reliability sense, with a rather limited redundancy. Therefore, the corresponding reliability indices are relatively low. Prestressed timber structures are recommended. The major advantages are a better load distribution, a better control of wood deterioration, and a relatively low cost of application.

Publication of this paper sponsored by Committee on Low-Volume Roads. 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 26-30

1986

Transportation Research Record

030903969X

Print

Figures (4) ; References (13) ; Tables (3)

Alternatives analysis; Laminated wood; Load transfer; Nails; Reliability; Stringers; Timber construction; Ultimate strength; Wood; Wooden bridges

Bridges and other structures; Design; Highways; 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
• NEW IDEAS FOR TIMBER 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