00390854

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http://onlinepubs.trb.org...trr/1984/950/950v1-017.pdf

https://scholar.google.co...alsh&publication_year=1984

The transverse prestressing of wood was conceived of in 1976 as a method for rehabilitating nailed laminated wood decks. Using high-strength prestressing steel, a permanent pressure is introduced normal to the direction of the laminations to provide high interlaminate shear strength and improved load distribution. The success of this new concept in rehabilitation resulted in its becoming the subject of a major research and development program conducted by the Ontario Ministry of Transportation and Communications (MTC). The extensive work performed by MTC over the past 7 years has led to the formulation of a set of comprehensive design specifications for prestressed wood. The objective of this paper is to outline the design, construction, and load testing of the world's first new prestressed wood bridge. The bridge was designed by MTC and constructed by the Ontario Ministry of Natural Resources (MNR) over the West River, on a logging access road, near Espanola, Ontario, in 1981. The design process with reference to the new design specifications, which have since been adopted by the Ontario Highway Bridge Design Code, is discussed. The field construction is outlined highlighting the prefabrication and assembly of the prestressed wood superstructure. The load testing of the bridge in 1982 and the subsequent evaluation of the test results are described. The MNR determined that the West River bridge cost only two-thirds of the steel structure originally proposed for that site. The load testing and subsequent evaluation indicated that this prestressed wood bridge is an extremely rigid structure with considerable reserve strength.

This paper appeared in Transportation Research Record Number 950, Volume 1, Second Bridge Engineering Conference conducted by the Transportation Research Board and the Federal Highway Administration, September 24-26, 1984. Publication of this paper sponsored by Committee on General Structures. 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

01419841

pp 110-122

1984

Transportation Research Record

Bridge Engineering Conference, 2nd, 1984, Washington, DC, USA

03090036593

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Figures (18) ; Photos (5) ; References (9)

Bridge decks; Bridge design; Bridges; Construction; Driver rehabilitation; Laminated wood; Load tests; Load transfer; Prefabricated structures; Prestressing; Prototypes; Shear strength; Specifications; Steel; Strength of materials; Structural design; Wood; Wooden bridges

Rehabilitation

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

TRIS, TRB

Dec 30 1984 12:00AM