Reliability-based design criteria for timber bridges in Ontario
作者:
Andrzej S. Nowak,
Raymond J. Taylor,
期刊:
Canadian Journal of Civil Engineering
(NRC Available online 1986)
卷期:
Volume 13,
issue 1
页码: 1-7
ISSN:0315-1468
年代: 1986
DOI:10.1139/l86-001
出版商: NRC Research Press
数据来源: NRC
摘要:
The new Ontario Highway Bridge Design Code (OHBDC) is based on limit states theory and therefore uses a load and resistance factor format. This paper deals with the development of the basis for the timber bridge design provisions (OHBDC). Three structural systems are considered: sawn timber stringers, laminated nailed decks, and prestressed laminated decks. The latter system has been successfully used in Ontario for the last 7 years.The acceptance criterion in calculation of load and resistance factors is structural reliability. It is required that bridges designed using the new code must have a reliability equal to or greater than a preselected target value. Reliability is measured in terms of the reliability index. The safety analysis is performed for a structural system rather than for individual members. The live load model was developed on the basis of available truck survey data. Material properties are based on extensive in-grade test results. Numerical examples are included to demonstrate the presented approach.Key words: bridge deck, design code, prestressed timber, reliability, reliability index, stringers, structural safety, timber bridges.
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