LONGITUDINAL STRENGTH AND STIFFNESS OF CORRUGATED STEEL PIPE
Iowa, as well as other states, has experienced several failures of corrugated metal pipe (CMP) culverts, apparently because of inlet flotation. In Iowa, most of these failures have occurred on secondary roads. In a survey of Iowa county engineers, 31 CMP culvert failures occurred within a 5-year period (1983 to 1988). A survey of state departments of transportation revealed nine CMP failures within the 5 years preceding 1992. Design standards from various states for tiedowns to resist uplift showed resisting forces ranging from 44.5 kN (10 kips) to 293.7 kN (66 kips) for pipes 2.03 m (80 in.) in diameter. Data from the survey of states verified an earlier conclusion based on responses from Iowa county engineers that when end restraint is not provided, there is a potential for uplift failures. Further, standards for existing restraint systems have an unclear theoretical or experimental basis, or both. Discussed here is the initial phase of a research program at Iowa State University, where a design procedure is being developed to determine the necessity and magnitude of restraining force to prevent CMP uplift failures. Theoretical relationships were developed for predicting the longitudinal stiffness, yield moment capacity, and ultimate moment capacity of CMP. Full-scale tests of steel CMPs 1.22 m (4 ft) and 1.83 m (6 ft) in diameter experimentally determined EI factors of 2.49 MN-sq m (869 x 10 to the 6th power sq in.-lb.) and 2.61 MN-sq m (911 x 10 to the 6th power sq in.-lb), respectively (3 x 1 corrugation style). Theoretical results were 2.39 MN-sq m (832 x 10 to the 6th power sq in.-lb) and 2.83 MN-sq m (985 x 10 to the 6th power sq in.-lb) for the two pipes. The agreement of theoretical and experimental results verifies the accuracy of the theoretical relationships which will be used in the development of rational design standards.
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Supplemental Notes:
- This paper appears in Transportation Research Record No. 1514, Design and Performance of Underground Pipe. 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
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Authors:
- Havens, Brian T
- Klaiber, F Wayne
- Lohnes, Robert A
- Zachary, Loren W
- Publication Date: 1995
Language
- English
Media Info
- Features: Figures; Photos; References; Tables;
- Pagination: p. 1-9
- Monograph Title: Design and performance of underground pipe
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Serial:
- Transportation Research Record
- Issue Number: 1514
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Accuracy; Corrugated pipe; Culverts; Data collection; Design standards; Failure; Longitudinal stiffeners; Longitudinal strength; Metal pipe; Prototype tests; Restraint systems; Secondary roads; State departments of transportation; Surveys; Theory; Tiedowns; Uplift pressure
- Uncontrolled Terms: Longitudinal stiffness
- Geographic Terms: Iowa
- Old TRIS Terms: Test results; Ultimate moment capacity; Yield moment capacity
- Subject Areas: Bridges and other structures; Highways; Safety and Human Factors; I20: Design and Planning of Transport Infrastructure;
Filing Info
- Accession Number: 00715648
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Jan 25 1996 12:00AM