DEFLECTION AND STRAINS IN BURIED FRP PIPES SUBJECTED TO VARIOUS INSTALLATION CONDITIONS

The primary objective of this research was to define more precisely the performance of fiberglass-reinforced plastic (FRP) pipe in relation to load-induced strains and deflections. Effects due to soil density, pipe stiffness, soil type, and installation techniques are discussed. An electronic device that describes the deflected profile of the buried pipe was used in such a way that bending strains were determined from changes in radii at 1-degree increments around the circumference of the buried pipe. The bending strains as determined by this profilometer have been found to correlate well with bending strains determined by strain-gauge measurements. The strain and deflection responses to certain installation irregularities for pipes with various stiffnesses have been monitored and documented. An installation in which a select material is placed around the pipe for up to 70 percent of the outside diameter and native material is placed above that point has been investigated. Heights of cover should be limited for these installations. The effect of neglecting soil placement in the haunch areas of the pipe has been investigated and reported. Proper haunching has been found to be a very important influence on strain levels in buried flexible pipes. Techniques used in this study are applicable to pipe materials other than FRP. Also, specific results can be applied to other pipe materials with similar stiffnesses.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1985/1008/1008-015.pdf
• Record URL:
  • https://scholar.google.com/scholar_lookup?title=DEFLECTION+AND+STRAINS+IN+BURIED+FRP+PIPES+SUBJECTED+TO+VARIOUS+INSTALLATION+CONDITIONS&author=A.+Moser&author=R.+BISHOP&author=O.+Shupe&author=D.+Bair&publication_year=1985
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• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Culverts and Hydraulic 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
• Authors:
  • Moser, A P
  • Bishop, Ronald R
  • Shupe, O K
  • Bair, D R
• Publication Date: 1985

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 109-116
• Monograph Title: Culverts: analysis of soil culvert interaction and design
• Serial:
  • Transportation Research Record
  • Issue Number: 1008
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Bending; Deflection; Fiberglass; Material reinforcement; Pipe; Strain (Mechanics); Underground structures
• Uncontrolled Terms: Cover depth
• Old TRIS Terms: Strains
• Subject Areas: Bridges and other structures; Design; Environment; Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00459553
• Record Type: Publication
• ISBN: 0309038189
• Files: TRIS, TRB
• Created Date: Nov 30 1986 12:00AM