LOAD TESTING OF NO-JOINT CAST-IN-PLACE CONCRETE PIPE

THE CITY OF PHOENIX, CITY ENGINEERS OFFICE, DURING THE SUMMER OF 1961 DREW UP A RESEARCH PROGRAM OF LOAD TESTING OF CAST-IN-PLACE CONCRETE PIPE, USING SR-4 STRAIN GAGES. A 48-IN. CAST-IN-PLACE NO-JOINT PIPE WAS INSTALLED UNDER USUAL FIELD CONDITIONS AND CLOSE INSPECTION, USING SPECIFICATIONS OF THE BUREAU OF RECLAMATION AND OF THE CITY OF PHOENIX. THE INSTALLATION WAS DIVIDED INTO FOUR 25-FT TEST SECTIONS, WHICH WERE TESTED IN TURN UNDER 24, 18, 12, AND 6 IN. OF COMPACTED GRANULAR BACKFILL. LOADS WERE APPLIED AS STATIC AXLE LOADS, VARYING FROM 10,000 TO 36,000 LB. STRAINS WERE OBSERVED, ALONG WITH CHANGES IN DIAMETER, CHANGES IN ELEVATION OF THE PIPE, AND SOIL PRESSURES. VISUAL OBSERVATIONS INDICATED NO DISTRESS TO THE PIPE UNDER THE MOST EXTREME LOADING CONDITIONS. CHANGES IN HORIZONTAL AND VERTICAL DIAMETER WERE NEGLIGIBLE, AND THERE WAS NO APPRECIABLE SETTLEMENT OF THE PIPE. BY A SERIES OF TESTS ON THE CONCRETE, ATTEMPTS WERE MADE TO ESTABLISH STRESS-STRAIN RELATIONSHIPS IN THE CONCRETE USED. RESULTS OBTAINED WERE NOT CONCLUSIVE BUT INTERESTING DATA WERE OBTAINED. FURTHER WORK OF THIS TYPE IS NEEDED TO ESTABLISH RELATIONSHIPS BETWEEN OBSERVED STRAINS AND STRESSES IN THE CONCRETE AND THE THEORIES OF STRUCTURAL DESIGN AND ANALYSIS FOR PIPE OF THIS SORT. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1963/30/30-002.pdf
• Supplemental Notes:
  • 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:
  • Johnson, A Morgan
  • Hess, John D
• Publication Date: 1963

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 20-40
• Monograph Title: Culverts and slope protection
• Serial:
  • Highway Research Record
  • Issue Number: 30
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Altitude; Axle load force; Backfilling; Cast in place structures; Compaction; Concrete pipe; Deformation curve; Earth pressure; Field tests; Granular materials; Load tests; Pipe; Strain (Mechanics); Strain gages; Test sections
• Uncontrolled Terms: Change; Elevation
• Geographic Terms: Phoenix (Arizona)
• Old TRIS Terms: Backfills; Strains
• Subject Areas: Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00203922
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Oct 7 1994 12:00AM