REPORT OF COMMITTEE ON THE USE OF HIGH ELASTIC STEEL AS REINFORCEMENT FOR CONCRETE. CHAPTER XII. DISTRIBUTION OF BOND IN LONG PULL-OUT SPECIMENS

THREE DUPLICATE SERIES OF PULL-OUT TESTS WERE CONDUCTED ON SPECIAL ALLOY STEEL PLAIN BARS (YIELD STRENGTH ABOUT 175,000 P.S.I.) 1/4-IN. AND 1/2-IN. DIAMETERS FOR L/D RATIOS 12 TO 96 (EMBEDMENTS FROM 3 TO 48 IN.). IN NO CASE DID STRESSES EQUAL AS MUCH AS ONE-HALF THE YIELD STRENGTH OF THE STEEL. THESE TESTS WERE TO DETERMINE THE ACTUAL DISTRIBUTION OF BOND FOR SPECIMENS WITH LONG EMBEDMENTS BUT FOR WHICH YIELD POINT (OR YIELD STRENGTH) STRESSES WERE NOT APPROACHED. IT WAS ALSO DESIRED TO ASCERTAIN WHETHER OR NOT THERE MIGHT BE SOME LIMITING LENGTH OF PLAIN BAR BEYOND WHICH ADDED LENGTH OF EMBEDMENT GAVE NO ADDED BOND RESISTANCE. SURFACE STRAINS WERE MEASURED ON THE CONCRETE FOR THE SPECIMENS OF ONE OF THE THREE SERIES AND SLIPPAGES WERE MEASURED AT BOTH THE LOADED AND THE UNLOADED ENDS OF THE BARS IN ALL CASES. DUE TO ADDED RESIDUAL DRAG WITH ADDED LENGTH OF EMBEDMENT, THERE APPEARS TO BE NO LENGTH BEYOND WHICH THE TOTAL PULL IS NOT INCREASED SLIGHTLY WITH ADDED LENGTH OF EMBEDMENT. THE RESULTS SUPPLEMENT AND CONFIRM TRENDS AND FINDINGS OF THE PREVIOUS STUDIES ON RELATED ASPECTS OF BOND AND SUPPLY ADDITIONAL BASIC INFORMATION ON THE SUBJECT. /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/20/20-028.pdf
• Supplemental Notes:
  • Vol 20, pp 498-510, 9 FIG, 1 TAB, REFS. 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:
  • Gilkey, H J
  • Chamberlin, S J
  • Beal, R W
• Publication Date: 1941

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Twentieth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 3-6, 1940
• Serial:
  • Highway Research Board Proceedings
  • Volume: 20
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Alloy steel; Anchoring; Bars (Building materials); Bonds; Deformation curve; Diameter; Length; Pull out test; Ratios; Reinforcing steel; Steel
• Old TRIS Terms: Embedments (Concrete); Pullout
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209420
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Aug 23 1971 12:00AM