FATIGUE STRENGTH OF HOT ROLLED DEFORMED REINFORCING BARS

FATIGUE TESTS ON #5, 8, AND 10 REINFORCING BARS (16, 25, AND 32 MM DIAMETER, RESPECTIVELY) WITH NOMINAL YIELD STRENGTHS OF 40, 60 AND 75 KSI (2800, 4200, AND 5300 KGF/CM SQUARED) ARE REPORTED. TESTS WERE CARRIED OUT ON REINFORCED CONCRETE BEAMS CONTAINING ONE SUCH BAR AND ON SPECIMENS MACHINED FROM THE BARS. ALTHOUGH THE FATIGUE STRENGTH OF THE MACHINED SPECIMENS VARIED DIRECTLY AS THE ULTIMATE TENSILE STRENGTH OF THE BARS, THE FATIGUE STRENGTHS OF THE BARS THEMSELVES WERE ESSENTIALLY CONSTANT AND EQUAL TO 30 KSI (2100 KGF/CM SQUARED) FOR A ZERO TO MAXIMUM TENSION CYCLE. IT IS SUGGESTED THAT THIS MAY BE CAUSED BY THE DECARBURIZED OUTER SURFACE OF THE BARS AND STRESS CONCENTRATIONS AT THE BASE OF THE DEFORMATIONS. /AUTHOR/

• Supplemental Notes:
  • Vol 68, No 3, PP 169-179, 8 FIG, 6 TAB, 15 REF
• Authors:
  • MacGregor, J G
  • Jhamb, I C
  • Nuttal, N
• Publication Date: 1971-3

Media Info

• Serial:
  • Am Concrete Inst Journal & Proceedings

Subject/Index Terms

• TRT Terms: Beams; Deformed bars; Fatigue (Mechanics); Fatigue tests; Reinforced concrete; Repeated loads; Strength of materials; Tensile strength
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209403
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 22 1971 12:00AM