FATIGUE STRENGTH OF HIGH-YIELD REINFORCING BARS
THE FATIGUE STRENGTH OF REINFORCING BARS IS ONE OF THE KEY DETERMINANTS OF THE LIFE OF REINFORCED CONCRETE BRIDGE MEMBERS. DATA OBTAINED ON ASTM A 432 STEEL BARS (60,000 PSI YIELD STRENGTH) INCLUDED EFFECTS OF STRESS RANGE, MINIMUM STRESS (INCLUDING REVERSAL), BAR DIAMETER, TYPE OF SPECIMEN, AND GRADE OF STEEL. FATIGUE TESTS WERE CARRIED OUT ON CONCRETE BEAMS, EACH CONTAINING A SINGLE, STRAIGHT DEFORMED BAR AS THE AMIN REINFORCING ELEMENT. FINDINGS INCLUDE THE FOLLOWING: (1) REINFORCING BARS HAVE A PRACTICAL FATIGUE LIMIT; (2) STRESS RANGE WAS THE PREDOMINATE VARIABLE IN THE FINITE LIFE REGION, ACCOUNTING FOR 75% OF THE VARIATION N LIFE; (3) MINIMUM STRESS LEVEL, GRADE OF BAR AND BAR SIZE WERE STATISTICALLY SIGNIFICANT; (4) ALL FATIGUE FRACTURES ORIGINATED AT THE BASE OF A LUG; (5) DESIGN PROVISIONS HOULD BE BASED ON STRESS RANGE AND MINIMUM STRESS LEVEL, NOT ON BAR SIZE OR GRADE. A DESIGN SPECIFICATION IS SUGGESTED.
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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.
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Authors:
- Hanson, J M
- Somes, N F
- Helgason, T
- Corley, W G
- Hognestad, E
- Publication Date: 1971-4
Media Info
- Media Type: Digital/other
- Pagination: 4 p.
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Serial:
- NCHRP Research Results Digest
- Issue Number: 30
- Publisher: Transportation Research Board
Subject/Index Terms
- TRT Terms: Bars (Building materials); Fatigue (Mechanics); Fatigue tests; High strength steel; Reinforced concrete bridges; Reinforcing steel; Specifications; Strength of materials; Stresses
- Subject Areas: Geotechnology; Highways; Materials;
Filing Info
- Accession Number: 00217085
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Jun 29 1971 12:00AM