FRETTING FATIGUE IN POST-TENSIONED CONCRETE BEAMS
This paper summarizes an experimental study of the fatigue strength of post-tensioned concrete girders with bonded tendons. The test series included strand-in-air tests to characterize the prestressing strand used, reduced beam specimens with single-strand tendons and multiple-strand tendons, and complete beams with multiple-strand tendons. The variables explored included the effect of stress range, type of duct material, lateral contact force per unit length, and type of strand. Duct materials included both metallic and plastic sheaths. Both epoxy-coated and uncoated strands were used. All specimens were tested in a cracked condition. Fatigue failures occurred in regions of large curvature in the vicinity of cracks. The results reveal that the expected fatigue life of prestressing strands as determined from strand-in-air tests can be substantially reduced in post-tensioned concrete applications due to fretting fatigue of the prestressing tendon. With metal ducts, the rubbing between sheath and strand greatly aggravated fretting. Plastic ducts showed marked evidence of rubbing and wear, but with single-strand tendons, fretting was not a serious problem. However, with plastic ducts and multiple strands in more than one layer, fretting occurred between layers of strands and reduced fatigue life. Design recommendations based on these and other tests are presented.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/13846957
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Corporate Authors:
P.O. Box 19150, Redford Station, 22400 Seven Mile Road
Detroit, MI United States 48219 -
Authors:
- Wollmann, G P
- Yates, D L
- Breen, J E
- KREGER, M E
- Publication Date: 1996-3
Language
- English
Media Info
- Features: Figures; References; Tables;
- Pagination: p. 172-179
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Serial:
- ACI Structural Journal
- Volume: 93
- Issue Number: 2
- Publisher: American Concrete Institute (ACI)
- ISSN: 0889-3241
- Serial URL: http://www.concrete.org/PUBS/JOURNALS/SJHOME.ASP
Subject/Index Terms
- TRT Terms: Beams; Concrete; Experiments; Fatigue tests; Girders; Posttensioning; Prestressed concrete; Prestressing; Steel
- Uncontrolled Terms: Concrete beams; Prestressing strands
- Old TRIS Terms: Prestressed steels
- Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 00720439
- Record Type: Publication
- Files: TRIS
- Created Date: Apr 24 1996 12:00AM