This paper presents the results of an investigation of flexural cracking and failure by fatigue in bonded, post- tensioned concrete I beams; the results of the corresponding static cracking and static failure tests are also described. The effect of repeated loading on the bond factor, steel stresses, deformations and crack patterns is reported as is the effect of a prior history of repeated loading on the subsequent based series of tests to obtain the fatigue strength in air of the prestressing strand are reported, and this fatigue strength is compared to that obtained for the strand when in the beam; reduction s, in fatigue strength stress range, of the order of 40% are reported for the embedded steel. Finally, a theory, based on the fatigue fracture of the reinforcement, is presented for the prediction of the fatigue strength of prestressed concrete members in flexure. This theory applies to repeated loading between extremes that are of constant magnitude; it is not considered that the state of knowledge at the moment warrants extension to repeated loading of variable magnitude.

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 205-226
  • Serial:
    • Volume: 47

Subject/Index Terms

Filing Info

  • Accession Number: 00081050
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Mar 26 1975 12:00AM