FATIGUE OF PRESTRESSING WIRES

FATIGA DE ALAMBRES DE PRETENSADO

Tests have been carried out to study the fatigue behaviour of wire used in prestressed concrete. Numerous standards are reviewed (CEB, euronorma, din, asp) for measurement of wire fatigue strength as a function of the variables: maximum or minimum stress, variation interval of stress and number of cycles as well as wire type, smooth or high bond. The majority of recommendations relating to the axial fatigue test for reinforcement have adopted the Rilem Standard. The most characteristic aspects are given as test sample, test condition, number of samples, operational method, result, accuracy. Tests carried out on two steels, an aged steel and a stabilised steel, followed the Rilem Standard. A test apparatus was constructed which did not damage the surface of the test sample, rupture occurring outside the anchorage zone. For comparison, the aged steel was tested with "slipper and clamp" commercial anchorages, rupture occurring in the anchorage zone. From the results it is deduced that the minimum stress in the cycle, within the usual range, has only a small influence on the phenomena, whereas the amplitude has a large effect. The behaviour of the two steel types is similar. The validity of linear elastic fracture theory is verified. (TRRL)

  • Corporate Authors:

    Instituto Eduardo Torroja

    Costillares, Chamartin
    Madrid 33,   Spain 
  • Authors:
    • Elices, M
    • Sanchez-galvez, V
  • Publication Date: 1977-10-12

Language

  • Spanish

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 85-99
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00311900
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: May 21 1981 12:00AM