CONTRIBUTION TO THE STUDY OF LOSS OF PRESTRESS THROUGH COMBINED CREEP-RELAXATION IN PRESTRESSED CONCRETE MEMBERS

CONTRIBUTION A L'ETUDE DE LA PERTE DE PRECONTRAINTE PAR FLUAGE-RELAXATION COMBINES DANS LES ELEMENTS EN BETON PRECONTRAINT.

THE METHOD OF COMUMLATION OF LOSSES CAUSED BY THE SHRINKAGE AND CREEP OF CONCRETE AND STEEL RELAXATION, WHICH IS USED IN PRESENT TECHNICAL SPECIFICATIONS TO DETERMINE THE TOTAL DIFFERED LOSS OF PRESTRESS, LEADS TO AN OVERESTIMATION OF THE LATTER. THE APPLICATION OF RHEOLOGY TO THE STUDY OF THIS PROBLEM PERMITS A REDUCTION IN THIS OVERESTIMATION. DETAILS ARE GIVEN OF A NEW TYPE OF EXPERIMENTAL EQUIPMENT DESIGNED TO CONTROL PURE CREEP PHENOMENA IN CONCRETE, PURE RELAXATION PHENOMENA IN STEEL, AND COMBINED CREEP-RELAXATION PHENOMENA. THE RESULTS PRESENTED HERE CONCERN (1) THE INFLUENCE OF THE INITIAL STRESSES IN CONCRETE AND STEEL AND THE RELATION BETWEEN THESE STRESSES AND THE EVOLUTION OF OF THE STATE OF STRESS IN AND DEFORMATION OF MATERIALS IN THE PRESTRESSED MEMBER, (2) THE EVALUATION OF THE OVERESTIMATION OF LOSS OF PRESTRESS CALCULATED BY MEANS THE METHOD OF LOSS CIRCULATION, AND (3) THE COMPARISON BETWEEN PURE CREEP AND RELAXATION PHENOMENA (CONSTANT IMPOSED STRESS AND DEFORMATION) AND COMBINED CREEP AND RELAXATION PHENOMENA (VARIABLE STRESS AND DEFORMATION). A COMPARISON IS MADE BETWEEN THEORETICAL AND EXPERIMENTAL RESULTS.

  • Corporate Authors:

    Revue Ae l'Industrie Minerale

    19 rue du Grand Moulin
    St-Etienne (Loire),   France 

    Revue de L'Industrie Minerale

    19 rue des Grands Moulins
    F-42 St Etienne,   France 
  • Authors:
    • Ataliah, R
  • Publication Date: 1972-6-15

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00081682
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Feb 27 1975 12:00AM