PRESTRESS LOSSES DUE TO THE EFFECT OF SHRINKAGE AND CREEP ON NONTENSIONED STEEL

COMPARATIVE TESTS ON FOUR TYPES OF BEAMS ALL HAVING THE SAME INITIAL PRESTRESSING FORCE WERE CONDUCTED. ALL FOUR TYPES WERE OF ABOUT THE SAME ULTIMATE RESISTANCE, BUT HAD DIFFERENT AMOUNTS OF NONTENSIONED STEEL IN THE RATIOS 1 :2.68 :4. :5.22. THE EFFECTIVE PRESTRESS WITH MAXIMUM AMOUNT OF NONTENSIONED STEEL WAS ONLY 60 PERCENT OF THAT WITH MINIMUM AMOUNT OF NONTENSIONED STEEL. BASED ON THE GOOD AGREEMENT BETWEEN MEASUREMENTS AND CEBFIP FORMULAS, THE LOSSES WERE EVALUATED FOR HUMIDITIES BETWEEN 50 PERCENT AND 100 PERCENT FOR THE FOUR TYPES OF BEAMS OF DIFFERENT PERCENTAGES OF NONTENSIONED STEEL, WHICH INDICATES THAT THE PRESTRESSING LOSSES AT INFINITY INCREASE SUBSTANTIALLY WITH REDUCED HUMIDITY AND ENLARGED PERCENTAGE OF NONTENSIONED REINFORCEMENT.

  • Authors:
    • Kung, R
    • Abeles, P W
  • Publication Date: 1973-1

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Filing Info

  • Accession Number: 00209859
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 30 1973 12:00AM