PARTIAL PRESTRESSING: A COMMENTARY

THE MAJOR DESIGN OBJECTIVE FOR PRESTRESSED CONCRETE STRUCTURES IS ELIMINATION OF FLEXURAL TENSILE CRACKING. WHILE THEORETICALLY APPEALING, THIS PURPOSE IS IN REALITY VITIATED BY CRACKING ATTRIBUTABLE TO SECONDARY EFFECTS (E.G., IN COMPOSITE BEAMS, AT BEAM JUNCTIONS, AND AROUND ANCHORAGES). IN PARTIAL PRESTRESSING, FLEXURAL CRACKING IS PERMITTED BUT IS CONTROLLED BY THE USE OF AUXILIARY REINFORCEMENT. IT IS, IN ESSENCE, A COMBINATION OF REINFORCED AND PRESTRESSED CONCRETE. PARTIAL PRESTRESSING IS SEEN AS AN EXTENSION OF REINFORCED CONCRETE USE THAT MOBILIZES FULLY THE STRENGTH OF HIGH YIELD STEELS. A PRESTRESS IS APPLIED TO AVOID THE LARGE DEFLECTIONS THAT WOULD OTHERWISE BE NECESSARY TO STRESS THE STEEL, YET THE LEVEL OF PRESTRESS IS NOT SO HIGH THAT SOME OF THE DISADVANTAGES INHERENT IN FULL PRESTRESSING ARE ENCOUNTERED. STRAIGHTFORWARD DESIGN METHODS FOR FLEXURAL ANALYSIS HAVE BEEN DEVELOPED AND LARGELY SUBSTANTIATED BY TESTING. MANY STRUCTURES HAVE BEEN CONSTRUCTED WITH PARTIALLY PRESTRESSED CONCRETE TO DATE AND IT IS APPARENT THAT THE SAVINGS INHERENT IN THIS DESIGN CONCEPT WILL LEAD TO ITS WIDER APPLICATION. /AUTHOR/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0028808X
• Supplemental Notes:
  • Vol 26, No 9, PP 272-276
• Authors:
  • CORMACK, L G
• Publication Date: 1971-9-15

Media Info

• Serial:
  • NEW ZEALAND ENGINEERING
  • Publisher: Institution of Professional Engineers New Zealand
  • ISSN: 0028-808X

Subject/Index Terms

• TRT Terms: Design; Prestressed concrete; Prestressing; Reinforcing steel
• Uncontrolled Terms: Partial prestressing
• Subject Areas: Design; Highways; Materials;

Filing Info

• Accession Number: 00214062
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 2 1972 12:00AM