High-Strength Self-Consolidating Concrete Girders Subjected to Elevated Compressive Fiber Stresses, Part 1: Prestress Loss and Camber Behavior

Design of prestressed concrete members is restricted by the requirement that extreme compressive fiber stress at midspan of simply supported members be less than 60% of the concrete compressive strength at release of prestressing. The purported purpose of this limit is to address serviceability performance, but it places unnecessary limits on the capability of the materials. For this research program, 6 prestressed concrete girders were produced with high-strength self-consolidating concrete and subjected to comprehensive fiber stress levels ranging from 65-84% of the concrete compressive strength at release of prestressing. Time-dependent concrete surface strains were measured using a mechanical strain gauge, with a focus on measuring drying creep and determining its relationship to prestress losses. This research demonstrates that current American Association of State Highway and Transportation Officials load and resistance factor design prestress-loss prediction methods developed for high-strength concrete overestimate losses by 18%, whereas older methods for prestress losses developed for normal-strength concrete produced more accurate results. Based on these results and work performed by others, the authors concur with increasing the allowable compressive stress limit at any location to 70% of the concrete compressive strength at release of prestressing.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/12789822
• Authors:
  • Brewe, Jared E
  • Myers, John J
• Publication Date: 2010

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 59-77
• Serial:
  • PCI Journal
  • Volume: 55
  • Issue Number: 4
  • Publisher: Precast/Prestressed Concrete Institute
  • ISSN: 0887-9672
  • Serial URL: http://www.pci.org

Subject/Index Terms

• TRT Terms: Compressive strength; Curvature; Girders; High strength concrete; Load and resistance factor design; Prestressed concrete; Prestressing; Self compacting concrete; Strength of materials; Structural design; Structural members
• Identifier Terms: American Association of State Highway and Transportation Officials
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01336998
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 18 2011 12:24PM