SHEAR BEHAVIOR OF PRETENSIONED HIGH-STRENGTH CONCRETE BRIDGE I-GIRDERS

Because of the optimization of I-girder shapes for maximum flexural efficiency and increasing use of high-strength concrete, shear strength control of member design is becoming more common. The American Association of State Highway and Transportation Officials (AASHTO) Standard Specifications require that the nominal shear resistance of section considered not exceed 8 times the square root of the compressive strength of concrete at service (f' sub c) times the product of width of the web (b sub w) and distance from extreme compressive fiber to centroid of prestressing force (d). If not, the section web must be widened or the depth increased. On the other hand, AASHTO Load and Resistance Factor Design (LRFD) Specifications require a maximum shear limit of 0.25(f' sub c)(b sub w) time the effective shear depth (d sub v). The difference between the two limits may be as high as 100%. The purpose of this research is to theoretically and experimentally establish a limit on shear capacity before member size must be increased. Full-scale experiments have shown that the limit on shear capacity specified in the LRFD Specifications can be reached. A key factor is anchorage of the longitudinal flexural reinforcement at the member end.

• Record URL:
  http://www.concrete.org/Publications/InternationalConcreteAbstractsPortal.aspx.aspx?m=details&i=848
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846957
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Ma, Zhuanglin
  • Tadros, M K
  • Baishya, M
• Publication Date: 2000-1

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 185-192
• Serial:
  • ACI Structural Journal
  • Volume: 97
  • Issue Number: 1
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-3241
  • Serial URL: http://www.concrete.org/PUBS/JOURNALS/SJHOME.ASP

Subject/Index Terms

• TRT Terms: Anchorages; Cracking; Experiments; Flexure; Girder bridges; Girders; High strength concrete; I beams; Load and resistance factor design; Longitudinal reinforcement; Pretensioning; Reinforcing steel; Shear properties; Shear strength; Specifications; Steel wire fabrics; Stirrups; Strain (Mechanics)
• 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: 00789061
• Record Type: Publication
• Contract Numbers: CMS-9640570
• Files: TRIS
• Created Date: Mar 29 2000 12:00AM