SHEAR DESIGN FOR PRESTRESSED CONCRETE BRIDGES

The article summarises the code provisions for the shear design of standard components of prestressed concrete bridges, isolates the cases not covered by the codes and suggests ways of dealing with them. Three separate categories of shear failure are discussed. They are (1) web shear, (2) flexure shear and (3) compression failure. The factors not catered by the codes discussed in the article are (1) crack widths under design loads, (2) fatigue, (3) continuous prestressed concrete beams, (4) large beams (5) moving loads, (6) longitudinal reinforcing, (7) composite beams and (8) torsion. The following criteria for the shear design are recommended: (1) maximum shear stress should not exceed 725 pounds per square inch for closely spaced stirrups; (2) web reinforcement if mild steel should be not less than 0.25 per cent of web area; (3) contribution from draped prestressing should be neglected if section is cracked in flexure; (4) principal tensile stress under repetitive loading should not be more than 100 pounds per square inch. /TRRL/

  • Availability:
  • Corporate Authors:

    Technical Publications Limited

    C.P.O. 3047
    Wellington,   New Zealand 
  • Authors:
    • CORMACK, L G
  • Publication Date: 1974

Language

  • English

Media Info

  • Features: Figures; References;
  • Pagination: p. 25-29
  • Serial:
    • NEW ZEALAND ENGINEERING
    • Volume: 29
    • Issue Number: 1
    • Publisher: Institution of Professional Engineers New Zealand
    • ISSN: 0028-808X

Subject/Index Terms

Filing Info

  • Accession Number: 00263992
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jan 9 1975 12:00AM