THE DEVELOPMENT OF LINKED STARTER BARS

A programme is described to test an interlocking bar system, developed as an alternative to rebending the starter bars in reinforced concrete as marketed by Square Grip. A series of links and interlocking bars, bent to shape code 39 are presented in a disposable polyurethene plank, which can be simply fixed to the face of the shuttering. After removing the shuttering and plastic plank, half of the linked bars are rotated into line and the connection subsequently encapsulated in concrete often at the intersection of two walls or a slab and wall. The main area of interest in the tests was the performance in direct tension. Initial cracking of the joint was found to be largely dependent on the quality of the concrete used and the preparation of the surfaces. The ultimate load carried is directly related to the area of reinforcing steel providing the links. The joint appears to function effectively after the appearance of a hair-line crack which largely disappears after the load is removed. Although the load-carrying capacity of the joint is good, deformation can be large. A design approach based on the results of the tests is outlined. (TRRL)

  • Availability:
  • Corporate Authors:

    Plenum Publishing Corporation

    233 Spring Street
    New York, NY  United States  10013
  • Authors:
    • Wade, D H
    • Clapson, J D
  • Publication Date: 1984-9

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: p. 16-19
  • Serial:
    • CONCRETE
    • Volume: 18
    • Issue Number: 9
    • Publisher: THE CONCRETE SOCIETY
    • ISSN: 0010-5317

Subject/Index Terms

Filing Info

  • Accession Number: 00394583
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jul 31 1985 12:00AM