This paper compares the more commonly used design rules for compression laps in reinforced concrete columns with the results of research carried out recently at the University of Glasgow. The research showed that both end-bearing and bond contribute to the total strength of the joint and that these both exert bursting forces on the surrounding concrete. The strength of the concrete, the area of the ribs and the amount and arrangement of the links are all found to have an effect on the required lap length. A review of existing codes of practice shows wide differences in requirements and some, including the current British code, do not appear to provide the same factor of safety as is required in other aspects of design. Suggestions are given for improvements in detailing which could rectify this situation. /Author/TRRL/

  • Availability:
  • Corporate Authors:

    Institution of Structural Engineers

    11 Upper Belgrave Street
    London,   United Kingdom  SW1X 8BH
  • Authors:
    • Arthur, P D
    • Cairns, J W
  • Publication Date: 1978-3

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 9-19
  • Serial:
    • Structural Engineer
    • Volume: 56B
    • Issue Number: 1
    • Publisher: Institution of Structural Engineers
    • ISSN: 1466-5123

Subject/Index Terms

Filing Info

  • Accession Number: 00179186
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 27 1978 12:00AM