WEIGHING UP LIMIT STATE DESIGN

This article is concerned with limit state design in relation to CP110, the National Code of Practice for the Structural use of Concrete. The author first discusses, in general terms, the limit state approach to design which is based on the attainment of a condition that would make premature failure improbable. It is pointed out that it has the advantages of giving a clearer idea of the design processes, allows the ready incorporation of the findings of research work and experience and avoids major pitfalls due to the application of new techniques. An example is given involving system building. The author discusses criticisms that have been levelled at CP110, which, he believes are based partly on unfamiliarity (particularly since metrication has been involved) and partly on one or two minor details that have caused confusion. Attention is drawn to additional requirements that no individual result in the 28-day cube tests is less than 85 per cent of the specified characteristic strength and criticism is expressed of the statistical handling of the test results, which leads to increased cost. The author gives examples of how limit state design can lead to better compliance with servicability requirements. A discussion is presented of the extensions of the method to other codes, such as CP2007 and of the Nedo report on the increased cost of energy, in the light of concrete requirements; future trends in concrete technology are examined. /TRRL/

  • Availability:
  • Corporate Authors:

    IPC Building and Contract Journals Limited

    32 Southwark Bridge Road
    London SE1 9EX,   England 
  • Authors:
    • HUGHES, B
  • Publication Date: 1975-2-20

Media Info

  • Features: Photos;
  • Pagination: p. 43-45
  • Serial:
    • CONTRACT JOURNAL
    • Volume: 263
    • Issue Number: 4981
    • Publisher: Reed Business Information, Limited
    • ISSN: 0010-7859

Subject/Index Terms

Filing Info

  • Accession Number: 00125082
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 18 1975 12:00AM