The Wood-Armer equations are used extensively in the design of reinforced concrete slabs, but their direct application to assessment can lead to a conservative estimate of structural capacity. This paper derives equations, which are based on the same fundamental principles, but provide a more precise estimate of the ability of a given slab to withstand an imposed field of moments. In many cases, the application of these equations will lead to an improved assessment for bridges, which were previously analysed using the Wood-Armer equations and found to require a load restriction. Thus the new method allows many structures to be assessed as safe, which would have been considered unsafe after an analysis using the Wood-Armer equations. The new method assumes that the reinforcement arrangement is already known. It provides a systematic approach to assess whether a reinforced concrete slab has sufficient capacity to withstand an imposed loading, quantified by determining the factor of safety on that loading. Assessments are made for: (1) positive reinforcement; (2) negative reinforcement; and (3) under dead and live loading. Two worked examples of slab assessment calculations are included.

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  • Corporate Authors:

    Institution of Structural Engineers

    11 Upper Belgrave Street
    London,   United Kingdom  SW1X 8BH
  • Authors:
    • DENTON, S R
    • Burgoyne, C J
  • Publication Date: 1996-5-7


  • English

Media Info

  • Features: References;
  • Pagination: p. 147-52
  • Serial:
    • Structural Engineer
    • Volume: 74
    • Issue Number: 9
    • Publisher: Institution of Structural Engineers
    • ISSN: 1466-5123

Subject/Index Terms

Filing Info

  • Accession Number: 00725489
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Sep 26 1996 12:00AM