THE DESIGN TO RESIST BENDING OF LIGHTWEIGHT REINFORCED CONCRETE

BIEGEBEMESSUNG VON STAHLLEICHTBETON

There is a divergence of opinion concerning the behaviour under load of reinforced lightweight concrete. This does not provide uniformity in safety or economy. It is the aim of appropriate research to remedy this unsatisfactory state of affairs. The experiences gathered with normal weight concrete can however serve as a basis. One of the main tasks in the determination of the stress distribution in the compression zone at failure, because the results obtained for normal weight concrete cannot be applied because of the lower strengths of the lightweight aggregates. In contrast to normal concrete the stress-strain curve of lightweight concrete is flatter and lightweight concrete is more brittle. Research dealt with three concretes of high to medium strength having various compositions. Because of the unreliability of beam bending tests the stress distribution in the compression zone was determined by means of prism tests. It was found that the stress distribution for long term loading gave the lowest ultimate load. An idealised stress distribution in the compression zone was derived from the results of the prism tests. Two suggestions-a parabolic/rectangular and a triangle/rectangle distribution gave good approximations to the test results. Both types of stress distribution have both advantages and disadvantages. These proposals must be supplemented by further information such as safety factors and strain behaviour. /TRRL/

  • Corporate Authors:

    Deutscher Beton-Verein E.V.

    Bahnhofstrasse 61, Postfach 543
    Wiesbaden,   Germany 
  • Authors:
    • Grasser, E
  • Publication Date: 1976

Language

  • German

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 345-363
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00300977
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Oct 17 1979 12:00AM