MODELLING TIME DEPENDENT DEFORMATIONS IN REINFORCED CONCRETE FLEXURAL MEMBERS. RESEARCH REPORT

Most methods which have been developed for calculation of the time dependent deformation of reinforced concrete beams and slabs are directed towards prediction of final values for design purposes. Where the analysis of the interaction of contiguous members of differing ages is to be done (eg, progressive bridge construction), a method that can give periodic prediction is needed. This paper describes a method of this type. The reinforced concrete section is treated as a set of elements with the stress and strain history of each being progressively calculated and recorded for the separate but concurrent actions of shrinkage and bending. These are incremental shrinkage strains, with their simultaneous relaxation and stress adjustments, and bending stresses and strains which have similar adjustments. A good fit of calculated values to data is obtained. The computer program is used to give plotted values for a range of concrete characteristics, reinforcement and loading. These illustrate the effect of variations in these parameters. The significance of this is discussed and the important characteristics for deflection control identified (A).

  • Corporate Authors:

    University of Queensland

    Department of Civil Engineering
    Brisbane, Queensland  Australia  4072
  • Authors:
    • McAdam, P S
    • Behan, J E
  • Publication Date: 1988-4

Language

  • English

Media Info

  • Pagination: 55 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00606263
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: CE86
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1991 12:00AM