SHORT-TERM DEFLECTION OF BEAMS: A NEW APPROACH TO CALCULATION

Typical load-deflection curves of a simply supported reinforced concrete beam are presented, and the author refers to existing methods used for calculating the short-term deflection of a cracked beam which fall broadly under two categories (a) the use of an effective moment of inertia and (b) the idealisation of the moment-deflection curve. References are given to authors who have compared the accuracy of the various methods, with the general conclusion that most methods predict deflections reasonably well, with the calculated values differing from the measured values by not more than 20 per cent in almost all cases. The behaviour of the beam once the cracking moment has been exceeded is discussed by reference to the physical representation of what is happening as illustrated in graphical form. The author then presents proposals for a new approach to the calculation of deflection, whereby the total deflection of A beam is obtained from the sum of two components (a) elastic deflection and (b) irrecoverable deflections. /TRRL/

  • Availability:
  • Corporate Authors:

    Cement and Concrete Association

    52 Grosvenor Gardens
    London SW1W 0AQ,   England 
  • Authors:
    • Mohamedbhai, GTG
  • Publication Date: 1976-3

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 33-4
  • Serial:
    • CONCRETE
    • Volume: 10 N
    • Issue Number: 3
    • Publisher: THE CONCRETE SOCIETY
    • ISSN: 0010-5317

Subject/Index Terms

Filing Info

  • Accession Number: 00137532
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 6 1976 12:00AM