A beam-rotational spring model is presented for nonlinear analysis of reinforced concrete structures subjected to monotonically increased or reversed static loading. A beam or frame is treated as an assembly of beam elements. Each beam element has a bilinear hysteretic rotary spring at each end. The beam elements are assumed to remain elastic in bending along their length, but may undergo inelastic bilinear hysteretic axial deformation. A computer program nlacf (nonlinear analysis of concrete frame) based on the proposed model has been developed in FORTRAN IV language. The use of the program to predict the load-deformation and ultimate strength of reinforced concrete structures is illustrated by application to a simply supported reinforced concrete beam and three reinforced concrete frames. Comparison of the results with the results reported by other investigators indicates that the ultimate strength of a reinforced beam or frame can be accurately predicted by the proposed beam-rotational spring model, maximum discrepancy being of the order of 3%. It is concluded that the proposed model provides a simple but accurate analytical tool for predicting ultimate strengths of reinforced concrete structures. (a) (TRRL)

  • Availability:
  • Corporate Authors:

    Institution of Structural Engineers

    11 Upper Belgrave Street
    London,   United Kingdom  SW1X 8BH
  • Authors:
    • Seniwongse, M
  • Publication Date: 1979-12

Media Info

  • Features: Figures; References;
  • Pagination: p. 77-81
  • Serial:
    • Structural Engineer
    • Volume: 57B
    • Issue Number: 4
    • Publisher: Institution of Structural Engineers
    • ISSN: 1466-5123

Subject/Index Terms

Filing Info

  • Accession Number: 00310267
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Oct 27 1980 12:00AM