n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Failure interaction curves for combined loading involving torsion, bending, and axial loading : technical paper




Many modern concrete structures such as elevated guideways are subjected to combined bending, torsion, shear and axial loading. Designing such structures, using the limit state approach, requires an understanding of the behaviour of structural concrete under combined loading and a capability to determine failure interaction curves. In this paper the compression field theory, which is based on commonly accepted assumptions that have been successfully used to predict flexural and torsional response, is used to predict failure interaction curves for reinforced rectangular sections. A computer solution using MATLAB with its excellent in-built graphics capabilities enabled the plotting of the failure interaction curves that are shown to be in good agreement with test results.


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