oa Civil Engineer in South Africa - Simplified modelling of material non-linearity in structural frames : technical paper

Volume 30, Issue 9
  • ISSN : 0009-7845



A simplified procedure is described for modelling the effects of material non-linearity in elastic-plastic-stability problems in framed structures. An equivalent bilinear moment-curvature relationship is assessed by subdividing the cross-section into the minimum number of rectangular elements or concentrated areas required to reflect the dimensions of the section and different materials. These representative relationships are determined before commencing the structural analysis and enable a typical member in a frame to be represented by one three-noded element. The method is illustrated by examples of a reinforced concrete frame and continuous composite beams in which the different materials are represented by realistic stress-strain curves with strain-weakening or strain-hardening properties.

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