oa Civil Engineering = Siviele Ingenieurswese - Simplified modelling of material nonlinearity in structural frames
A simplified procedure was descriptionbed for modelling the effects of material non-linearity in elastic-plastic-stability problems in framed structures. An equivalent bilinear moment curvature relationship was 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 were determined before commencing the structural-analysis and enabled a typical member in a frame to be represented by one three-noded element. The method was illustrated by examples of a reinforced concrete frame and continuous composite beams in which the different materials were represented by realistic stress strain curves with strain-weakening or strain-hardening properties.
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