Implementation of microplane model in analysis of RC frames

Abstract eng:
During the last decades, the finite element method has become the most powerful structural analysis tool and it allows using of more and more sophisticated material models. These describe real material very correctly, but the computational cost of an analysis with such models is overly high. Good example of this fact is concrete - one of the most widespread building materials. In this paper, authors focused on the microplane model. This model describes rather nonlinear behaviour of concrete very truly, the computational cost, however, is insofar high making wider usage in practical engineering not possible. That is why we proposed an adaptive analysis of RC concrete frames with microplane joints. Initially, a frame is composed of only beam elements with nonlinear behaviour. In the course of computation, parts which exceeded suitable criterion are replaced by three-dimensional microplane model. At the moment of collapse, the microplane model is used only in some sections of the frame (especially close to joints), so computational effort is smaller compared to frame modelled completely by 3D elements.

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