PhD Theses

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Browsing PhD Theses by Subject "Buckling behaviour"

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    Effect of plastification on the buckling behaviour of non-linear structural two-dimensional reinforced concrete frames
    (University of Dar es Salaam, 2005) Salim, Wanjala Ramadhan
    This Thesis deals with non-linear finite element analysis of structural 2-D reinforced concrete frames. It explores the effect of progressive material failure due to flexural actions on axial load carrying capacity of the frame. A plane stress field is assumed to describe the behaviour of frame members. The thesis proposes a new finite beam-column element that takes into consideration non-linear geometrical and material response. The non-linear incremental formulation is based on the Principle of Virtual Work. The equilibrium equations are derived using the Updated Lagrange Formulation. The material behaviour of concrete is described by failure surface described by Kupfer/Tusuji et al. The modified model of Hognestad is used for the concrete stress- strain relation. The material behaviour of rebar is described by Von Mises yield criterion while the stress-strain relation is modelled as bilinear elastic work hardening plastic material. Typical structures have been analyzed and results presented. The results show that consideration of plastification in a 2-D reinforced concrete frame, when the effect of cracking is taken into account, leads to a lower axial load carrying capacity of the structure. Thus the study results show that the effects of plastification on axial load carrying capacity of structures are important and should always be included in finite element models for predicting response of reinforced concrete members.