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In this thesis, full bond between steel bar and concrete is assumed, moreover, concrete material non-linearities are attributed to cracking and/or cru ...展开
shing. A loading-rate independent constitutive model, proposed by Z. Lin and M. Raoof for plane concrete subjected to general state of biaxial loading, is used. The stress-strain curve of reinforcing steel is modelled by an idealized elastic-perfectly plastic curve identical in tension and compression. Cracking or crushing occurs once the Kupfer-Gerstle failure envelope is violated. Different models are founded to deal with concrete behavior after cracking, othogonal cracking , crack closure and crushing. Finally, a non-linear finite strip program Strip2D is presented. 收起
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