BASIC MODEL AND SIMPLIFIED CALCULATIONS OF DEFORMATIONS ACCORDING TO THE CEB-FIP MODEL CODE 1990

The principal objective of this article is to present the CEB-FIP mome nt-curvature relationship. This basic model is valid in the case of si mple bending or combined bending and takes into account the effect of reinforcement, the effect of cracking, and the time-dependent effects (creep and shrinkage). This relationship and the derived simplified me thods were essentially developed for the CEB Permanent Commission V, a nd were definitively adopted by the CEB general assembly in Paris, Sep tember, 1990, for the new Model Code CEB-FIP 1990. A parametric study is presented that shows the influence of different factors on the curv ature PSI1 in State I-noncracked, the curvature PSI2 in State 2-naked, and the mean curvature PSI(m). Also, different simplified calculation methods are presented and discussed.