Analysis of Nonlinear Statical Properties of Reinforced Concrete Slabs

摘要

Two different calculation models are given for the slab element; these have a concrete model, a reinforcement model, a compatibility model of strains between concrete and reinforcing bars, and dowel action model of reinforcing bars. In the first slab element model, the concrete is layered and treated in biaxial stress state. In the other behavior model, the concrete model is triaxial. In other respects, the calculation models are close to each other. Here, the slab element under consideration means a cubic slab of unit side length. The finite-element methods treated here are the mixed method and the displacement method. As concerns the mixed method, the paper presents a model based upon the interpolation function of forces of the first degree, and the interpolation function of displacements of the second degree. Observations are made on the convergence of the mixed method, based upon test calculations and theoretical examination. A solution model, based upon isoparametric elements and Gauss' numerical integration, is presented as regards the displacement method.