Title:
A New Simplified Model for Nonlinear RC Slabs Analysis
Author(s):
Michael A. Reitman and David Z. Yankelevsky
Publication:
Structural Journal
Volume:
94
Issue:
4
Appears on pages(s):
399-408
Keywords:
beam analogy; complex loading; finite elements; nonlinear analysis;
representative grid; stress-strain diagrams;
DOI:
10.14359/491
Date:
7/1/1997
Abstract:
A new technique for nonlinear analysis of reinforced concrete (RC) slabs under various loading programs is developed. The technique is based on nonlinear finite element (FE) analysis of a grid representing the slab. An original formulation for the representative grid allows a good quality of the representation for the most coarse mesh of the grid axes. A refined nonlinear FE model of a RC frame under complex loading was used. The model is based on a new modification of spatial anisotropic beam finite element and refined constitutive models of concrete and steel-in-concrete under complex loading history. The developed simplified method is capable of predicting nonlinear behavior up to the failure for various RC slabs subjected to monotonic and complex loading (including unloading and reloading branches). Slabs with different boundary conditions, geometry, reinforcement, and material properties can be analyzed. Membrane action and influence of nonideal boundary conditions are treated. Analytical results for various RC slabs tested by different investigators under different programs show a good agreement with the experimentally observed data.