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EFFECTIVE STIFFNESS MODEL FOR REINFORCED CONCRETE SLABS

Maria Anna Polak STIFFNESS REINFORCED CONCRETE SLAB STIFFNESS MODEL EFFECTIVE STIFFNESS MODEL

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ارسالی 17 July 2017 - 07:49 PM

EFFECTIVE STIFFNESS MODEL FOR REINFORCED CONCRETE SLABS
By Maria Anna Polakl
ABSTRACT: A simple procedure for calculating deflections of reinforced concrete two-way slabs is presented
in this paper. The material model for reinforced concrete based on the effective stiffness approach has been
implemented in a finite-element program incorporating Mindlin-plate-bending elements. Uncracked concrete is
treated as an isotropic linear elastic material, and after cracking, the concrete is considered to be an orthotropic
material. The reduced stiffness coefficients after cracking are calculated from the effective moments of inertia
in the x- and y-directions. These effective moments of inertia are determined using the formula proposed by
Branson (1963). The influence of both bending and torsional moments is included in the formulation. The
proposed model has been verified by comparisons with results from tests on slabs with various loading and
boundary conditions. A study has also been undertaken to check the sensitivity of the proposed formulation
when applied to the analysis of slabs with different reinforcement ratios, boundary conditions, and reinforcement
orientations.

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