NON-LINEAR EFFECT ON FLEXURAL STIFFNESS OF REINFORCED CONCRETE RECTANGULAR SECTIONS

Document Type : Original Article

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Civil Eng. Dept. Modern Academy for Engineering and Technology

Abstract

The load-deformation characteristics of flexural members are very important in designing reinforced concrete structures. In most cases the dimensions of structural elements are governed by the allowable deflections to comply with the serviceability limit state provisions. Flexural rigidity represents a governing factor in the member deflection calculation. Due to cracking and the non-linear behavior of concrete, the flexural rigidity changes during loading history. Most current Codes recommend using the concept of equivalent moment of inertia and concrete elastic modulus for calculating immediate deflections. The aims of this research are: investigating the load-deformation characteristics taking into account the non-linear behavior of concrete; and introducing a simple method for estimating the flexural rigidity of reinforced concrete rectangular sections. A parametric study is carried out on groups of rectangular reinforced concrete sections for checking its flexural rigidity. Using regression analysis on the results of parametric study, empirical formula for estimating flexural rigidity is obtained. Also, a mathematical approach and design-aids charts are prepared for evaluating the flexural rigidity. Comparison of the results obtained using the proposed techniques with the nonlinear analysis results shows good agreement.

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