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Abstract

This paper presents an analytical model to predict the increase in longitudinal reinforcement tension due to shear in reinforced concrete beams. Based on a smeared truss idealization with an inclined compression chord, the model assumes that the profiles of compression chord can be represented by the simple power law of which curvature effect equilibrates a constant fraction of the shear along the span. Thereby, the sectional equilibrium and compatibility conditions are established between the forces and deformations associated with the chords and those associated with the web. The modified compression field theory is employed to evaluate the shear deformation of the web. From these equilibrium and compatibility conditions, the influence of shear on the longitudinal steel tension is determined at each cross section of a beam. The accuracy of the model is examined by comparisons with the measured values which are available in literatures. A good agreement is observed between the predicted and the measured at every loading stage in each test beam. Also the model is compared with the shift-rule in the current design codes, and the differences are discussed.

Keywords

arch action reinforced concrete beam shear compatibility steel tension truss model

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Analytical Model to Predict the Influence of Shear on Longitudinal Steel Tension in Reinforced Concrete Beams

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