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Assessment of the residual fatigue strength in RC beams

Sain, T and Kishen, JM Chandra (2007) Assessment of the residual fatigue strength in RC beams. In: 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures, JUN 17-22, 2007, Catania, ITALY.

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Abstract

In conventional analysis and design procedures of reinforced concrete structures, the ability of concrete to resist tension is neglected. Under cyclic loading, the tension-softening behavior of concrete influences its residual strength and subsequent crack propagation. The stability and the residual strength of a cracked reinforced concrete member under fatigue loading, depends on a number of factors such as, reinforcement ratio, specimen size, grade of concrete, and the fracture properties, and also on the tension-softening behavior of concrete. In the present work, a method is proposed to assess the residual strength of a reinforced concrete member subjected to cyclic loading. The crack extension resistance based approach is used for determining the condition for unstable crack propagation. Three different idealization of tension softening models are considered to study the effect of post-peak response of concrete. The effect of reinforcement is modeled as a closing force counteracting the effect of crack opening produced by the external moment. The effect of reinforcement percentage and specimen size on the failure of reinforced beams is studied. Finally, the residual strength of the beams are computed by including the softening behavior of concrete.

Item Type: Conference Proceedings
Additional Information: Copyright of this article belongs to Taylore and Francis.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 08 Mar 2010 09:00
Last Modified: 08 Mar 2010 09:00
URI: http://eprints.iisc.ernet.in/id/eprint/26003

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