A Theory for the Shear Behaviour of Cracks Providing a Basis for the Assessment of Cracked Reinforced Concrete Structures

A rational crack behaviour model capable of predicting and assessing the response of cracks in reinforced concrete (RC) elements subjected to complex stress states is presented. The model, referred to as Pure Mechanics Crack Model (PMCM), is formulated and developed in terms of first principles, namely equilibrium, compatibility and stress strain relationships and employs few empirical parameters. Instrumental in the development of the analytical model were the data collected from an extensive experimental campaign conducted as part of the research work. Eighteen pre-cracked RC panel elements were tested under combinations of cyclic or reversed cyclic shear and tension with the objective of investigating the shear behaviour of cracks in reinforced concrete elements. The data from the testing program were used to develop and verify the PMCM, and to extend the database available from the literature which is currently limited to pure shear tests. The results provided information regarding the mechanics involved in the shear response of cracks and demonstrated that rational models of such systems can be achieved.

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