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- W111305118 abstract "This paper presents a model of crack formation and propagation in a reinforced concrete beam section. The model is aimed at understanding the nonlinear behaviour of cracked RC beams at residual deformation, which is important for structural health monitoring. The loading momentrotation curve is developed using a fictitious crack model and Cornelissen’s constitutive relationship for concrete. For unloading, a new bi-linear constitutive relationship is applied, in which the initial stiffness is defined by a focal point in the elastic compression region. The material is then assumed to achieve its initial modulus of elasticity either when the crack closes or the stress becomes compressive. The degree of nonlinearity at residual rotation is quantified by the curvature of the unloading moment-rotation curve at zero moment. The sensitivity of the degree of nonlinearity to damage level, crack height and focal point location is investigated. It is found that the nonlinearity is sensitive to both the location of the focal point and the level of damage, but the trend of changes in the nonlinearity with damage levels is similar for each focal point. It is also observed that the nonlinearity increases with the level of damage up to about 30% of the failure load and then decreases with further damage, which is consistent with previously reported experimental data." @default.
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- W111305118 date "2010-06-30" @default.
- W111305118 modified "2023-09-26" @default.
- W111305118 title "Modelling the nonlinear behaviour of a cracked reinforced concrete beam" @default.
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