Authors:Asad-ur-Rehman Khan,Tatheer Zahra,
Keywords:Multiaxial stresses,Elasto-damage modeling,Confinement,Damage accumulation,Proportionate loading, Non-proportionate loading,
AbstractThis study focuses on the improvement of predictive capabilities of elasto-damage model, initially proposed by Khan et al., for concrete subjected to multiaxial state of stress. The critical energy release rate 𝑅𝑐, which was initially assumed constant, is defined as a function of 𝑓𝑐′, and 𝐸𝑜 in the present study. Parameters 𝛼,𝛽 and 𝛾 used in effective compliance matrix, are redefined for the proposed form of 𝑅𝑐 by regressing against available experimental data to obtain better estimates. The computer code for implementing the model is modified such that it is able to predict the response of concrete under both proportionate and non-proportionate loadings. The predictive capability of model to simulate stress-strain response of concrete subjected to multiaxial stresses and confining pressures is shown to have improved. The model is able to predict essential phenomenological behavior of concrete which relate well with the experimental results.
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