An effective compliance matrix C tilde is proposed to model the behaviour of concrete based on phenomenological evidences and physical insight. Three parameters alpha, beta and gamma were introduced in the effective compliance matrix C tilde. alpha and beta are introduced to model the different behaviour of concrete in tension and compression while the third parameter gamma was introduced to account for volumetric change. The predictive capability of the proposed elasto-damage model for uniaxial and multiaxial stress path was investigated for uniaxial compression, biaxial compression and uniaxial tension. The predicted results correlate well with the available experimental data. The simulative capability of the model to capture the phenomenological behaviour of volumetric dilatation is reflected. Also, the ability of the model to predict multiaxial response of concrete is reflected through biaxial strength interaction envelope which compares very well with the experimental results.

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