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PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Micro-Plane Damage based Model for Concrete under Monotonic and Cyclic Loadings
M. Labibzadeh and S.A. Sadrnejad
Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, Iran
M. Labibzadeh, S.A. Sadrnejad, "Micro-Plane Damage based Model for Concrete under Monotonic and Cyclic Loadings", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 113, 2007. doi:10.4203/ccp.86.113
Keywords: micro-plane, damage, concrete, monotonic, cyclic.
Most of the existing concrete material models have been developed based on the experimental results from uniaxial and limitedly triaxial compressive tests on the standard cylindrical concrete specimens. These models are not able to predict the behaviour of practical concrete structures under any actual load effects in a suitable manner. This is due to the fact that many of the stress paths which may occur in a material of a real concrete structure under actual load conditions do not appear under laboratory situations.
In this study, an attempt has been made to develop a material model for plane concrete which has relatively more comprehensiveness in contrast to other existing concrete material models. To do so, the theory and experience are put together. The micro-plane and continuum damage theories are combined. Twenty-six micro-planes are considered in a material point. On each micro-plane five possible fundamental strain/stress conditions which can occur under any arbitrary load cases are assigned:
For each of the five above mentioned cases, an isotropic local damage function is assumed. These functions are been built by considering the experimental observations obtained from reported failure tests on concrete specimens at scientific literatures.
Model formulations and obtained numerical results under monotonic and cyclic loadings are presented in the paper and compared with the experimental results. As it can be seen in the paper, there is a good agreement between the numerical results obtained from the model and laboratory evidences. Also, for the investigation of micro-planes behaviour, the micro-component stress-strain histories that occurred on the micro-planes during the uniaxial and triaxial compressive tests are illustrated.
The proposed model can simulate concrete structure behaviour under any arbitrary load combinations including static and dynamic loadings. It can also predict the crack initiation, evolution and propagation within the concrete material under the load effects well.
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