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Keywords: micro-plane, damage, concrete, monotonic, cyclic.

Summary

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:

Compressive strain/stress
Tensile strain/stress
Shear strain/stress
Compressive + Shear strain/stress
Tensile + Shear strain/stress

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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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 86 PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping Paper 113 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 doi:10.4203/ccp.86.113 purchase the full-text of this paper Full Bibliographic Reference for this paper 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. Summary 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: Compressive strain/stress Tensile strain/stress Shear strain/stress Compressive + Shear strain/stress Tensile + Shear strain/stress 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. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £120 +P&P)
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