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Keywords: concrete, finite element modelling, plasticity, Chen criteria, assessment.

Summary

The design and static analysis of reinforced concrete structures are usually based on a linear elastic hypothesis of material behaviour. Obviously, there is some consideration of non-linear behaviour of concrete in the stage of assessment but the main part of computational analysis is done with use of linear elastic material properties.

The traditional approach to the design of reinforced concrete structures has several disadvantages and it requires additional steps to obtain more precise results for deformations of such structures. A design which is based on non-linear constitutive modelling of concrete should provide somewhat more precise results, namely deformations. Many different constitutive models exist [1,2]. These models are based on various assumptions, some of them use elasto-plastic theory and others utilise fracture mechanics approaches, for example.

The paper discusses an ongoing research project concerning a proposed algorithm for the assessment of reinforced concrete structures which is based on elasto-plastic constitutive modelling. The selected approaches include a Chen-Chen plasticity and failure condition, an Ohtani-Chen hardening concept and a smeared model for the reinforcement. The elasto-plastic approach can be used if the pre-peak behaviour of the structure is studied which is sufficient for most of common civil engineering problems.

References

1: Z.P. Bazant, J. Planas "Fracture and Size Effect in Concrete and Other Quasibrittle Materials", CRC Press, Boca Raton, USA, 1998.
2: A.C.T. Chen, W.F. Chen "Constitutive Relations for Concrete", Journal of the Engineering Mechanics Division ASCE, 1975.

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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: 91 PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping, L.F. Costa Neves and R.C. Barros Paper 121 Approach to the Assessment of Concrete Structures based on Non-Linear Elasto-Plastic Analysis O. Sucharda and J. Brozovsky Department of Structural Mechanics, Faculty of Civil Engineering, VSB-Technical University of Ostrava, Czech Republic doi:10.4203/ccp.91.121 purchase the full-text of this paper Full Bibliographic Reference for this paper O. Sucharda, J. Brozovsky, "Approach to the Assessment of Concrete Structures based on Non-Linear Elasto-Plastic Analysis", in B.H.V. Topping, L.F. Costa Neves, R.C. Barros, (Editors), "Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 121, 2009. doi:10.4203/ccp.91.121 Keywords: concrete, finite element modelling, plasticity, Chen criteria, assessment. Summary The design and static analysis of reinforced concrete structures are usually based on a linear elastic hypothesis of material behaviour. Obviously, there is some consideration of non-linear behaviour of concrete in the stage of assessment but the main part of computational analysis is done with use of linear elastic material properties. The traditional approach to the design of reinforced concrete structures has several disadvantages and it requires additional steps to obtain more precise results for deformations of such structures. A design which is based on non-linear constitutive modelling of concrete should provide somewhat more precise results, namely deformations. Many different constitutive models exist [1,2]. These models are based on various assumptions, some of them use elasto-plastic theory and others utilise fracture mechanics approaches, for example. The paper discusses an ongoing research project concerning a proposed algorithm for the assessment of reinforced concrete structures which is based on elasto-plastic constitutive modelling. The selected approaches include a Chen-Chen plasticity and failure condition, an Ohtani-Chen hardening concept and a smeared model for the reinforcement. The elasto-plastic approach can be used if the pre-peak behaviour of the structure is studied which is sufficient for most of common civil engineering problems. References 1 Z.P. Bazant, J. Planas "Fracture and Size Effect in Concrete and Other Quasibrittle Materials", CRC Press, Boca Raton, USA, 1998. 2 A.C.T. Chen, W.F. Chen "Constitutive Relations for Concrete", Journal of the Engineering Mechanics Division ASCE, 1975. 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 £140 +P&P)
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