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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 22
Edited by: M. Papadrakakis and B.H.V. Topping
Paper IV.6

A Model with Tension Softening for Concrete Beams under Combined Torsion, Flexure, Shear and Prestressing

C.G. Karayannis

Laboratory of Reinforced Concrete, Department of Civil Engineering, Democritus University of Thrace, Xanthi, Greece

Full Bibliographic Reference for this paper
C.G. Karayannis, "A Model with Tension Softening for Concrete Beams under Combined Torsion, Flexure, Shear and Prestressing", in M. Papadrakakis, B.H.V. Topping, (Editors), "Advances in Finite Element Techniques", Civil-Comp Press, Edinburgh, UK, pp 161-167, 1994. doi:10.4203/ccp.22.4.6
The use of a concrete model with tension softening, for the investigation of the behaviour of prestressed concrete members under combined torsion, flexure and shear, is introduced. The proposed model comprises a) a bilinear stress-strain relationship with post-cracking tension softening, for the modelling of the concrete behaviour under tension, and b) special failure criteria for the concrete under biaxial loading. Furthermore, for the solution of the governing equations a special numerical method has been adopted which can be applied to elements with practically arbitrary cross-section shape since it utilizes a numerical mapping. The proposed model has been applied to a series of prestressed concrete double-T shaped beams, under various loading combinations, for which experimental data are available. Comparisons of the predicted behaviour with the measured one in all examined cases showed excellent agreement.

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