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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 22
ADVANCES IN FINITE ELEMENT TECHNIQUES 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 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
Abstract
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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