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82. Shear behaviour of prestressed beams reinforced with steel fibres



Title: 82. Shear behaviour of prestressed beams reinforced with steel fibres
Author(s): B. Belletti, P. Bernardi, A. Meda
Paper category : conference
Book title: 6th International RILEM Symposium on Fibre Reinforced Concretes
Editor(s): M. di Prisco, R. Felicetti and G.A. Plizzari
Print-ISBN: 2-912143-51-9
e-ISBN: 2912143748
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 925 - 934
Total Pages: 10
Nb references: 16
Language: English


Abstract: The aim of this paper is to improve the knowledge of the behaviour of prestressed FRC and RC beams when shear failure occurs. A set of experimental tests on full-scale beams was carried out, taking particular attention to the design of the beam geometry, so as to provide information about the mechanical response of the beams both near and away from the transfer length of the strands.
The performed tests were simulated by means of a finite element procedure able to predict the non linear behaviour of prestressed FRC and RC beams. A modified version of PARC stiffness matrix, in which the FRC constitutive response has been suitably modelled, has been implemented into the FE code ABAQUS. This constitutive relationship enables to model plain or reinforced concrete beams by means of membrane elements, allowing to consider the reinforcement due to both steel rebars and fibres.
By means of the proposed numerical procedure, the contribution of the main phenomena occurring after cracking (such as aggregate interlock, bridging effect due to concrete and fibres, etc.) on the final shear capacity has been evaluated by means of an energetic approach. The different mechanisms will be analysed on the basis of the obtained results with particular regard to the effect of fibres.


Online publication: 2004-08-30
Publication type : full_text
Public price (Euros): 0.00