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Computers and Concrete
  Volume 13, Number 6, June 2014 , pages 799-827
DOI: https://doi.org/10.12989/cac.2014.13.6.799
 


Investigating deformations of RC beams: experimental and analytical study
Javier Ezeberry Parrotta, Hugo Corres Peiretti, Viktor Gribniak and Alejandro Pérez Caldentey

 
Abstract
    In this paper, a theoretical and experimental study of the sectional behaviour of reinforced concrete beams subjected to short-term loads is carried out. The pure bending behaviour is analysed with moment-curvature diagrams. Thus, the experimental results obtained from 24 beams tested by the authors and reported in literature are compared with theoretical results obtained from a layered model, which combines the material parameters defined in Model Code 2010 with some of the most recognized tension-stiffening models. Although the tests were carried out for short-term loads, the analysis demonstrates that rheological effects can be important and must be accounted to understand the experimental results. Another important conclusion for the beams tested in this work is that the method proposed by EC-2 tends to underestimate the tension-stiffening effects, leading to inaccuracies in the estimations of deflections. Thus, the actual formulation is analysed and a simple modification is proposed. The idea is the separation of the deflection prediction in two parts: one for short-term loads and other for rheological effects (shrinkage). The results obtained are in fairly good agreement with the experimental results, showing the feasibility of the proposed modification.
 
Key Words
    reinforced concrete; moment-curvature; tension stiffening; beam growth; serviceability; shrinkage; eurocode 2; Model Code 2010; effective modulus of inertia
 
Address
Javier Ezeberry Parrotta, Hugo Corres Peiretti and Alejandro Pérez Caldentey: Polytechnic University of Madrid. Profesor Aranguren 3, 28040 Madrid, Spain

Viktor Gribniak: Vilnius Gediminas Technical University. Sauletekio av. 11, 10223 Vilnius, Lithuania and Institute of Polymer Mechanics, University of Latvia. Raina Blvd. 19, 1586 Riga, Latvia

 

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