INFLUENCE OF RESTRAINED SHRINKAGE IN RC BUILDUING SLABS: A CASE STUDY

Author(s): Carlos Sousa, Emanuel Felisberto, Rui Faria
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
ISBN:978-2-35158-171-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 641-650
Total Pages: 10
Language : English

Abstract: The control of cracking in reinforced concrete (RC) slabs, axially restrained by earth retaining
walls or bracing systems, is a topic of practical relevance. However, even today the correct
procedures to quantify the minimum steel reinforcement to ensure adequate performance
under service conditions are insufficiently known. In fact, the required reinforcement is
affected by several variables difficult to quantify, of which one of the most important is the
axial tensile force installed on the slab due to restraints to shrinkage and thermal imposed
deformations. This paper presents a procedure for serviceability analysis of cracked RC slabs,
towards quantifying the required areas of steel reinforcement for controlling crack widths.
The procedure is consistent with the principles of normative documents such as the
Eurocode 2 (EC2) and the fib Model Code. It is based on a nonlinear finite-element (FE)
analysis, in which cracking is modelled via a smeared cracking approach. A multi-fixed
cracking model with strain decomposition is used to include the effects of shrinkage, creep
and thermal deformations. An example involving the serviceability analysis of a restrained
RC solid slab is used to demonstrate the proposed methodology potentialities, as well as the
implications of the involved phenomena.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00