NUMERICAL SIMULATION SINCE EARLY AGES OF THE RG8 BEAM TEST FROM CONCRACK BENCHMARK BY MEANS OF A 3D FIBRE FRAME MODEL

Author(s): María D. Crespo, Denise Ferreira, Jesús M. Bairán, Antonio Marí
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:978-2-35158-170-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 162-171
Total Pages: 10
Language : English

Abstract: This work presents the numerical analysis of the RG8 test performed by the French research
program Concrack2 in 2011. It consisted in a large RC beam specimen loaded in bending
after restrained shrinkage. The specimen is composed of a central thinner part and two
massive heads linked by two cylindrical struts that restrained strains due to thermal effects
and autogenous shrinkage occurring in the concrete central part. After 8 weeks, the beam was
loaded near to its ultimate capacity. The numerical model is based on the 3D fibre beam
approach, capable of reproducing the response since early ages. The cross-section is
discretized into fibres to take into account the different maturity levels within the cross-
section. The analysis is divided into three phases: i) the thermal analysis determines the
development of temperatures due to cement hydration and heat transfer, solar radiation and
night cooling effects, ii) nonlinear mechanical analysis for early ages including creep,
autogenous shrinkage and ageing and iii) nonlinear mechanical analysis for loading phase
includes the interaction of normal and shear forces. Performance is compared against
experimentation and the development of early age stresses discussed.

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