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New Formula for Creep of Concrete in fib Model Code 2010
Current Issue
Volume 3, 2015
Issue 5 (October)
Pages: 59-66   |   Vol. 3, No. 5, October 2015   |   Follow on         
Paper in PDF Downloads: 47   Since Sep. 8, 2015 Views: 1046   Since Sep. 8, 2015
Authors
[1]
Janusz Holowaty, Faculty of Civil Engineering and Architecture, West Pomeranian University of Technology, Szczecin, Poland.
Abstract
Advances in concrete technology and the adoption of new materials have required the calibration of a new model for creep of concrete in the fib Model Code 2010. The model covers also a wider range of concrete grades. The main factors affecting the prediction of concrete creep are limited to code-type levels. To describe creep, a well-established concept for basic creep has been developed. In the paper, for the presentation and comparison of creep deformation, creep coefficients and creep function are used as the most common and comprehensive parameters for the time-dependent analysis of concrete structures. The presented creep data are calculated using a standard computer spreadsheet program. The fib MC2010 model for creep introduces improvements in the analysis and assessment of the time-dependent deformation of concrete structures. The complexity of creep prediction is significantly reduced and a range of influencing parameters is excluded from the model for simplicity and easy adoption at the design level. Simple comparison with previously used creep models allows it to be stated that the fib MC2010 generally gives even higher values of final creep deformation than Eurocode 2. The model predicts final creep coefficients for up to 50 years of loading with good approximation, but results of recent practical observations show higher values of creep after 30 to 50 years in service.
Keywords
Creep of Concrete, Concrete Models, Time Dependent Properties
Reference
[1]
ACI 209R-92 (Reapproved 2008) Prediction of Creep, Shrinkage, and Temperature Effects in Concrete Structures, ACI Manual of Concrete Practice, 2009.
[2]
Bažant Z.P., Li G.H., Yu Q.; Prediction of creep and shrinkage and their effects in concrete structures: Critical appraisal, Eighth International Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures (CONCREEP-8), Taylor & Francis Group, London, 2009; p. 1275-89.
[3]
Bažant Z.P., Hubler M.H., Yu Q.; Excessive Creep Deflections: An Awakening, Concrete International, Vol. 33, No. 8, pp. 44-46.
[4]
CEB-FIB Model Code 1990. Design Code, Thomas Telford, London, 1993.
[5]
Code-type models for concrete behaviour. Background of MC2012, fib Bulletin No.70, fédération internationale du béton / International Federation for Structural Concrete (fib), Lausanne, 2013.
[6]
EN 1992-1-1:2004. Eurocode 2: Design of concrete structures. Part 1-1: General rules for buildings.
[7]
EN 1992-2: 2008. Eurocode 2: Design of concrete structures. Part 2: Concrete bridges. Design and detailing rules.
[8]
fib Model Code for Concrete Structures 2010, Ernst & Sohn, Berlin, 2013.
[9]
Hołowaty, J., Creep in cement concrete in conventional models, The 8th International Conference, AMCM 2014, Analytical Models and New Concepts in Concrete and Masonry Structures, Wrocław, 2014, pp. 140-1.
[10]
Hołowaty, J., What’s new in creep of concrete in fib Model Code 2010, The 10th Central European Congress on Concrete Engineering CCC 2014 – Concrete Offers for Period of Economic Recovery. Liberec, 2014, pp. 29-30.
[11]
Hołowaty, J., Creep and Shrinkage of Concrete in Eurocode 2 and Polish Bridge Standards—Necessity for Implementation, Journal of Civil Engineering and Architecture, Vol. 9, No. 4, 2015, pp. 460-6.
[12]
Hołowaty, J., Creep of concrete in contemporary code-type models, Journal of Civil Engineering and Architecture, in print.
[13]
Mola, F., Pellegrini, M.; The new model for creep of concrete in fib Model Code 2010, 37th Conference on Our World in Concrete & Structures, CI-Premier PTE, Singapore 2012, 15 p.
[14]
Müller, H.S., Anders, I., Breiner, R. and Vogel, M.; Concrete: treatment of types and properties in fib Model Code 2010, Journal of the fib - Structural Concrete, Vol. 14, No. 4, 2013, p. 320-34.
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