Comparison of analytical methods for estimation of early-age thermal-shrinkage stresses in RC walls

• Autorzy: Klemczak B. , Knoppik-Wróbel A.
• Języki publikacji: EN

Abstrakty

EN

The volume changes caused by coupled temperature and moisture variations in early-age concrete elements lead to formation of stresses. If a restraint exists along the contact surface of mature concrete against which a new concrete element has been cast, generated stresses are mostly of a restraint origin. In engineering practice a wide range of externally restrained concrete elements can be distinguished such as tank walls or bridge abutments cast against an old set foundation, in which early-age cracking may endanger their durability or functionality. Therefore, for years methods were being developed to predict early-age stresses and cracking risk of externally restrained concrete elements subjected to early-age thermal-moisture effects. The paper presents the comparative study of the most recognised analytical approaches: the method proposed in EC2, the method proposed by ACI Committee 207 and the method developed at the Luleå University of Technology.

Słowa kluczowe

EN

RC wall; thermal-shrinkage stress; degree of restraint; analytical model

PL

ściana żelbetowa; naprężenie termiczno-skurczowe; stopień ograniczenia; model analityczny

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2013
• Tom: Vol. 59, nr 1
• Strony: 97--117
• Opis fizyczny: Bibliogr. 11 poz., il., tab.

Twórcy

autor

Klemczak B.

• Silesian University of Technology, Gliwice

autor

Knoppik-Wróbel A.

• Silesian University of Technology, Gliwice

Bibliografia

• 1. B. KLEMCZAK, A. KNOPPIK-WRÓBEL, Analiza naprężeń w ścianie żelbetowej poddanej wczesnym wpływom termiczno-skurczowym (Analysis of stresses in reinforced concrete wall subjected to early-age thermal-shrinkage effects). Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska, 59, 3, 85-92, 2012.
• 2. A. KNOPPIK-WRÓBEL, The influence of self-induced and restraint stresses on crack development in reinforced concrete wall subjected to early-age thermal-shrinkage effects. Proceedings of 14th International Conference of Postgraduate Students Juniorstav, 162, Brno 2012.
• 3. M. ZYCH, Analiza pracy ścian zbiorników żelbetowych we wczesnym okresie dojrzewania betonu w aspekcie ich wodoszczelności (Analysis of work of RC tank walls in early ages of concrete curing in the view of their water tightness), PhD Thesis, Faculty of Civil Engineering, Cracow Technical University, 2011.
• 4. EN 1992-3. Eurocode 2 - Design of concrete structures - Part 3: Liquid retaining and containment structures.
• 5. ACI Committee 207. Report on Thermal and Volume Change Effects on Cracking of Mass Concrete (ACI 207.2R-07). ACI Manual of Concrete Practice, Part 1, 2011.
• 6. M. NILSSON, Restraint factors and partial coefficients for crack risk analyses of early age concrete Structures. PhD Thesis, Luleå University of Technology, 2003.
• 7. M. LARSON, Thermal crack estimation in early age concrete: models and methods for practical application. PhD Thesis, Luleå University of Technology, 2003.
• 8. EN 1992-1-1. Eurocode 2 - Design of concrete structures - Part 1-1: General rules and rules for buildings.
• 9. K. FLAGA, Naprężenia skurczowe i zbrojenie przypowierzchniowe w konstrukcjach betonowych (Shrinkage stresses and surface reinforcement in concrete structures). Monograph 295, Wydawnictwo Politechniki Krakowskiej, Kraków 2011.
• 10. B. KLEMCZAK, Prediction of Coupled Heat and Moisture Transfer in Early-Age Massive Concrete Structures. Numerical Heat Transfer. Part A: Applications, 3, 212-233, 2011.
• 11. W. KIERNOŻYCKI, Betonowe konstrukcje masywne (Massive concrete structures). Wydawnictwo Polski Cement, Kraków 2003.