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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2012, Vol. 13 Issue (8): 571-583    DOI: 10.1631/jzus.A1100317
Mechanics and Civil Engineering     
Deflection analysis of reinforced concrete beams strengthened with carbon fibre reinforced polymer under long-term load action
Mykolas Daugevi?ius, Juozas Valivonis, Gediminas Mar?iukaitis
Department of Reinforced Concrete and Masonry Structures, Vilnius Gediminas Technical University, Saul?tekio Ave. 11, LT-10223 Vilnius, Lithuania
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Abstract  This paper presents the results of an experimental research on reinforced concrete beams strengthened with an external carbon fibre reinforced polymer (CFRP) layer under long-term load action that lasted for 330 d. We describe the characteristics of deflection development of the beams strengthened with different additional anchorages of the external carbon fibre composite layer during the period of interest. The conducted experiments showed that the additional anchorage influences the slip of the external layer with respect to the strengthened element. Thus, concrete and carbon fibre composite interface stiffness decreases with a long-term load action. Therefore, the proposed method of analysis based on the built-up-bars theory can be used to estimate concrete and carbon fibre composite interface stiffness in the case of long-term load.

Key words： Carbon fibre composite      Beam strengthening      Beam deflection      Long-term load      Bending stiffness      Concrete and carbon fibre composite interface stiffness      Effective inertia moment     
Received: 17 November 2011      Published: 03 August 2012
CLC:  TU411  
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Mykolas Daugevi?ius
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Gediminas Mar?iukaitis
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Mykolas Daugevi?ius, Juozas Valivonis, Gediminas Mar?iukaitis. Deflection analysis of reinforced concrete beams strengthened with carbon fibre reinforced polymer under long-term load action. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2012, 13(8): 571-583.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1100317     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2012/V13/I8/571

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