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CFRP strengthening system to increase fatigue resistance of bridges

 CFRP strengthening system to increase fatigue resistance of bridges
Author(s): ,
Presented at IABSE Congress: The Evolving Metropolis, New York, NY, USA, 4-6 September 2019, published in , pp. 1464-1468
DOI: 10.2749/newyork.2019.1464
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Carbon fiber reinforced polymers (CFRP) laminates externally bonded with epoxy resins are an often used strengthening technique of aged and overloaded structures, e.g. bridges. A well-known, though...
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Bibliographic Details

Author(s): (Institute of Reinforced Concrete Structures and Building Materials (IMB) – Department of Reinforced Concrete Structures)
(Institute of Reinforced Concrete Structures and Building Materials (IMB) – Department of Reinforced Concrete Structures)
Medium: conference paper
Language(s): English
Conference: IABSE Congress: The Evolving Metropolis, New York, NY, USA, 4-6 September 2019
Published in:
Page(s): 1464-1468 Total no. of pages: 5
Page(s): 1464-1468
Total no. of pages: 5
DOI: 10.2749/newyork.2019.1464
Abstract:

Carbon fiber reinforced polymers (CFRP) laminates externally bonded with epoxy resins are an often used strengthening technique of aged and overloaded structures, e.g. bridges. A well-known, though not commonly discussed, problem is the stiff bond behavior of the used adhesives. Their use leads to stress concentrations in the CFRP and concrete at the location of cracks and an uneven strain distribution of internal and external reinforcement. On that basis, the usage of such a strengthening technique for components subjected to dynamic loads is limited or almost impossible due to premature debonding of the CFRP.

The present paper focuses on numerical analysis of reinforced concrete bending beams strengthened with CFRP using the finite element method. In our analysis we focus on contact modelling techniques. The effect of differing adhesives on the overall behavior of the strengthened beams and strain distribution of internal and external reinforcement is shown. Numerical investigations demonstrate the relevance of the used adhesive on the static and fatigue behavior of the strengthened component. Modified and optimized material properties of the adhesive lead to a strengthening system which is even capable of carrying dynamic loads.

Keywords:
fatigue adhesive strengthening RC Structures CFRP