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Finite element analyses of FRP-strengthened concrete beams with corroded reinforcement
https://orcid.org/0000-0003-3259-4600
https://orcid.org/0000-0001-8775-9893
https://orcid.org/0000-0003-4513-5358
https://orcid.org/0000-0002-4516-7440
Abstract Existing deteriorated reinforced concrete (RC) structures need strengthening to extend service life. Fibre reinforced polymer (FRP) has been widely used to strengthen sound structures, but its application on damaged concrete structures still needs to be investigated. This paper presents non-linear finite element analyses conducted to assess the flexural behaviour of corrosion-damaged RC beams strengthened with externally bonded FRP. Beams in four different categories were analysed: a reference beam, a corroded but non-strengthened beam, and corroded beams strengthened with glass FRP (GFRP) and carbon FRP (CFRP) respectively. Furthermore, the strengthened beams were modelled with different modelling choices to investigate the effectiveness of FRP applied to the beam soffit and as U-jackets. Pre-loading and corrosion-induced cracks were incorporated by reducing the tensile strength of concrete elements at crack locations. Average and pitting corrosion were incorporated by reducing the cross-sectional area of the reinforcement corresponding to the measured corrosion levels. Interface elements were used to simulate the bond between FRP and concrete. The modelling methods were validated against experimental results. It was found that modelling of pitting corrosion, especially the location of pits, lengths and number of pits considered, were influential in predicting the load and deformation capacity of beams. A CFRP plate at the beam soffit, combined with inclined U-jackets at its ends of the CFRP plate provided sufficient flexural strengthening. Thus, intermediate U-jackets did not further increase the load-bearing capacity for the studied beam geometry and corrosion damages. However, with a GFRP sheet at the beam soffit, both inclined and intermediate U-jackets were needed to provide full utilisation of the GFRP sheet for the studied beam geometry. In further studies of the effectiveness of the strengthening methods, it is recommended to investigate beams of varying dimensions, corrosion patterns and levels, and FRP spacing and dimensions.
Highlights Modelling methods for FE analyses of strengthened, deteriorated RC beams were verified. Appropriate modelling of pitting corrosion is vital for load and deformation capacity. Load capacity and failure mode is affected by interface properties between different FRPs. FRP strengthening method was effective for RC beams with severe pitting corrosion. Intermediate U-jackets may not always be required.
Finite element analyses of FRP-strengthened concrete beams with corroded reinforcement
https://orcid.org/0000-0003-3259-4600
https://orcid.org/0000-0001-8775-9893
https://orcid.org/0000-0003-4513-5358
https://orcid.org/0000-0002-4516-7440
Abstract Existing deteriorated reinforced concrete (RC) structures need strengthening to extend service life. Fibre reinforced polymer (FRP) has been widely used to strengthen sound structures, but its application on damaged concrete structures still needs to be investigated. This paper presents non-linear finite element analyses conducted to assess the flexural behaviour of corrosion-damaged RC beams strengthened with externally bonded FRP. Beams in four different categories were analysed: a reference beam, a corroded but non-strengthened beam, and corroded beams strengthened with glass FRP (GFRP) and carbon FRP (CFRP) respectively. Furthermore, the strengthened beams were modelled with different modelling choices to investigate the effectiveness of FRP applied to the beam soffit and as U-jackets. Pre-loading and corrosion-induced cracks were incorporated by reducing the tensile strength of concrete elements at crack locations. Average and pitting corrosion were incorporated by reducing the cross-sectional area of the reinforcement corresponding to the measured corrosion levels. Interface elements were used to simulate the bond between FRP and concrete. The modelling methods were validated against experimental results. It was found that modelling of pitting corrosion, especially the location of pits, lengths and number of pits considered, were influential in predicting the load and deformation capacity of beams. A CFRP plate at the beam soffit, combined with inclined U-jackets at its ends of the CFRP plate provided sufficient flexural strengthening. Thus, intermediate U-jackets did not further increase the load-bearing capacity for the studied beam geometry and corrosion damages. However, with a GFRP sheet at the beam soffit, both inclined and intermediate U-jackets were needed to provide full utilisation of the GFRP sheet for the studied beam geometry. In further studies of the effectiveness of the strengthening methods, it is recommended to investigate beams of varying dimensions, corrosion patterns and levels, and FRP spacing and dimensions.
Highlights Modelling methods for FE analyses of strengthened, deteriorated RC beams were verified. Appropriate modelling of pitting corrosion is vital for load and deformation capacity. Load capacity and failure mode is affected by interface properties between different FRPs. FRP strengthening method was effective for RC beams with severe pitting corrosion. Intermediate U-jackets may not always be required.
Finite element analyses of FRP-strengthened concrete beams with corroded reinforcement
https://orcid.org/0000-0003-3259-4600
https://orcid.org/0000-0001-8775-9893
https://orcid.org/0000-0003-4513-5358
https://orcid.org/0000-0002-4516-7440
Abstract Existing deteriorated reinforced concrete (RC) structures need strengthening to extend service life. Fibre reinforced polymer (FRP) has been widely used to strengthen sound structures, but its application on damaged concrete structures still needs to be investigated. This paper presents non-linear finite element analyses conducted to assess the flexural behaviour of corrosion-damaged RC beams strengthened with externally bonded FRP. Beams in four different categories were analysed: a reference beam, a corroded but non-strengthened beam, and corroded beams strengthened with glass FRP (GFRP) and carbon FRP (CFRP) respectively. Furthermore, the strengthened beams were modelled with different modelling choices to investigate the effectiveness of FRP applied to the beam soffit and as U-jackets. Pre-loading and corrosion-induced cracks were incorporated by reducing the tensile strength of concrete elements at crack locations. Average and pitting corrosion were incorporated by reducing the cross-sectional area of the reinforcement corresponding to the measured corrosion levels. Interface elements were used to simulate the bond between FRP and concrete. The modelling methods were validated against experimental results. It was found that modelling of pitting corrosion, especially the location of pits, lengths and number of pits considered, were influential in predicting the load and deformation capacity of beams. A CFRP plate at the beam soffit, combined with inclined U-jackets at its ends of the CFRP plate provided sufficient flexural strengthening. Thus, intermediate U-jackets did not further increase the load-bearing capacity for the studied beam geometry and corrosion damages. However, with a GFRP sheet at the beam soffit, both inclined and intermediate U-jackets were needed to provide full utilisation of the GFRP sheet for the studied beam geometry. In further studies of the effectiveness of the strengthening methods, it is recommended to investigate beams of varying dimensions, corrosion patterns and levels, and FRP spacing and dimensions.
Highlights Modelling methods for FE analyses of strengthened, deteriorated RC beams were verified. Appropriate modelling of pitting corrosion is vital for load and deformation capacity. Load capacity and failure mode is affected by interface properties between different FRPs. FRP strengthening method was effective for RC beams with severe pitting corrosion. Intermediate U-jackets may not always be required.
Finite element analyses of FRP-strengthened concrete beams with corroded reinforcement
Gotame, Milan (author) / Franklin, Carl Lindqvist (author) / Blomfors, Mattias (author) / Yang, Jincheng (author) / Lundgren, Karin (author)
Engineering Structures ; 257
2022-02-07
Article (Journal)
Electronic Resource
English
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