Analytical Model for FRP Confinement of Concrete Columns with and without Internal Steel Reinforcement

Pellegrino, Carlo; Modena, Claudio

doi:10.1061/(asce)cc.1943-5614.0000127

Cited by 146 publications

(94 citation statements)

References 33 publications

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“…Several studies on the performance of FRP wrapped columns have been conducted, using both experimental and analytical approaches [1][2][3][4][5][6][7][8][9]. Such strengthening technique has proved to be very effective in enhancing their ductility and axial load capacity.…”

Section: Introductionmentioning

confidence: 99%

Structural behaviour of square RC columns confined with CFRP wraps

et al. 2018

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Abstract. Loading capacity and strains of square reinforced concrete (RC) columns, strengthened with external carbon fiber reinforced polymer (CFRP) sheets, were tested and evaluated. The experimental parameters include: number of wrap layers, concrete strength and the slenderness of the columns (L/a). All test specimens were loaded to failure in axial compression. Compressive stress, axial and hoop strains have been recorded to evaluate the stress-strain relationship, ultimate strength, stiffness, and ductility of the specimens. Results clearly demonstrate that composite wrapping can enhance the structural performance of RC columns in terms of both maximum strength and ductility. The effects of test parameters are evidenced and compared.

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Section: Introductionmentioning

confidence: 99%

Structural behaviour of square RC columns confined with CFRP wraps

et al. 2018

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“…[4], [5], [6], [7], [8] and [9]. The current research aims at enhancing seismic resistance of buildings through simple models and techniques with the use of highly deformable energy-dissipating reinforced concrete elements made of FRP-confined reinforced rubberised concrete.…”

Section: Introductionmentioning

confidence: 99%

Highly Deformable Energy-Dissipating Reinforced Concrete Elements in Seismic Design of Reinforced Concrete Structures

Owoichoechi¹,

Pilakoutas²

2017

IJERA

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Incorporating scrap tyre rubber particles as partial replacement for aggregates has been found to produce concrete with improved ductility, deformability and damping which are desired characteristics of a viable material for enhancing structural response to earthquake vibrations. An analytical study using Drain-2dX was carried out to investigate the response of 4-storey, 3-bay reinforced concrete frames on innovative rubberised concrete deformable foundation models to simulated earthquake scaled to 5 different peak ground accelerations. Stress-strain properties of 3-layers aramid fibre-reinforced polymer (FRP)-confinement for concrete incorporating waste rubber from scrap vehicle tyres were used to model the elements of this foundation models. With a partial decoupling of the superstructure from the direct earthquake force, the models showed up to 70% reduction in base shear, an improved overall q-factor of 7.1, and an estimated frame acceleration of 0.11g for an earthquake peak ground acceleration of 0.44g. This implies that a non-seismically designed reinforced concrete frame on the proposed rubberised concrete deformable foundation system would provide a simple, affordable and equally efficient alternative to the conventional and usually expensive earthquake resistant concrete frames. A supplementary Arrest System (SAS) was proposed to anchor the frame from the resulting soft storey at the rubberised concrete foundation. A further research is recommended for the design of concrete hinges with rubberised concrete as used in the model with the most impressive response.

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“…Therefore, the buckling of steel rebars in FRP-confined RC columns is generally postponed to a higher strain level due to FRP-confinement, which, however, may not completely eliminate the possibility of rebar buckling (Tastani et al 2006;Bournas and Triantafillou 2011), particularly when the column section is non-circular and FRP confinement is not so effective. If buckling of rebars does occur, the growth of inelastic buckling deformation of rebars may lead to additional strains in the FRP jacket, causing its premature rupture (Tastani and Pantazopoulou 2004;Pellegrino and Modena 2010;Rousakis andKarabinis 2012, Bai et al 2015). This interaction between the steel rebars and the external FRP jacket through the concrete cover is an important mechanism governing the behavior of FRP-confined RC columns.…”

Section: Introductionmentioning

confidence: 99%

“…Although a large amount of research has been conducted on the strength and ductility of FRP-confined concrete (e.g., Lam and Teng 2003;Dai et al 2011), there has been rather limited work on the effect of FRP confinement on the buckling of steel rebars (e.g., Tastani and Pantazopoulou 2004;Pellegrino and Modena 2010;Megalooikonomou et al 2012); this is contrast with the situation concerning conventional RC columns, for which steel rebar buckling has received extensive research attention (e.g., Priestley et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Finite element modeling of steel bar buckling in FRP-confined RC columns

Bai¹,

Dai

2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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Fiber-reinforced polymer (FRP) confining jackets offer an attractive solution for the seismic retrofit of reinforced concrete (RC) columns. For an accurate prediction of the strength and ductility of FRP-confined RC columns, it is necessary to understand the interaction between the FRP jacket and the RC column at all deformation levels under seismic loading. In particular, when widely-spaced steel stirrups/spirals are used as the transverse steel reinforcement, the longitudinal steel bars are likely to develop buckling deformations, which are however restrained by the FRP-confined concrete cover. This paper presents a "beam-on-elastic foundation" model for simulating the buckling behavior of longitudinal steel reinforcing bars laterally supported by FRP-confined concrete using the finite element (FE) approach. In addition, a curved beam approximation is proposed to evaluate the stiffness of the lateral springs that are used to represent the restraining effect offered by the FRP-confined concrete cover. The proposed FE model is verified through comparisons between the predicted and the experimental average stress-strain relationships of steel reinforcing bars, the latter of which were obtained from compression tests of FRP-confined RC columns. The proposed FE model provides an effective method for simulating the buckling behavior of laterally supported longitudinal reinforcing bars for a more accurate analysis of the behavior of FRP-confined RC columns.

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Analytical Model for FRP Confinement of Concrete Columns with and without Internal Steel Reinforcement

Cited by 146 publications

References 33 publications

Structural behaviour of square RC columns confined with CFRP wraps

Structural behaviour of square RC columns confined with CFRP wraps

Highly Deformable Energy-Dissipating Reinforced Concrete Elements in Seismic Design of Reinforced Concrete Structures

Finite element modeling of steel bar buckling in FRP-confined RC columns

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