Experimental investigation on cyclic response of RC elements repaired by CFRP external reinforcing systems

Capani, Francesco; D’Ambrisi, Angelo; Stefano, Mario De; Focacci, Francesco; Nudo, Raffaele; Penna, Rosa

doi:10.1016/j.compositesb.2016.12.053

Cited by 17 publications

(7 citation statements)

References 17 publications

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“…In other works, the experimental results lead to observations of FRP delamination before the fatigue failure of the steel reinforcement [ 16 ]. Many more studies have evaluated the fatigue behavior of the FRP/FRCM beam-column joint and masonry specimens [ 17 , 18 , 19 , 20 , 21 ]. An interesting study of the fatigue behavior of RC beams strengthened in flexure with steel-reinforced inorganic polymers (SRPs) [ 6 ] concluded and confirmed that the beams failed due to fatigue of the steel reinforcement with a partial debonding of the external fibers contributing to extending the strength of the beams and extending their fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Behavior Under Repeated Loading of RC Beams Externally Strengthened in Flexure with SRG Systems

Bencardino

Nisticò

2023

Materials

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Steel-reinforced grout (SRG) systems are effective methods for the flexural strengthening of reinforced concrete (RC) beams. In this study, the effect of a limited number of repeated loads on the structural response and debonding evolution of strengthened beams was experimentally investigated. The number of available research concerning the cyclic behavior of SRG-strengthened members is quite limited and this research attempts to cover this knowledge. A total of ten full-scale RC beam specimens were tested under a four-point bending scheme. The effectiveness of the traditional externally bonded (EB) strengthening technique was compared with a promising innovative technique referred to as inhibiting/repairing/strengthening (IRS). The test variables included the use of two SRG configurations using high and low steel strip density. The experimental results revealed that the performance of the beams was largely dependent on the spacing of the steel strands within the reinforcing strip. Under repeated loading, the debonding of the external system takes place when steel fiber with high mass per unit of area was used. By increasing the matrix impregnation of the steel strip, the composite system was not affected by debonding. Further, the efficiency in terms of flexure enhancement, local and global ductility performance and energy dissipation of the beams are also discussed.

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Section: Introductionmentioning

confidence: 99%

Behavior Under Repeated Loading of RC Beams Externally Strengthened in Flexure with SRG Systems

Bencardino

Nisticò

2023

Materials

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“…The transverse confinement techniques that are widely applied to the reinforcement and retrofitting of RC columns with insufficient seismic capacity include external steel jacketing [5][6][7][8][9][10][11], fiber-reinforced plastic (FRP) composite wrapping [12][13][14][15][16][17], external posttensioning or prestressing [4,[18][19][20][21][22], and bonded steel plating [23][24][25][26][27][28]. These reinforcement methods should improve the RC columns' seismic capacity and provide precision, simplicity, and economic feasibility in construction, as well as convenience in maintenance.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Shear Performance of Reinforced Concrete Columns Strengthened by External Steel Rods

Lee

Kim

2021

Sustainability

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This study presents a strengthening method for reinforced concrete (RC) columns. The proposed method, which consists of a pair of steel rods, two reverse-threaded couplers, and four corner blocks, is feasible and straightforward. A quasi-static cyclic loading test was performed on the columns externally strengthened by the steel rods. It was found that the corner blocks and the external steel rods with a low prestress level effectively confined the concrete on the compression side of plastic hinges, which eventually induced flexural failure with a ductility higher than three in the strengthened columns. In addition, an analytical approach to predict the shear strength and ultimate flexural strength of the externally strengthened columns was applied. The comparison of analytical and experimental results showed that the analytical approach provided highly accurate predictions on the maximum strength and the failure mode of the externally strengthened columns. It is expected that the application of the proposed method will improve the seismic performance of damaged or deteriorated RC structures, thereby increasing their lifespan expectancy and sustainability.

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“…Colomb et al [7] evaluated the mechanical characteristics of continuously or discontinuously reinforced CFRP. Capani et al [8] studied the effectiveness of CFRP reinforcement for strengthening damaged RC specimens. Realfonzo and Napoli [9] investigated the effects of reinforcement with CFRP or glass fiber reinforced polymer (GFRP), CFRP wrapping, and longitudinal steel angles in terms of the strength, ductility, and energy dissipation capacity.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength of Reinforced Concrete Columns Retrofitted by Glass Fiber Reinforced Polyurea

2020

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Aged structures and structures constructed based on outdated non-seismic design codes should be retrofitted to enhance their strength, ductility, and durability. This study evaluates the structural performance of reinforced concrete (RC) columns enhanced via polyurea or glass fiber reinforced polyurea (GFRPU) strengthening. Four RC column specimens, including a reference specimen (an unstrengthened column), were tested to evaluate the parameters of the strengthening materials and the strengthened area. The tests were carried out under a combined constant axial compressive load and quasi-static cyclic loading. The experimental results show that the composite strengthening provides lateral confinement to the columns and leads to enhanced ductility, shear-resistance capacity, and dissipated energy. The shear strength provided by the composites depends on the degree of lateral confinement achieved by the composite coating. The specimens finally failed through the development of diagonal tension cracks within the potential plastic hinge regions. The specimen treated with GFRPU strengthening showed greater strength and dissipated more energy than the specimen treated with polyurea strengthening. Furthermore, by modifying ATC-40, this study proposed an equation to estimate the shear capacity provided by the composites.

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Experimental investigation on cyclic response of RC elements repaired by CFRP external reinforcing systems

Cited by 17 publications

References 17 publications

Behavior Under Repeated Loading of RC Beams Externally Strengthened in Flexure with SRG Systems

Behavior Under Repeated Loading of RC Beams Externally Strengthened in Flexure with SRG Systems

Cyclic Shear Performance of Reinforced Concrete Columns Strengthened by External Steel Rods

Shear Strength of Reinforced Concrete Columns Retrofitted by Glass Fiber Reinforced Polyurea

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