Cyclic behavior of strong beam–weak column joints strengthened with different configurations of CFRP sheets

Ilia, Elaheh; Mostofinejad, Davood; Moghaddas, Amirreza

doi:10.1007/s43452-020-0015-7

Cited by 23 publications

(12 citation statements)

References 24 publications

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“…The strengthening of concrete structures is the field of construction where composite materials made of FRPs (fibrereinforced polymers) are being introduced most quickly and with the greatest success [1,2], mainly due to their corrosion resistance, good mechanical properties and lightness that translates into ease and savings in the execution of works. Typical FRP applications include flexural strengthening [3], shear strengthening [4] or strengthening of beam-column joints suffering from both flexural and shear deficiencies [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the compressive behaviour of FRP-confined rectangular concrete columns

Diego

Martı́nez

Castro

et al. 2022

Archiv.Civ.Mech.Eng

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This paper presents a comprehensive experimental study on the behaviour of FRP-confined concrete in square and rectangular columns and focuses on some issues that might be addressed with a view to improving the predictive models. For this purpose, 31 prismatic concrete specimens with a height of 600 mm and low- and medium-strength concrete (20–35 MPa) were tested under centred compression. The parameters studied were the aspect ratio between the sides of the section (1, 1.5 and 2), the radius of curvature of the corners (20, 25 and 30 mm) and the number of carbon FRP layers applied. The experimental results included stress–strain curves of specimens and detailed information about the confined concrete strength and the axial and lateral strain achieved on the FRP jacket during the tests. The stress–strain response and ultimate condition are analysed, showing that FRP jacketing is an efficient technique for increasing the strength and strain capacity, but that confinement efficiency decreases as the aspect ratio of the section increases. In spite of such decrease, significant strength improvement was achieved for low-strength concrete in rectangular sections with aspect ratios of 1.5 (strength gain up to 81%), and even 2 (up to 36%). The axial strength of the tests was compared with the design criteria of four international guidelines, resulting in predictions that did not properly fit for rectangular sections. A predictive equation is proposed to assess the axial compressive strength of the FRP-confined concrete, which includes a better adjustment for the strain efficiency factor and the shape factor for rectangular columns.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on the compressive behaviour of FRP-confined rectangular concrete columns

Diego

Martı́nez

Castro

et al. 2022

Archiv.Civ.Mech.Eng

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“…The test concluded that the EBROG technique combined with the FRP anchors has successfully eradicated the debonding failure of the FRP composites and enhanced the seismic capacity of the BCJ. A similar study was conducted by Ilia et al [47] using the EBROG technique in combination with FRP anchors in the X-shaped layout to strengthen the deficient BCJ. It was concluded that the EBROG technique along with other combinations successfully eliminated the debonding of the FRP composites and improved the strength characteristics of the weak column-strong beam joints.…”

Section: Introductionmentioning

confidence: 81%

“…To assess the effectiveness of L-shaped CFRP sheets (LCS), only the BCJ of the ground floor slab was strengthened with LCS. To avoid debonding of the FRP composites, which is most likely to occur at the beam-column interface [24,47], a narrow opening in the slab adjacent to the beam along with complete wrapping around the L-shaped FRP sheets were proposed. The ACI 440.2R also suggests the superior performance of a complete wrapping around the perimeter of the strengthened section [51].…”

Section: Preliminary Design Of Frp Composite Retrofit Schemementioning

confidence: 99%

An Improved Anchorage System for L-Shaped FRP Composites to Enhance the Seismic Response of Beam-Column Joints in a Low-Strength Substandard Reinforced Concrete (RC) Frame

Adil,

Rahman,

Ali

et al. 2024

Buildings

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Reinforced concrete buildings are prone to collapse during seismic events due to the brittle shear failure of non-seismic beam-column joints (BCJ). In this study, two one-third scale reinforced concrete (RC) frames incorporating various non-seismic details were tested under lateral cyclic loading. One of the RC frames was used as control, while the other was strengthened using externally bonded carbon-fiber-reinforced polymer (CFRP) sheets in a L-Shaped configuration with particular attention to anchorage to evade debonding. For the strengthening process, L-shaped CFRP sheets were bonded to the inner face of columns, extended on beams both above and below the joint up to a hinge length. To avert debonding, the L-shaped CFRP sheets were fully wrapped with CFRP sheets around the column, both near the joint and at the end of the sheet. The sheets were also wrapped around the beam, through two slots in the slab that were adjacent to the beam-column interface and at the far end of the sheet. Test results confirmed that the installation of CFRP sheets in an L-shaped configuration altered the brittle-shear failure mechanism of the beam-column joints to a ductile failure by repositioning the hinges away from the columns. Additionally, the proposed anchorage method successfully eradicated the debonding and peel-off of the CFRP sheets. Moreover, strengthening with the CFRP sheets in the L-shaped configuration enhanced the strength and ductility of the RC frame by 45% and 43%, respectively. According to the findings of this study, the application of L-shaped CFRP sheets proved effective in strengthening RC frame structures.

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“…In this paper, all previous studies using the grooving method to retrofit structural members were evaluated. A total of 445 tests were performed by these studies, out of which 141 tests were for flexural strengthening of beams and slabs [44][45][67][68][69][70][71][72][73][74][75][76][77][78][79][80], 86 tests for shear strengthening of beams [81][82][83][84][85][86][87][88], 182 tests for strengthening columns [89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105], and 36 tests for strengthening beam-column joints [106][107][108][109][110][111][1...…”

Section: Introductionmentioning

confidence: 99%

RC members externally strengthened with FRP composites by grooving methods including EBROG and EBRIG: A state-of-the-art review

Sanginabadi

Yazdani

Mostofinejad

et al. 2022

Construction and Building Materials

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Cyclic behavior of strong beam–weak column joints strengthened with different configurations of CFRP sheets

Cited by 23 publications

References 24 publications

Experimental investigation on the compressive behaviour of FRP-confined rectangular concrete columns

Experimental investigation on the compressive behaviour of FRP-confined rectangular concrete columns

An Improved Anchorage System for L-Shaped FRP Composites to Enhance the Seismic Response of Beam-Column Joints in a Low-Strength Substandard Reinforced Concrete (RC) Frame

RC members externally strengthened with FRP composites by grooving methods including EBROG and EBRIG: A state-of-the-art review

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