Behavior of Damaged Exterior RC Beam-Column Joints Strengthened by CFRP Composites

Beydokhty, Ebrahim Zamani; Shariatmadar, Hashem

doi:10.1590/1679-78252258

Cited by 28 publications

(14 citation statements)

References 12 publications

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“…Researches show that the FRP strengthening technology for RC beam-column joints can effectively improve the seismic performance of the joints without obviously increasing self-weight or volume [1][2][3][4][5][6][7][8], and this technology has the advantages of high strengthto-weight ratio, convenience in construction, and excellent corrosion resistance as well. However, the main forms of FRP materials are sheets and plates, which are usually externally bonded on the surfaces of beam-column joints.…”

Section: Introductionmentioning

confidence: 99%

Study of Seismic Behavior of RC Beam-Column Joints Strengthened by Sprayed FRP

Zhao

Liu

2018

Advances in Materials Science and Engineering

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To study the seismic behavior of RC beam-column joints strengthened with sprayed FRP, five 1 : 2 reduced-scale specimens of joints were tested through quasi-static experiments. e failure modes, hysteretic curves, skeleton curves, strength, deformation, degradation of strength and stiffness, ductility, and energy dissipation capacity were studied. Furthermore, the effect of three main influencing factors including the sprayed FRP thickness, strengthened area, and axial compression ratio was analyzed in this paper as well. e results show that sprayed FRP strengthening can improve the seismic behavior of RC beam-column joints effectively.e increase of sprayed FRP thickness can lead to a better seismic performance for the joints. Strengthening area can affect the bearing capacity obviously. Higher axial compression ratio can increase the bearing capacity and initial stiffness, but it can make the deformation capacity and ductility decreased. e study can provide references to further research on the sprayed FRP material for strengthening of RC beam-column joints.

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Section: Introductionmentioning

confidence: 99%

Study of Seismic Behavior of RC Beam-Column Joints Strengthened by Sprayed FRP

Zhao

Liu

2018

Advances in Materials Science and Engineering

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“…Ebrahim and Hashim [10] used CFRP sheets to wrap the critical regions of the beam, column and the joint zone of the examined sub-assemblages for confining these regions. The results showed that the method is effective and capable of restoring or even upgrading load-carrying capacity and initial stiffness of damaged joints.…”

Section: A Carbon Fiber Reinforced Polymer (Cfrp)mentioning

confidence: 99%

A State-Of-The-Art Review on Retrofitting Beam-Column Joint Using GFRP with NSM Technique under Seismic

Kader¹,

Osman²,

Yatim³

2019

IJET

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Recent development of seismic action has highlighted the consequences of poor performance of beam-column joints, which has been identified as the main principle cause of failure when the frame is subjected to earthquake loading. This paper summarized numerous past studies according to the type of beam-column joint, retrofitting techniques and fiber reinforced polymer (FRP). For this purposes, 100 research works from previous researchers were collected. The structural behavior of beam-column joint has been extensively studied in the past decades. Experimental and analytical solutions have been conducted and proposed by many researchers to understand the behavior of the beam-column joint. However, Near Surface Mounted (NSM) technique using Glass Fiber Reinforced Polymer (GFRP) in retrofitting beam-column joint has yet to be investigated. Therefore, this study is proposed for future research. In-depth investigations must be carried out as to gain more thorough understanding on the behavior of retrofitted beam-column joint using GFRP with NSM technique.

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“…Al-Salloum and and Almusallam and Al-Salloum (2007) performed experimental studies and assessments using simulated seismic loads to determine how effective the external bonds between CFRP sheets and concrete were in enhancing the sheer strength and ductility of beam-column joints. The behavior of retrofitted beam-concrete joints was studied by Beydokhty and Shariatmadar (2016). It was found that there were eight joints that were impaired, restored and strengthened with externally bonded CFRP sheets.…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Exterior RC Beam-Column Joints Retrofitted using CFRP Sheets

Laseima

Mutalib

Osman

et al. 2020

Lat. Am. j. solids struct.

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The seismic behavior of full-scale exterior reinforced concrete (RC) beam-column joints retrofitted with externally bonded Carbon Fiber Polymers (CFRP) is examined in this paper. Casting and testing of two similar reinforced concrete beam column connections in the absence of transverse reinforcement at the joints took place under opposing cyclic loading with regulated displacement so as to examine their fundamental seismic performance. The first joint was examined as the control specimen and the other specimen was then retrofitted with CFRP sheets, with rounded border of the column and beam at and close to the joint region to change them from square to squircle segments. It is demonstrated in the experimental findings that the retrofitted beam column joint shows significantly greater strength, energy dissipation and ductility in comparison to the control specimen. There was a shift in the failure from the joint region to the beam ends in the retrofitted specimens, which would help in preventing the structure from disintegrating progressively. Because of the change in the beam and column from square to squircle segments, the debonding potential of the CFRP decreased and the restrictive impact of the CFRP increased. As a result, the experimental findings were verified using a 3D nonlinear finite element (FE) model. When the finite element and experimental findings are compared, it is determined that the suggested model is quite accurate.

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Behavior of Damaged Exterior RC Beam-Column Joints Strengthened by CFRP Composites

Cited by 28 publications

References 12 publications

Study of Seismic Behavior of RC Beam-Column Joints Strengthened by Sprayed FRP

Study of Seismic Behavior of RC Beam-Column Joints Strengthened by Sprayed FRP

A State-Of-The-Art Review on Retrofitting Beam-Column Joint Using GFRP with NSM Technique under Seismic

Seismic Behavior of Exterior RC Beam-Column Joints Retrofitted using CFRP Sheets

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