Shear strengthening of beam-column joints

Ghobarah, A.; Said, Aly

doi:10.1016/s0141-0296(02)00026-3

Cited by 245 publications

(96 citation statements)

References 5 publications

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“…In the past four decades, multiple studies were performed to assess the seismic behavior of the existing reinforced concrete beam-column joints designed in accordance with different codes of various countries [12][13][14][15][16][17]. In the previous two decades, the seismic retrofitting of imperfect RC beam-column joints has been given substantial attention and multiple techniques have been proposed to seismically retrofit the reinforced concrete beam-column joints [18][19][20][21][22][23][24][25]. The goal of these studies was to improve the shear and bonding capacity of the joints to forestall brittle failure and also to ensure that beam plastic hinging would occur.…”

Section: Introductionmentioning

confidence: 99%

Seismic Retrofit of Defective RC Beam-Column Joints

Akhaveissy

Permanoon

Mirzaei

2018

Period. Polytech. Civil Eng.

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Section: Introductionmentioning

confidence: 99%

Seismic Retrofit of Defective RC Beam-Column Joints

Akhaveissy

Permanoon

Mirzaei

2018

Period. Polytech. Civil Eng.

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“…Meanwhile, such older RC frames may not satisfy the current seismic design requirements, and do not possess adequate ductility. Previous research studies attributed that to inadequate shear reinforcement in the beam-column joint region, as stated in Alemdar and Sezen (2010) and Ghobarah and Said (2002). The behavior of the beam-column joint in RC frames is thus a crucial point that requires good design and detailing when strengthening RC moment resisting frames (Kam et al (2011), Alemdar and Sezen (2010), and Sasmal et al (2011a)).…”

Section: Introductionmentioning

confidence: 99%

An Analytical Study of Improving Beam-Column Joints Behavior Under Earthquakes

Elmasry

Abdelkader

Elkordy

2017

Facing the Challenges in Structural Engineering

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Abstract. Many existing worldwide Reinforced Concrete (RC) structures, such as non-ductile RC frames, were designed for gravity loads only during the 1950s through 1970s or earlier. Due to variations in the identification of seismic active zones by national codes, such structures may not satisfy the current design requirements, especially when lying in a recently identified seismic active zone. This is because such structures, as a result of poorer reinforcement detailing, may generally do not possess the adequate ductility and strength needed to withstand an expected earthquake. Consequently, older RC frames may undergo substantial damage during earthquakes. One of the main damage aspects in such case is clear cracks around and within the beam-column connections. This is the case where the failure of beam-column joints is governed by bond and shear failure mechanisms which are usually brittle. This may be attributed to inadequate shear reinforcement in the beam-column joints region. Accordingly, several techniques of repairing and strengthening beam-column joints in older RC frames have been reported especially in earthquake prone countries. In this paper, a finite element model for an exterior beam-column joint is presented to simulate the behaviour of such joints in older gravity load designed RC frame structures. Several specimens are studied, one for the unstrengthened case, and others represent strengthened cases with different techniques. Studied strengthening techniques include using banded joints with CFRP sheets as a proposed technique, or joints reinforced with steel jackets as observed from older research in literature. Each case is modelled then analysed when loaded incrementally till failure. The stress and deformation results are evaluated then compared for each case. Numerical results show that the beam-column joint strengthened with CFRP can increase their structural stiffness, strength and energy dissipation capacity in contrast to other techniques. The proposed strengthening technique is even advantageous for practical requirements.

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“…Glass fibre (GFRP) jackets were found to be capable of increasing the shear resistance of the joints by enhancing its ductility. Using GFRP jacketing, the integrity of the concrete could be maintained by confinement, significantly improving the ductility and the load carrying capacity of the rehabilitated joint [8]. Web bonded FRP retrofitting at joints was found to result in 40% increase in the lateral load resisting capacity of RC frames [9].…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Study on Strengthening of RC Beam Column Joint Using Hybrid FRP Composites

Gnanapragasam¹,

Chitra²,

Ravi³

2016

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Beam-Column joints are critical zones in reinforced concrete structures which are most vulnerable to earthquake forces. Hence strengthening beam-column joint is vital to save the structure and its inhabitants in case of seismic forces. Numerous retrofitting works using fibre reinforced polymer (FRP) composites are being undertaken worldwide. This work aims to investigate the effectiveness of strengthening beam-column joints using natural and artificial fibres. In this study, basalt (natural fibres) as monolithic composite (BFRP) and as hybrid composite along with glass (artificial fibres) were used for strengthening of beam-column joints. Totally six specimens were prepared and tested under monotonic loading. Specimen details used were: two control specimen, two specimens for monolithic wrapping and remaining two specimens for hybrid wrapping. The test results were compared with control and rehabilitated specimens. The performance of the treated joints was studied using the following parameters: initial and ultimate cracking loads, energy absorption, deflection ductility and stiffness at ultimate. From the test results, it was found that the hybrid combination of Basalt and Glass FRPs were found to be more effective in the treatment of beam-column joints. The strong column weak beam concept was achieved by failure in beam portion which helped in preventing the catastrophic failure of the entire structure.

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Shear strengthening of beam-column joints

Cited by 245 publications

References 5 publications

Seismic Retrofit of Defective RC Beam-Column Joints

Seismic Retrofit of Defective RC Beam-Column Joints

An Analytical Study of Improving Beam-Column Joints Behavior Under Earthquakes

Study on Strengthening of RC Beam Column Joint Using Hybrid FRP Composites

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