Behaviour of fibre-reinforced high-performance concrete in exterior beam-column joint

Muthupriya, P.; Boobalan, S C; Vishnuram, B. G.

doi:10.1007/s40091-014-0057-2

Cited by 12 publications

(10 citation statements)

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“…Few authors have tested such BCJ with diagonal cross bar joint shear reinforcements. 26,[33][34][35][36][37] Rajagopal and Prabavathy 26 different type of joint reinforcement ranging from type T anchorage (headed bar) to X-cross bar. The X-cross bar is in addition to conventional joint reinforcement as shown in Figure 3.…”

Section: Diagonal Cross Bar Joint Shear Reinforcementmentioning

confidence: 99%

“…Cracked pattern of the BCJ detailed to Indian code (a) 38 (b) 34,39 F I G U R E 7 Seismically designed exterior steel-reinforced BCJ 40 The BCJ specimens' joint aspect ratio was kept constant at 1.5, but the percentage content and type of the steel fibers used in the concrete were varied. The tested BCJ samples were made from normal weight concrete (having 28th day compressive strength of 21 MPa), UHPFRC (with 0.5%-2% hooked fibers and 1.5% straight fibers).…”

Section: F I G U R Ementioning

confidence: 99%

“…Some authors 11,30,34,49 tested BCJ made with highstrength concrete and observed interesting results as summarized in Table 1. BCJ specimens made with concrete compressive strength of about 50 MPa without joint shear reinforcement, tested by Arowojolu et al 11 failed by BJ failure mode, with the formation of plastic hinges at the BCJ interface.…”

Section: F I G U R Ementioning

confidence: 99%

“…The use of diagonal cross bar reinforcement with sufficient lap length has been suggested by some design codes to preclude shear failure in monolithic reinforced BCJ sections. Few authors have tested such BCJ with diagonal cross bar joint shear reinforcements 26,33–37 . Rajagopal and Prabavathy 26 tested six BCJ specimens having different type of joint reinforcement ranging from type T anchorage (headed bar) to X‐cross bar.…”

Section: Current Approaches For Designing and Detailing Beam–column Jmentioning

confidence: 99%

“…It was concluded that the X‐cross bar is effective in controlling yielding of the BCJ reinforcement and ultimate failure as it displayed improved ductility of 23.6%, 13.83% higher stiffness and 15% higher ultimate load. Muthupriya et al 34 using Indian codes 38,39 provided diagonal cross bar in the core of the BCJ core as shown in Figure 5. The failure of the specimen designed with 38 was initiated by yielding of the beam bottom longitudinal reinforcement followed by slippage of the reinforcement, while those designed with 39 displayed similar failure modes as shown in Figure 6, but with higher ultimate load and ductility.…”

Section: Current Approaches For Designing and Detailing Beam–column Jmentioning

confidence: 99%

See 4 more Smart Citations

Plastic hinge relocation in exterior reinforced beam–column joint and compliance issues to seismic design guidelines—A review

Arowojolu

Ibrahim

2019

Structural Concrete

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The current recommendations for the design of monolithic reinforced concrete beam-column joints allowed for the provision of transverse reinforcements at the joint to avoid brittle shear failure of the joint during seismic events but neglected the effect of plastic hinge penetration in the joint leading to bond deterioration and shear failure, especially for external frames. In this paper, previous studies conducted by different authors using the seismic design recommendations are reviewed for failure modes and the effectiveness of the code recommendations to avoid joint failure. Various retrofitting strategies to upgrade nonseismically designed beam-column joints are also reviewed. Methods of plastic hinge relocation in beam-column joints of new construction were proposed and verified with numerical simulation. This study contributes to knowledge by highlighting areas of concern in current design guidelines and a call for further research on code compliant exterior beamcolumn joint for better seismic performance.

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Section: Diagonal Cross Bar Joint Shear Reinforcementmentioning

confidence: 99%

Section: F I G U R Ementioning

confidence: 99%

Section: F I G U R Ementioning

confidence: 99%

Section: Current Approaches For Designing and Detailing Beam–column Jmentioning

confidence: 99%

Section: Current Approaches For Designing and Detailing Beam–column Jmentioning

confidence: 99%

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Plastic hinge relocation in exterior reinforced beam–column joint and compliance issues to seismic design guidelines—A review

Arowojolu

Ibrahim

2019

Structural Concrete

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Seismic behaviour of Exterior RC beam-column joints repaired and strengthened using post-tensioned metal straps

Helal,

Garcia,

Imjai

et al. 2024

Bull Earthquake Eng

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Exterior beam-column joints are the most vulnerable part of substandard reinforced concrete (RC) buildings and are often the first to be damaged during earthquakes. This article presents an experimental and numerical investigation into the behaviour of exterior RC beam-column joints repaired and strengthened using Post-Tensioned Metal Straps (PTMS) for active confinement. The study focused on full-scale beam-column joints with an inadequate core zone detailing, thus emulating the deficiencies found in existing substandard RC buildings. Initially, four “bare” joints were subjected to cyclic tests to induce substantial damage within the core zone. Subsequently, the damaged core of the joints was repaired and recast with new concrete, and PTMS were applied to strengthen the joints, followed by another round of cyclic testing. The experimental findings were compared with predictions generated through established models from existing literature. The results revealed that ASCE/SEI 41–17 guidelines accurately predict the shear capacity of the bare joints. It is shown that recasting the core with new concrete significantly increased the joint’s shear capacity by up to 42% compared their bare counterparts. The use of PTMS strengthening further enhanced the capacity by up to 25%. A “scissors model” was employed for numerical simulations of both bare and PTMS-strengthened joints using DRAIN-2DX, which proved effective at predicting their nonlinear load-displacement envelope response. This article contributes towards the development of new cost-effective post-earthquake strengthening techniques for beam-column joints, with the potential to reduce the vulnerability of substandard RC buildings in developing countries.

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Seismic Behaviour of Exterior Beam-Column Joint Using Steel Fibre-Reinforced Concrete Under Reverse Cyclic Loading

2022

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Behaviour of fibre-reinforced high-performance concrete in exterior beam-column joint

Cited by 12 publications

References 0 publications

Plastic hinge relocation in exterior reinforced beam–column joint and compliance issues to seismic design guidelines—A review

Plastic hinge relocation in exterior reinforced beam–column joint and compliance issues to seismic design guidelines—A review

Seismic behaviour of Exterior RC beam-column joints repaired and strengthened using post-tensioned metal straps

Seismic Behaviour of Exterior Beam-Column Joint Using Steel Fibre-Reinforced Concrete Under Reverse Cyclic Loading

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