Behaviour of heat-damaged partially-insulated RC beams using NSM systems

Jadooe, Awad; Al-Mahaidi, Riadh; Abdouka, Kamiran

doi:10.1016/j.conbuildmat.2018.05.279

Cited by 14 publications

(4 citation statements)

References 17 publications

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“…It pushed back the start of the debonding process and slowed it down in reinforced concrete (RC) beams that had been rebuilt with carbon-fiber-reinforced polymer (CFRP) sheets that were close to the surface. Additionally, the studies [24][25][26][27] mentioned that when compared to beams repaired with cement-based adhesive, beams fixed using epoxy adhesive showed a greater load-bearing capability. These studies found that increasing plate thickness and reducing fastener spacing resulted in improvements in post-fire RC beams repaired using the Bolted Steel Plate (BSP) method.…”

Section: Effectiveness Of the Repair Technique For Fire-damaged Beamsmentioning

confidence: 99%

“…Repair methods aimed at improving the post-fire performance of damaged beams are then evaluated. These methods include the use of additional reinforcement and the implementation of steel jacketing, complemented by concrete of varying compressive strengths (25,30, 35, and 40 MPa). Eurocode models for both concrete and steel materials are used in the simulations using SAFIR software.…”

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confidence: 99%

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A Numerical Investigation into the Effectiveness of Composite Jacket Strengthening (CJS) on Fire-Damaged Concrete Beams

Dimia,

Baghdadi,

Belakhdar

et al. 2024

ACSM

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After a fire exposure, reinforced concrete (RC) structures typically retain their integrity, yet they incur significant damage due to material degradation and thermal expansion. The restoration of fire-damaged RC structures is a complex structural engineering challenge. This study presents a numerical investigation on the post-fire behavior of RC beams, subjected to parametric fire for different durations (15, 30, 60, and 90 minutes) and their retrofit method. Initially, the impact of high-temperature conditions on the residual load-bearing capacity is assessed, with a focus on beam length and support conditions as key geometric variables. Repair methods aimed at improving the post-fire performance of damaged beams are then evaluated. These methods include the use of additional reinforcement and the implementation of steel jacketing, complemented by concrete of varying compressive strengths (25,30, 35, and 40 MPa). Eurocode models for both concrete and steel materials are used in the simulations using SAFIR software. Results indicate a decrease in load-carrying capacity with prolonged fire exposure, with capacity reductions reaching 85% for beams subjected to 90-minute fire scenarios. Application of steel jacketing markedly enhances both bending and shear resistance of the compromised beams, with the ability to restore the load-bearing capacity of one-hour fire-exposed beams by up to 112%. The correlation between repair effectiveness and the inherent resistance of the RC beams is also elucidated. Furthermore, an analytical expression is proposed for estimating the post-fire load-bearing capacity of reinforced beams, offering a practical and accurate tool for engineering assessments.

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Section: Effectiveness Of the Repair Technique For Fire-damaged Beamsmentioning

confidence: 99%

mentioning

confidence: 99%

A Numerical Investigation into the Effectiveness of Composite Jacket Strengthening (CJS) on Fire-Damaged Concrete Beams

Dimia,

Baghdadi,

Belakhdar

et al. 2024

ACSM

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“…It has been shown in tests that heating exposure may significantly influence the tensile strength of steel [233]. Due to these findings, 700 and 800 °C heating temperatures were expected to severely diminish the load-carrying capability and toughness of fired samples at the uppermost temperatures [234,235].…”

Section: Post-cooling Spallingmentioning

confidence: 99%

Fire spalling behavior of high-strength concrete: A critical review

Amran

Huang

Onaizi

et al. 2022

Construction and Building Materials

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“…Kigha et al [23] emphasized experimentally that the steel tensile strength is significantly influenced by heating exposure if the temperature exceeds 700 °C. Accordingly, exposures to heating temperatures of 700 and 800 °C were considered to cause significant in the load-carrying capacity and stiffness of the heated beams associated with the highest temperatures [18,19]. Thongchom et al [35] carried out a test program on five simply supported reinforced concrete T-beams to investigate the effect of sustained service loading of 31.6 kN at elevated temperatures on the residual flexural response after exposure to heating temperatures of 700 and 900 °C for three hours and then cooled in ambient condition.…”

Section: Introduction and Research Significancementioning

confidence: 99%

Post-fire serviceability and residual strength of composite post-tensioned concrete T-beams

2021

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In this study, the response of ten composite post-tensioned concrete beams topped by a reinforced concrete deck with adequate reinforcing shear connectors is investigated. Depending on the concrete compressive strength of the deck slab (20, 30, and 40 MPa), beams are grouped into three categories. Seven of these beams are exposed to a fire attack of 700 and 800 °C temperature simultaneously with or without the presence of a uniformly distributed sustained static loading. After cooling back to ambient temperature, these composite beams are loaded up to failure, using a force control module, by monotonic static loading in a four-point-bending setup with two symmetrical concentrated loads applied in the middle third of the effective span. The objectives of this study include investigating the behavior of the composite prestressed concrete beams under and after the exposure to a direct fire flame, as well as finding their residual load-carrying capacity. Tests demonstrate significant deteriorations caused by exposure to high temperatures associated with the increase of the member’s camber. The increase of the midspan camber after heating exposure reached approximately 200%. On the other hand, the 1-h steady-state exposure of test specimens to temperatures of 700 and 800 °C led to reduce the load-carrying capacity of the heat-deteriorated beams up to 45% and 54%, respectively.

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Behaviour of heat-damaged partially-insulated RC beams using NSM systems

Cited by 14 publications

References 17 publications

A Numerical Investigation into the Effectiveness of Composite Jacket Strengthening (CJS) on Fire-Damaged Concrete Beams

A Numerical Investigation into the Effectiveness of Composite Jacket Strengthening (CJS) on Fire-Damaged Concrete Beams

Fire spalling behavior of high-strength concrete: A critical review

Post-fire serviceability and residual strength of composite post-tensioned concrete T-beams

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