Influence of opening sizes on the flexural behavior of heat-damaged reinforced concrete slabs strengthened with CFRP ropes

Al-Rousan, Rajai Z.

doi:10.1016/j.cscm.2022.e01464

Cited by 10 publications

(3 citation statements)

References 26 publications

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“…The amount of absorbed energy for the gradually cooled and suddenly cooled slabs decreased by (58%) and (52%), respectively, compared to the average of the reference tiles. This is in agreement with Rosan (2022) who studied the behavior of slabs with openings by exposing them to heat at different temperatures (200 º C,400 º C and 600 º C). The results indicated that the absorbed energy decreases with increasing temperature according to the following percentages (24, 50.6 and 76.6) %.…”

Section: Energy Absorption Ductility Factorsupporting

confidence: 91%

Rehabilitation of Fire-damaged Reinforced-concrete Slabs Using Ferro-cement

Aldarf

2024

JJCE

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his study was conducted to investigate the effect of strengthening with ferro-cement on the flexural behavior of two-way RC slabs after exposure to direct fire. Twelve reinforced-concrete slabs were exposed to direct fire for one hour and cooled with air and water. They were then rehabilitated with a layer of ferro-cement using different bonding patterns (surface roughening, SBR material and screws). The effect of these variables was studied on the load-deflection relationship, ultimate load capacity, stiffness, energy absorption, ductility factor and strains of the compressed zone. The results showed a significant improvement in all the investigated parameters, demonstrating the efficiency of ferro-cement strengthening in improving the behavior of the slabs. It contributed to increasing the ultimate load capacity and initial stiffness of the slabs and to preventing and arresting crack propagation after cracking and even after reaching collapse. The effectiveness of SBR material in ensuring the bonding between the surface of the damaged slabs and the reinforcement layer was also revealed. KEYWORDS: Solid slab, Direct fire flame, Ferro-cement, Rehabilitation, SBR (styrene-butadiene rubber), Roughing.

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Section: Energy Absorption Ductility Factorsupporting

confidence: 91%

Rehabilitation of Fire-damaged Reinforced-concrete Slabs Using Ferro-cement

Aldarf

2024

JJCE

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“…The use of CFRP to repair and strengthen RC one-way slabs has been the subject of various investigations. For many years, researchers have sought to study methods for repairing and strengthening slabs that have been damaged by fire [41][42][43][44][45]. Exposure of slabs to thermal shock, for any reason, would weaken the flexural and shear capacity.…”

Section: Research Significancementioning

confidence: 99%

Repairing of One-Way Solid Slab Exposed to Thermal Shock Using CFRP: Experimental and Analytical Study

Shhabat,

Ashteyat,

Abdel-Jaber

2024

Fibers

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This research was conducted to investigate, experimentally, theoretically, and numerically, the use of CFRP materials for repairing a reinforced concrete one-way solid slab exposed to thermal shock. Nine slabs, measuring 1800 mm in length, 500 mm in width, and 100 mm in depth, were cast. Seven of these slabs underwent thermal shock at a temperature of 600 °C, rapidly cooled by immersion in water for 15 min. Three primary parameters were examined: the type of CFRP (rope, strip, and sheet), spacing (100 and 200 mm), and the number of sheet layers (one and two). The experimental results revealed a significant decrease of approximately 45.4% in the compressive strength of the concrete after exposure to thermal shock. The thermally shocked RC slab showed a reduction in ultimate capacity by 15.4% and 38.5% in stiffness compared to the control slab. The results underscored the efficacy of CFRP materials, with all repair configurations exhibiting a substantial increase in maximum load capacity and stiffness. Capacity enhancement ranged from 23.7% to 53.4%, while stiffness improvement ranged from 27.6% to 57.1%. Notably, all repair configurations effectively minimized the maximum deflection. This reduction in deflection ranged from 5.2% to 26% compared to the control slab. Numerical results demonstrated strong concurrence with experimental results for both capacity and deflection. The enhancement in capacity ranged from 0.7% to 10.4%, while deflection decreased within a range from 0.95% to 14.16% compared to experimental results.

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“…For instance, punching shear failure can occur in a conical shape, which causes a slab to dramatically collapse progressively after the induced load is redistributed, and consequent overloading the various structural elements within the system [ 2 , 3 ]. Also, several factors influence the flexural performance of RC slabs, including structural element size, cement, aggregate, moisture level, and ambient environmental conditions [ [4] , [5] , [6] ].…”

Section: Introductionmentioning

confidence: 99%

Structural retrofitting of RC slabs using bamboo fibre laminate: Flexural performance and crack patterns

Awoyera,

Althoey,

Bahrami

et al. 2024

Heliyon

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Influence of opening sizes on the flexural behavior of heat-damaged reinforced concrete slabs strengthened with CFRP ropes

Cited by 10 publications

References 26 publications

Rehabilitation of Fire-damaged Reinforced-concrete Slabs Using Ferro-cement

Rehabilitation of Fire-damaged Reinforced-concrete Slabs Using Ferro-cement

Repairing of One-Way Solid Slab Exposed to Thermal Shock Using CFRP: Experimental and Analytical Study

Structural retrofitting of RC slabs using bamboo fibre laminate: Flexural performance and crack patterns

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