Effect of CFRP and TRM Strengthening of RC Slabs on Punching Shear Strength

Abbas, Husain; Abadel, Aref A.; Almusallam, Tarek; Al-Salloum, Yousef

doi:10.1590/1679-78251277

Cited by 19 publications

(12 citation statements)

References 29 publications

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“…The reinforcement was chosen for flexural failure by steel yielding prior to concrete crushing. Abbas et al [37] studied 600 mm × 600 mm × 90 mm flat slabs supported along two parallel sides to span in one-way. The steel reinforcement ratio on the tension face was 0.71%.…”

Section: O4 S4mentioning

confidence: 99%

“…The first peak is associated with the punching failure of concrete as it loses shear capacity followed by a drop in the curve during which resistance is due to aggregate interlocked and reinforcing steel dowel action as shown in Figure 15. Abbas et al [37] studied 600 mm × 600 mm × 90 mm flat slabs supported along two parallel sides to span in one-way. The steel reinforcement ratio on the tension face was 0.71%.…”

Section: O4 S4mentioning

confidence: 99%

“…Polymers 2020, 12, x 13 of 28 Figure 14. One-way supporting concrete specimen strengthened with CFRP sheet covering the entire specimen except the circular loading area [37].…”

Section: O4 S4mentioning

confidence: 99%

“…In comparison to the control slab which would have experience significant drop in load-carrying capacity, the second peak of CFRP offers the slab much higher load-carrying capacity 189.6% (for 39.9 MPa concrete) and 275.5% (for 63.2 MPa concrete). One-way supporting concrete specimen strengthened with CFRP sheet covering the entire specimen except the circular loading area [37].…”

Section: O4 S4mentioning

confidence: 99%

“…Load-displacement variation for punching of slabs for concrete grade B (SB: control slab; CFRP strengthened slab; and SB-T: TRM strengthened slab)[37].…”

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confidence: 99%

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Fiber Reinforced Polymer Laminates for Strengthening of RC Slabs against Punching Shear: A Review

2020

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Reinforced concrete flat slabs or flat plates continue to be among the most popular floor systems due to speed of construction and inherent flexibility it offers in relation to locations of partitions. However, flat slab/plate floor systems that are deficient in two-way shear strength are susceptible to brittle failure at a slab-column junction that may propagate and lead to progressive collapse of a larger segment of the structural system. Deficiency in two-way shear strength may be due to design/construction errors, material under-strength, or overload. Fiber reinforced polymer (FRP) composite laminates in the form of sheets and/or strips are used in structurally deficient flat slab systems to enhance the two-way shear capacity, flexural strength, stiffness, and ductility. Glass FRP (GFRP) has been used successfully but carbon FRP (CFRP) sheets/strips/laminates are more commonly used as a practical alternative to other expensive and/or challenging methods such column enlargement. This article reviews the literature on the methodology and effectiveness of utilizing FRP sheets/strips and laminates at the column/slab intersection to enhance punching shear strength of flat slabs.Polymers 2020, 12, 685 2 of 27 connection stiffness. The deflected profile in the slab compression region can be considered as straight lines, while that in the tension region shows a slight discontinuity, especially when the shear crack intersects the reinforcement. Moe [4] tested 43 slabs and investigated the results of 140 footings in addition to 120 slabs that are reported in the literature and noted the common appearance of inclined cracks at 60% of the ultimate load. These inclined cracks started from bending cracks, then rapidly extended up to the proximity of the neutral axis and finally developed rather slowly but leaving only a very narrow depth of the compression zone unaffected. During the structural design phase, if the shear capacity is exceeded, shear reinforcement can be designed to enhance the capacity. Some studies indicated that using shear reinforcement in two-way slabs may double the punching shear strength [5].Strengthening flat slabs at the column-slab juncture using externally applied material with high tensile strength did not start with the fiber reinforced polymer (FRP) sheets. Steel plates with steel anchor bolts were used successfully to increase the two-way shear strength of flat slabs. Ebead and Marzouk [6] strengthened slab-column junctions by installing on the tension side 6 mm thick American society for testing and materials (ASTM) A6 plates using 19 mm diameter ASTM A325 bolts. Steel plates increased the ultimate load of the flat slab by 45% when the applied load was central and by 122% when the specimens were subjected to both central loads and moments. The light weight, flexibility, and high tensile strength of FRP sheets and laminates make them viable alternative to steel plates. Externally bonded carbon fiber reinforced polymer (CFRP) sheets that are anchored to concrete at their ends were shown to inc...

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Section: O4 S4mentioning

confidence: 99%

Section: O4 S4mentioning

confidence: 99%

“…Polymers 2020, 12, x 13 of 28 Figure 14. One-way supporting concrete specimen strengthened with CFRP sheet covering the entire specimen except the circular loading area [37].…”

Section: O4 S4mentioning

confidence: 99%

Section: O4 S4mentioning

confidence: 99%

“…Load-displacement variation for punching of slabs for concrete grade B (SB: control slab; CFRP strengthened slab; and SB-T: TRM strengthened slab)[37].…”

mentioning

confidence: 99%

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