Improvement of punching shear strength of reinforced lightweight concrete flat slab using different strengthening techniques

Said, Mohamed; Adam, Maher A.; Arafa, Alaa E.; Moatasem, Ahmed

doi:10.1016/j.jobe.2020.101749

Cited by 15 publications

(8 citation statements)

References 17 publications

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“…This is ascribed to their smaller axial stiffness compared to steel bars [ 35 ]. GFRP bars also possess the advantage of being cheaper than composite materials made up of carbon or aramid [ 36 , 37 , 38 ].…”

Section: Introductionmentioning

confidence: 99%

“…GFRP was compared to steel reinforcement as shear reinforcement, and it was concluded to have comparable improvements in punching shear strength [ 40 ]. Other studies also incorporated GFRP reinforcement as a replacement of steel reinforcement and concluded to have parallel enhancements in punching shear strength of flat slabs together with the alteration of failure mode from shear to flexure [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ]. Till now, GFRP bars have shown substantial potential as a suitable alternative to conventional steel shear reinforcement in flat slabs [ 34 , 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

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Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods

et al. 2021

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The results of an experimental program on shear-strengthening of flat slabs using Glass Fiber Reinforced Polymer (GFRP) rods are presented. A total of seven specimens were tested under an upward concentric monotonic loading until failure. One specimen served as a control and was tested without any modification. The remaining six specimens were strengthened with post-installed GFRP rods in single (SG), double (DB), and radial (RD) patterns within shear critical parameters around the centric column. The results of this experimental study suggest that GFRP rods are capable of enhancing both the peak load and deformation capacity. Furthermore, brittle failure associated with punching shear failure was successfully avoided by all strengthening patterns. Of all of the patterns, the RD pattern resulted in maximum peak load increase and corresponding deformation capacity while the lowest bound was created by the SG pattern. The results suggested that SG, DB and RD patterns enhanced ultimate loads up to 9.1, 11.3 and 15.7% while corresponding deflections increased up to 109, 136 and 154%. Strain measurement on flexural reinforcement suggested that all strengthened specimens were able to withstand higher longitudinal strains than yield. It was further shown that reducing the spacing between the GFRP rods efficiently enhanced peak loads, nevertheless, neither this change was proportional, nor did it result in an enhanced energy dissipation capacity. In the end, recommendations of American Concrete Institute (ACI) for the shear strength of two-way systems were modified to incorporate the contributions from GFRP rods. The results indicate that the proposed analytical approach provides an excellent match with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods

et al. 2021

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“…El-Kashifet al [11] used Carbon Fiber Reinforced Polymer (CFRP) and concluded that experimental results showed remarkable agreement with ECP 203-2020 code [6], ACI-318-19 code [2] and JSCE-2010code [8]. Said et al [12] used Glass Fiber Reinforced Polymer (GFRP), bolts and steel bars. The predictions of ACI 318-19code [2] were underestimated while Euro code 2 [4] showed good agreement with experimental results.…”

Section: Introductionmentioning

confidence: 99%

PROPOSED CORRECTION FACTORS for PUNCHING SHEAR CAPACITY of RC FLAT SLABS with SHEAR REINFORCEMENT

ELGHIT

Mahmoud

El-Mahdy

et al. 2022

Engineering Research Journal - Faculty of Engineering (Shoubra)

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Punching shear is the main problem facing reinforced concrete (RC) flat slabs. There are many studies that investigate the punching shear of flat slabs in the normal cases, while there are very few studies that investigate circular flat slabs supported on circular columns. This paper investigates the effect of: (1) steel shear studs; (2) steel stirrups; (3) main reinforcement details and (4) shear reinforcement arrangement on the punching shear resistance of circular RC flat slabs. An experimental program was conducted by the authors and the obtained results are compared with the numerical results using ANSYS V. 15, as well as the analytical results using the American and the Egyptian codes of standards. The obtained results show that punching shear strength increased when using steel shear reinforcement (studs and stirrups) by 9% to 57%.Toughness and displacement ductility improved by 31% to 333% and 85 to 121%, respectively. Both codes overestimate the ultimate failure load for the range of the studied variables in this research and not in general.

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“…Previous studies [15][16][17][18][19][20][21][22] reported the efect of carbon fber on the strength, toughness, and thermal conductivity of lightweight aggregate concrete. Previous studies [22][23][24][25][26] reported analyzed the strength, impact, and shear properties of glass fber LAC. But because of the high price of steel fber and poor dispersion in the cement matrix, the complex manufacturing process of carbon fber, and the alkali resistance of glass fber in the cement matrix, problems such as sexuality restrict the application in practical engineering.…”

Section: Introductionmentioning

confidence: 99%

Static and Dynamic Compression Performances of Hybrid Fiber‐Reinforced Lightweight Aggregate Concrete

Zhou¹,

Chen²

2022

Advances in Civil Engineering

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In this study, basalt fiber and polypropylene fiber with different volume ratios were mixed into lightweight aggregate concrete (LAC), and the static compressive strength and dynamic compressive performance of LAC mixed with fiber were tested. The influence of basalt fiber and polypropylene fiber on the stress-strain relationship and energy conversion relationship of LAC was analyzed. The results show that basalt fiber and polypropylene fiber with an appropriate volume ratio are beneficial to enhance the strength and toughness of LAC, but the mixing effect is better. When the volume ratio of mixed fibers is 0.2%, the compressive strength, elastic modulus, peak strain, and ultimate strain are increased by 61.9%, 23.57%, 32.81%, and 45.14%, respectively, compared with the LAC without fibers. Based on the statistical damage theory, the compressive damage constitutive model of fiber LAC is established; fiber improves the ductility and energy absorption capacity of LAC and shows better impact resistance. Finally, based on modern SEM microscopic testing technology and EDS testing technology, the internal structure and chemical element composition of ordinary LAC and fiber lightweight aggregate were compared and analyzed. The internal compactness of the aggregate concrete improves the strength and toughness of the lightweight aggregate concrete, which reveals the mechanism of the fiber on the LAC from a microscopic point of view.

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Improvement of punching shear strength of reinforced lightweight concrete flat slab using different strengthening techniques

Cited by 15 publications

References 17 publications

Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods

Remediation of Punching Shear Failure Using Glass Fiber Reinforced Polymer (GFRP) Rods

PROPOSED CORRECTION FACTORS for PUNCHING SHEAR CAPACITY of RC FLAT SLABS with SHEAR REINFORCEMENT

Static and Dynamic Compression Performances of Hybrid Fiber‐Reinforced Lightweight Aggregate Concrete

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