Improved confinement of reinforced concrete columns

El-Kholy, Ahmed M.; Dahish, Hany A.

doi:10.1016/j.asej.2015.06.002

Cited by 37 publications

(18 citation statements)

References 8 publications

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“…22 and 23. This result agrees with the research introduced by El-Kholy and Dahish [22], which showed a significant improvement in the ultimate load of the RC columns by using steel mesh as internal confinement.…”

Section: Load Versus Vertical Shortening Curves and Maximum Loadsupporting

confidence: 92%

“…Additionally, the strengthened specimens showed lower lateral displacements and higher ultimate load than the unstrengthened specimens because of the confinement effect using SSWM, which was more economical compared to using FRP. El-Kholy and Dahish [22] proposed an actual confinement arrangement consisted in using one layer of expanded mesh that was warped over the stirrups, which were used with different volumetric ratios in square RC columns. The confined columns showed higher plastic deformation, larger failure load, superior ductile performance, a greater capacity of energy absorption, and a larger decrease in the stirrups volumetric ratio compared to the unconfined columns.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of circular RC columns using steel mesh as internal or external confinement under the influence of axial compression loading

Emara

Rizk

Mohamed

et al. 2021

Frattura Ed Integrità Strutturale

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Reinforced concrete (RC) columns cannot get supreme confinement by using the customary steel stirrups reinforcement because of the requirements for the spacing distances between the stirrups in addition to concrete continuance trouble. For this, Steel Mesh (SM) externally wrapped around the outer perimeter of the column as contributory confinement are being widely used due to its features. Limited tests focused on using SM for the internal confinement around the reinforcing cage of RC columns. Moreover, no experimental comparison was presented between RC columns internally and externally confined using SM. This paper investigates experimentally the behavior of circular RC columns confined internally or externally by SM. Six short RC columns have been subjected to axial loading until failure. The main studied parameters were SM schemes, number of SM wraps, SM position (internally or externally), and the steel stirrups existence. Results demonstrated that SM could decrease the crack opening, diminish the concrete spalling, increase the maximum failure load, and enhance the ductility, energy absorption, and column stiffness. Furthermore, the partially internal confinement using two wraps of SM around the steel ties presented the maximum capacity with reasonable ductility. In general, internally confined columns showed better behavior than the externally confined one.

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Section: Load Versus Vertical Shortening Curves and Maximum Loadsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Enhancement of circular RC columns using steel mesh as internal or external confinement under the influence of axial compression loading

Emara

Rizk

Mohamed

et al. 2021

Frattura Ed Integrità Strutturale

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“…Equations for calculating the capacity of the columns were proposed. El-Kholy and Dahish [22] reinforced sixteen short square RC column specimens of slenderness ratios k = 7.33 and 14 laterally with various volumetric ratios of ties. The confinement of twelve column specimens was enhanced by warping single expanded metal mesh layer around the ties.…”

Section: Introductionmentioning

confidence: 99%

Strengthening of reinforced concrete short columns using ferrocement under axial loading

Mabrouk

Awad²,

Abdelkader³

et al. 2022

Journal of Engineering Research

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Reinforced concrete columns play an important role in distributing loads from slabs and beams to foundations. As a result of time, fatigue, or other factors, the reinforced columns are exposed to deterioration, and it is required to strengthen or repair these columns. Ferrocement jacketing can be considered as an easy and cheap method which has a significant effect on strengthening members. The main objective of this research is to study the effect of strengthening short columns using ferrocement jackets. Fourteen short square columns having the same dimensions were tested under axial loading. One column was designed as a control specimen and the other thirteen specimens were strengthened with ferrocement while changing the type and number of layers. It was found that using ferrocement as strengthening method increased the strength of columns in average from 11 to 40 %. Following that, a finite element analysis was conducted using the tested column specimens to further assess the usage of ferrocement jackets for strengthening concrete columns. A modified equation was proposed to calculate the capacity of short square columns strengthened using ferrocement jackets. Comparison with experimental data showed that the proposed equation gives good correlation compared to the experimental data.

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“…Other relatively low tensile strengths of materials i.e. polyethylene/PE fibers (240 MPa) and wire mesh (320 MPa) have also been used to produce textile reinforcements [12][13]. Off course high tensile strength is beneficial to obtain high strength-high ductility of TRC as compared to those of fibers with low tensile strength.…”

Section: Introductionmentioning

confidence: 99%

“…higher than C (13%) but lower than AR glass (33%). Other researchers [12][13] used wire mesh as reinforcement of mortar in a similar manner to that of TRC.…”

Section: Introductionmentioning

confidence: 99%

Effect of cantala fiber as textile reinforcement on the flexural behaviour of polymer modified mortar

Purwanto¹,

Kristiawan²,

Santosa³

et al. 2017

MATEC Web Conf.

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Abstract. Cantala (Agave cantala), plant of the family Asparagaceae and its fibers, belongs to the leaf fibers group. These fibers are made into coarse twines at about 1.2 mm in diameter. The yarns of the cantala fiber are then interwoven to create textile reinforcements at two meshing size i.e. 5 x 20 mm and 10x20 mm. The textiles are used to reinforce polymer modified mortars to improve flexural properties of the mortars. This research aims to investigate the effect of textile reinforcement made from cantala fiber on the flexural behaviour of polymer modified mortar especially its strain hardening response. The parameters to be observed include strength, stiffness, thoughness, ductility and residual strength. The effect of the meshing size of the textile reinforcement on those properties are assesed. In addition, the efficacy of the cantala fiber textile reinforcement to improve the flexural properties of polymer modified mortar is compared with textile reinforcement made from wire mesh. The results indicate that an inclusion of short fibers could alter the post-peak behaviour of the mortar from brittle to ductile failure with softening response. Futher reinforcement of this mortar with cantala fiber textile would turn the softening response to a strain hardening response. The presence of cantala fiber textile reinforcement has minor effect on the flexural strength and stiffness. However, it significantly improve the thoughness, ductility and residual strength of the mortar. Cantala fiber textile reinforcement with a meshing size of 5x20 mm gives a greater increase on those post-peak properties compared to the the one with a meshing size of 10x20 mm. When comparison is made to the wire mesh, both cantala fiber textile reinforcements show a better properties.

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Improved confinement of reinforced concrete columns

Cited by 37 publications

References 8 publications

Enhancement of circular RC columns using steel mesh as internal or external confinement under the influence of axial compression loading

Enhancement of circular RC columns using steel mesh as internal or external confinement under the influence of axial compression loading

Strengthening of reinforced concrete short columns using ferrocement under axial loading

Effect of cantala fiber as textile reinforcement on the flexural behaviour of polymer modified mortar

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