Analysis of concrete columns with high-performance concrete jackets and polymer wraps

Algburi, Atheer H. M.; Sheikh, M. Neaz; Hadi, Muhammad N.S.

doi:10.1680/jstbu.19.00195

Cited by 4 publications

(5 citation statements)

References 24 publications

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“…Few studies reported in the literature were ever devoted to the theoretical investigation of the interaction efficacy of bending moment and axial force in RC columns strengthened with UHPFRC. One of the most comprehensive studies to obtain theoretical equations was the one due to Algburi et al 45 These authors, indeed, extended the equations capturing the interaction efficacy of bending moment and axial force in RC columns retrofitted via UHPFRC and FRP under eccentric loads. The final axial load in such columns is expressed by Equation () below.

N_{u} goodbreak= α_{10} normalf'_{italiccc 0} ((), A_{g} goodbreak- A_{s}) goodbreak+ α_{1 j} normalf'_{cc j} ((), A_{t} goodbreak- A_{g}) goodbreak+ A_{s} f_{sy}

where f sy is the yield stress of the longitudinal rebars, A s , A g , and A t are the cross‐sectional area of the longitudinal rebars, the column core, and the jacketed column, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Assuming that the tensile strength provided by ordinary concrete and UHPFRC may be ignored and that strain is linear, Algburi et al 45 captured the compressive force provided by ordinary concrete and the UHPFRC jacket as in Equations () and (), respectively, where the values for ∝ 20 and ∝ 2 j are calculated using Equations () and () 46

C_{c 0} goodbreak= α_{20} f'_{italiccc 0} A_{0}

C_{cj} goodbreak= α_{2 j} f'_{cc j} ((), A_{j} goodbreak- A_{j 0})

\propto_{2 j} goodbreak= 1 goodbreak- 0.003 f_{cc j}^{'} 0.67 \leq \propto_{20} \leq 0.85

\propto_{20} goodbreak= 1 goodbreak- 0.003 f_{cc 0}^{'} 0.67 \leq \propto_{20} \leq 0.85

…”

Section: Resultsmentioning

confidence: 99%

“…where, ε fe is effective FRP strain, E f is the modulus of tensile elasticity of the FRP sheet, t f , and n are the thickness of one FRP layer and the number of FRP layers, respectively. Assuming that the tensile strength provided by ordinary concrete and UHPFRC may be ignored and that strain is linear, Algburi et al 45 captured the compressive force provided by ordinary concrete and the UHPFRC jacket as in Equations ( 10) and (11), respectively, where the values for / 20 and / 2j are calculated using Equations ( 12) and ( 13). 46…”

Section: Axial Force and Bending Moment Interaction Diagrammentioning

confidence: 99%

Section: Axial Force and Bending Moment Interaction Diagrammentioning

confidence: 99%

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Behavior of RC columns strengthened with UHPFRC jackets through grooving method under eccentric loading: A comparative evaluation of steel and synthetic macro fibers in UHPFRC

Eshaghi‐Milasi

Mostofinejad

Saljoughian

et al. 2022

Structural Concrete

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This study aims to examine the behavior of reinforced concrete (RC) circular columns retrofitted with ultra‐high‐performance fiber‐reinforced concrete (UHPFRC) jackets and fiber‐reinforced polymer (FRP) wraps under concentric and eccentric loading. In the present study, for the first time, UHPFRC jackets containing synthetic macro fibers (barchip) were used. The results were then compared with those obtained by UHPFRC containing steel fibers. Moreover, to improve the effect of concrete jacketing on the column behavior under eccentric loading, the innovative interface treatment of the longitudinal grooving method (GM) was applied. For these purposes, 15 such circular columns, 120 mm in diameter and 500 mm in height, were subjected to load eccentricities of 0, 30, and 60 mm. Thus, six columns were retrofitted with UHPFRC jackets 15 mm in thickness that included both steel and synthetic macro fibers (barchip) while another six were strengthened with UHPFRC jackets and intermittent glass FRP (GFRP) warps. The experimental results revealed that load‐carrying capacity raised with the increase of the load eccentricity, as evidenced by enhancements of 283%, 303%, and 401% in the loading capacity of the specimens strengthened with UHPFRC jackets containing both GFRP warps and steel fibers for eccentricities of zero, 30, and 60 mm, respectively, relative to those of the control. In addition, enhancements of 198% and 530% were recorded respectively for ductility and energy dissipation under a loading eccentricity of zero mm in specimens retrofitted with UHPFRC jackets including steel fiber and GFRP warps when compared with the same parameters in the corresponding control specimens. Finally, a previous theoretical model was adopted to derive the axial loading‐bending moment (P–M) interaction diagrams whereby the results of the present study were satisfactorily verified.

show abstract

N_{u} goodbreak= α_{10} normalf'_{italiccc 0} ((), A_{g} goodbreak- A_{s}) goodbreak+ α_{1 j} normalf'_{cc j} ((), A_{t} goodbreak- A_{g}) goodbreak+ A_{s} f_{sy}

where f sy is the yield stress of the longitudinal rebars, A s , A g , and A t are the cross‐sectional area of the longitudinal rebars, the column core, and the jacketed column, respectively.…”

Section: Resultsmentioning

confidence: 99%

C_{c 0} goodbreak= α_{20} f'_{italiccc 0} A_{0}

C_{cj} goodbreak= α_{2 j} f'_{cc j} ((), A_{j} goodbreak- A_{j 0})

\propto_{2 j} goodbreak= 1 goodbreak- 0.003 f_{cc j}^{'} 0.67 \leq \propto_{20} \leq 0.85

\propto_{20} goodbreak= 1 goodbreak- 0.003 f_{cc 0}^{'} 0.67 \leq \propto_{20} \leq 0.85

…”

Section: Resultsmentioning

confidence: 99%

Section: Axial Force and Bending Moment Interaction Diagrammentioning

confidence: 99%

Section: Axial Force and Bending Moment Interaction Diagrammentioning

confidence: 99%

See 2 more Smart Citations

Behavior of RC columns strengthened with UHPFRC jackets through grooving method under eccentric loading: A comparative evaluation of steel and synthetic macro fibers in UHPFRC

Eshaghi‐Milasi

Mostofinejad

Saljoughian

et al. 2022

Structural Concrete

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show abstract

“…During the construction of a new masonry building or repairing old heritage structures, while using cement as a main binder in the concrete or repair material respectively, several consequences beyond the technical aspects have to be attended in this modern era. Recently, several modern techniques such as fiber reinforced jacketing [20], usage of steel threaded rods [21] are adopted for repairing the existing structures, repair in the case of ancient and historic structures need traditional based materials. Despite of these demerits associated with cement; researchers have shown attention to the lime material which is considered to be advantageous than cement.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Natural Additives Modified Lime Mortars for Repair of Historic Structures with Strength, Durability and Microstructural Parameters

James

Greeshma

2022

Period. Polytech. Civil Eng.

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The contemporary building material despite the significance of cement in construction industry is the lime mortars because of its usage as a structural repair material around the ancient heritage structures. Though the significance of lime mortars lies in the fact of compatibility towards the existing ancient lime-based structures, the method of construction and material preparations are still undisclosed. In such a case, it is necessary for the researchers to analyze scientifically, the influences of various additives towards the performance of lime mortars. This paper tries to attempt two natural additives viz., gallnut (Terminalia chebula) and palm jaggery (Saccharam officinarum) as modifiers of mixing water in the preparation of class B hydraulic lime-based mortars through the process of fermentation. Based upon the trials, 39 mixes were considered with varying water to lime ratios and dosages of additives. Experimental tests such as workability, compressive strength, water absorption, acid resistance and NaCl cyclic tests were conducted along with SEM and XRD microstructural assessments. The maximum compressive strength achieved was about 4.3 MPa which is 200% that of conventional lime mortars. Jaggery and gallnut-based additives were efficient in various durability studies however the performance of jaggery is superior to gallnut in various aspects.

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Editorial

Cashell

2022

Proceedings of the Institution of Civil Engineers - Structures

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Analysis of concrete columns with high-performance concrete jackets and polymer wraps

Cited by 4 publications

References 24 publications

Behavior of RC columns strengthened with UHPFRC jackets through grooving method under eccentric loading: A comparative evaluation of steel and synthetic macro fibers in UHPFRC

Behavior of RC columns strengthened with UHPFRC jackets through grooving method under eccentric loading: A comparative evaluation of steel and synthetic macro fibers in UHPFRC

Assessment of Natural Additives Modified Lime Mortars for Repair of Historic Structures with Strength, Durability and Microstructural Parameters

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