Torsional Repair of Severely Damaged Column Using Carbon Fiber-Reinforced Polymer

He, Ruili; Sneed, Lesley; Belarbi, Abdeldjelil

doi:10.14359/51686627

Cited by 27 publications

(5 citation statements)

References 11 publications

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“…The concrete jacketing method has advantages for improving the strength and stiffness of old columns. He et al [ 24 ] expressed the torsional stiffness attenuation using the relationship between

and twist. Here,

denotes the torsional stiffness at the i-th drift ratio and

denotes the initial torsional stiffness determined from the first loading cycle.…”

Section: Resultsmentioning

confidence: 99%

An Experimental Study on Torsional Behavior of Reinforced Concrete Columns Retrofitted with Hybrid Concrete Jackets

Kim

Lee

2023

Materials

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The concrete jacketing method for retrofitting old reinforced concrete (RC) columns should secure confinement and seismic performance under torsion as well as unidirectional later loads. In a previous study, a hybrid concrete jacketing method was proposed using steel wire mesh (SWM), steel grid reinforcement (SGR), which can replace reinforcement of existing concrete jacketing method, and using steel fiber non-shrinkage mortar (SFNM). These details can simplify the retrofitting process of the existing concrete jacketing method, and seismic performance was evaluated by conducting a cyclic loading test under unidirectional loading. In this paper, the torsional behavior of RC columns retrofitted with the hybrid concrete jacketing method was investigated. Four specimens were fabricated and conducted cyclic loading tests under two types of loading schemes, unidirectional and bidirectional loading, to examine the effect of the loading path. The strength and energy dissipation capacity of retrofitted columns with hybrid concrete jackets increased approximately eight times compared to the old RC columns under torsional loading. Therefore, the hybrid concrete jacketing method can improve torsional resistance.

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and twist. Here,

denotes the torsional stiffness at the i-th drift ratio and

denotes the initial torsional stiffness determined from the first loading cycle.…”

Section: Resultsmentioning

confidence: 99%

An Experimental Study on Torsional Behavior of Reinforced Concrete Columns Retrofitted with Hybrid Concrete Jackets

Kim

Lee

2023

Materials

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“…CFRP sheets are also used to repair damaged RC elements under torsion. After tests were made 56 , it was shown that the torsional capacity of columns was larger than the original torsional strength, after they were repaired with CFRP A sw,min = minimum area of transverse torsion reinforcement, A t = area of one leg of a closed stirrup resisting torsion, A t,min = minimum area of transverse reinforcement for torsion, A v = required area of shear reinforcement. Required area of two legs of a closed stirrup for shear, A v,min = minimum transverse reinforcement for shear force, E p = modulus of elasticity of prestressing tendons , E s = modulus of elasticity of non-prestressed reinforcement, F cr = absolute value of the tensile force within the flange immediately prior to cracking due to the cracking moment calculated with f ct,eff , F p = the prestressing force, G = shear modulus, K = the effective length factor for compression members , M f = moment due to factored loads , M p,ind = secondary moment caused by prestressing, M u = factored applied moment, M Ed = design bending moment, M Ed0 = bending moment without the effect of prestressing, N Ed = axial force at the serviceability limit state acting on the part of the cross -section under consideration (compressive force positive), resulting from the characteristic values of prestress and axial forces under the relevant load combinations , N Ed,MC = applied axial force, positive for tension and negative for compression , N Ed0…”

Section: Discussionmentioning

confidence: 99%

Overview of Torsion Design Methods

2020

SP-344: Examples for the Design of Reinforced and Prestressed Concrete Members Under Torsion

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Large torsional moments, which need to be considered in a design, can result among others, in structures with an asymmetric layout or loading. To find the required longitudinal and transverse reinforcement to resist these torsional moments, the link between the three-dimensional action of the torsional moment and sectional analysis methods is necessary. This paper reviews the existing methods and code provisions for torsion. First, an overview of the principles of torsion from the mechanics perspective is given. Then, a survey of the available mechanical models for torsion is presented. Finally, the code provisions for torsion of ACI 318-19, CSA-A23.3-04, AASHTO-LRFD-17, EN 1992-1-1:2004, and the fib Model Code 2010 are summarized. Additionally, current research topics on torsion in structural concrete are summarized. It is expected that with this paper, engineers will have a useful overview and background knowledge for the design and assessment of torsion -critical elements.

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“…The rehabilitation of RC bridge columns without fractured longitudinal rebars usually refers to bridge columns with small to moderate damage; rehabilitation results in adequate strength capacity without external reinforcement systems but obtains reduced stiffness (French et al 1990;Lehman et al 2001) or has adequate external reinforcement systems, such as RC jackets (Bett et al 1988;Kunwar et al 2021), steel jackets (Chai et al 1991;Zhang et al 2021), fiber-reinforced polymer (FRP) jackets (Chang et al 2004;Elsouri and Harajli 2011;He et al 2013bHe et al , 2014Li and Sung 2003;Priestley and Seible 1993;Saadatmanesh et al 1997;Sheikh and Yau 2002;Vosooghi et al 2008), near-surface mounting (NSM) of carbon fiber-reinforced polymer (CFRP) laminate systems or hybrid CFRP systems (Chellapandian and Prakash 2018), grooving and corner strip-batten reinforcement (Saljoughian and Mostofinejad 2020), and shape memory alloys (SMAs) (Shin and Andrawes 2011), which recover the bridge column strength and often the stiffness as well. Rehabilitation with external RC jackets may require a relatively long time to cure, as well as considerable labor.…”

Section: Literature Reviewmentioning

confidence: 99%

Rebar Replacement in Severely Damaged RC Bridge Column Plastic Hinges: Design Criteria and Experimental Investigation

et al. 2023

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This paper presents a procedure for rehabilitating plastic hinges with damaged/fractured weldable longitudinal rebars in severely damaged reinforced concrete (RC) bridge columns and possible improvements regarding connection protection and plastic hinge development. Damaged/fractured longitudinal rebars are replaced with new rebar segments, and the basis of this approach involves connecting intermediate machined parts to the original longitudinal rebars by welding with an off-the-shelf steel equal angle. The proposed rehabilitation design procedure is based on capacity design principles, with equations that define the new geometries and required ductility, and it is validated experimentally on three 1∶6-scale RC circular column specimens. Compared with the original columns, the ductility capacity of the rehabilitated columns increased from 39% to 58%, and the energy dissipation (equivalent viscous damping ratio) increased from approximately 50% to 250%. The base shears of the rehabilitated columns were smaller than those of the original columns owing to the reduction in the rebar area; thus, shear failure was avoided, and the demand on the foundation was reduced. The rehabilitation procedure, by adopting a welding connection that is easily performed on site and concentrates the damage in the new rebar segments, promises to be a quick, simple, reliable, and effective means to improve the ductility and shear capacity of RC bridge columns without using mechanical couplers or changing the column dimensions.

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Torsional Repair of Severely Damaged Column Using Carbon Fiber-Reinforced Polymer

Cited by 27 publications

References 11 publications

An Experimental Study on Torsional Behavior of Reinforced Concrete Columns Retrofitted with Hybrid Concrete Jackets

An Experimental Study on Torsional Behavior of Reinforced Concrete Columns Retrofitted with Hybrid Concrete Jackets

Overview of Torsion Design Methods

Rebar Replacement in Severely Damaged RC Bridge Column Plastic Hinges: Design Criteria and Experimental Investigation

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