Retrofitting of Rectangular Columns with Deficient Lap Splices

ElGawady, Mohamed A.; Endeshaw, Mesay; McLean, David I.; Sack, Ronald L.

doi:10.1061/(asce)cc.1943-5614.0000047

Cited by 73 publications

(31 citation statements)

References 9 publications

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“…lap length l b =20-35d b , where d b is the bar size) [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Despite the extensive researchefforts,relatively littleresearch has focusedon developing appropriate analyticalmodels for the strengthening of column splices using FRP materials.…”

Section: Introductionmentioning

confidence: 99%

Bond behaviour of substandard splices in RC beams externally confined with CFRP

Garcia¹,

Helal²,

Pilakoutas³

et al. 2014

Construction and Building Materials

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Bond splitting is investigated using flexuraltests ontwelve RCbeams with substandard laps(25 bar diameters)at midspan.Differentconfinementconfigurationsof the splice region, concrete coversand bar sizesare examined.The resultsshow thatCFRP confinement enhancesthe splicebond strength by up to 65%compared to unconfined specimens.Predictiveequationsfrom the literature are shown to yield a large scatter in results and tooverestimate the strain developedin theCFRPconfinement. Analternative approach to calculatetheconfinement strain and theadditional bond strength provided byCFRP confinementis proposedand validated.

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Section: Introductionmentioning

confidence: 99%

Bond behaviour of substandard splices in RC beams externally confined with CFRP

Garcia¹,

Helal²,

Pilakoutas³

et al. 2014

Construction and Building Materials

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“…Cantilever columns have been extensively tested in the past (Priestley et al 1992, Saadatmanesh et al 1996, Saadatmanesh et al 1997b, Saadatmanesh et al 1997a, Seible et al 1997, Xiao and Ma 1997, Haroun et al 1999, Ma and Xiao 1999, Chang et al 2000, Ma et al 2000, Chang et al 2001, Saatcioglu and Elnabelsy 2001, Haroun et al 2003, Elnabelsy and Saatcioglu 2004, Sause et al 2004, Schlick and Breña 2004, Yalçin and Kaya 2004, Bousias et al 2006, Bousias et al 2007, Breña and Schlick 2007, Youm et al 2007, Chung et al 2008, Eshghi and Zanjanizadeh 2008, Harajli 2008, ElGawady et al 2010, Bournas and Triantafillou 2011, Kim et al 2011. Column specimens are usually cast on a stiff concrete block simulating the structure's foundation, as shown in Figure 1.…”

Section: Capacity-ductility Approach: Tests On Cantilever Columnsmentioning

confidence: 99%

“…Typical applications involve bonding FRP fabric sheets or precured shells around a column to provide additional confinement (see Figure 1(a)), thus enhancing the lap bond strength and preventing a premature splitting failure. In the last decades, extensive experimental research has confirmed the effectiveness of FRP confinement at improving the behaviour of RC members with inadequate short lapped bars (Aboutaha et al 1996, Saadatmanesh et al 1996, Saadatmanesh et al 1997b, Seible et al 1997, Tastani and Pantazopoulou 2001, Bousias et al 2006, Harries et al 2006, Ghosh and Sheikh 2007, Harajli and Dagher 2008, ElGawady et al 2010, Bournas and Triantafillou 2011. Due to the large number of parameters affecting the bond behaviour of lapped bars, different experimental and analytical approaches were adopted to evaluate the effectiveness of FRP confinement.…”

Section: Introductionmentioning

confidence: 99%

Fibre-reinforced polymer strengthening of substandard lap-spliced reinforced concrete members: A comprehensive survey

Garcia

Guadagnini

Pilakoutas

et al. 2016

Advances in Structural Engineering

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Externally bonded Fibre Reinforced Polymer (FRP) confinement is extensively used to improve the bond strength of substandard lap spliced steel bars embedded in reinforced concrete (RC) components. However, the test results from bond tests on such bond-deficient components are not fully conclusive, which is reflected in the few design guidelines available for FRP strengthening. For the first time, this article presents a comprehensive survey on FRP strengthening of substandard lap-spliced RC members, with emphasis on the adopted experimental methodologies and analytical approaches developed to assess the effectiveness of FRP in controlling bond-splitting failures. The main findings and shortcomings of previous investigations are critically discussed and further research needs are identified. This review contributes towards the harmonisation of testing procedures so as to facilitate the development of more accurate predictive models, thus leading to more cost-effective strengthening interventions.

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“…The CFRP jacket was chosen as the first repair technique due to the excellent high strength-to-weight ratio which is becoming increasingly attractive for structural repair/retrofit projects (Priestley et al 1996;Buckle et al 2006;He et al 2013;Grelle and Sneed 2013). The steel jacket was the first and the most widely used retrofit technique (Priestley et al 1996;Buckle et al 2006;ElGawady 2009;Fakharifar et al 2013;), due to its availability, price, and ductile behavior when compared with FRP materials with brittle failure (Fakharifar et al 2015c). However, in addition to the labor intense work required for steel plate or RC jacketing, one major concern, is the increase of the original cross section (i.e., increased stiffness and reduced natural vibration period (Haroun and Elsanadeby 2005) results in alteration of the system dynamic response).…”

Section: Repair Techniquesmentioning

confidence: 99%

“…While numerous studies have investigated the significance and efficacy of retrofit jackets application on RC bridge columns (Priestley et al 1996;Buckle et al 2006;Vosooghi and Saiidi 2012;Fakharifar et al 2014a;He et al 2013;ElGawady et al 2009;Saatcioglu and Yalcin 2003 amongst many others), this study is a preliminary attempt to investigate the efficacy of different repair jackets application on MS-damaged RC bridge piers subjected to AS attacks of multiple intensities. Study by Huang and Andrawes (2014) indicated very promising results that an improvement as high as 117 % in bridge overall performance subjected to real strong mainshock-aftershock sequences can be achieved through applying SMA confinement to piers.…”

Section: Introductionmentioning

confidence: 99%

Collapse Vulnerability and Fragility Analysis of Substandard RC Bridges Rehabilitated with Different Repair Jackets Under Post-mainshock Cascading Events

Fakharifar

Chen

Dalvand

et al. 2015

International Journal of Concrete Structures and Materials

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Past earthquakes have signaled the increased collapse vulnerability of mainshock-damaged bridge piers and urgent need of repair interventions prior to subsequent cascading hazard events, such as aftershocks, triggered by the mainshock (MS). The overarching goal of this study is to quantify the collapse vulnerability of mainshock-damaged substandard RC bridge piers rehabilitated with different repair jackets (FRP, conventional thick steel and hybrid jacket) under aftershock (AS) attacks of various intensities. The efficacy of repair jackets on post-MS resilience of repaired bridges is quantified for a prototype two-span singlecolumn bridge bent with lap-splice deficiency at column-footing interface. Extensive number of incremental dynamic time history analyses on numerical finite element bridge models with deteriorating properties under back-to-back MS-AS sequences were utilized to evaluate the efficacy of different repair jackets on the post-repair behavior of RC bridges subjected to AS attacks. Results indicate the dramatic impact of repair jacket application on post-MS resilience of damaged bridge piers-up to 45.5 % increase of structural collapse capacity-subjected to aftershocks of multiple intensities. Besides, the efficacy of repair jackets is found to be proportionate to the intensity of AS attacks. Moreover, the steel jacket exhibited to be the most vulnerable repair intervention compared to CFRP, irrespective of the seismic sequence (severe MS-severe or moderate AS) or earthquake type (nearfault or far-fault).

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Retrofitting of Rectangular Columns with Deficient Lap Splices

Cited by 73 publications

References 9 publications

Bond behaviour of substandard splices in RC beams externally confined with CFRP

Bond behaviour of substandard splices in RC beams externally confined with CFRP

Fibre-reinforced polymer strengthening of substandard lap-spliced reinforced concrete members: A comprehensive survey

Collapse Vulnerability and Fragility Analysis of Substandard RC Bridges Rehabilitated with Different Repair Jackets Under Post-mainshock Cascading Events

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