Corroded RC Beams at Service Load before and after Patch Repair and Strengthening with NSM CFRP Strips

Triantafyllou, Garyfalia G.; Rousakis, Theodoros; Karabinis, Athanasios I.

doi:10.3390/buildings9030067

Cited by 23 publications

(7 citation statements)

References 42 publications

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“…The Crisafulli model [32] is extensively used for masonry infilled panels and implemented in the SeismoStruct software used in this simulation. The RC beams in the buildings were assumed to be noncorroded beams, so there was no need to replace the cracked concrete substrate with high-strength polymer-modified cementitious mortar before strengthening [33].…”

Section: Retrofitting Asymmetric Reinforced Concrete Frame Buildings: a Worst-case Scenariomentioning

confidence: 99%

Seismic Retrofitting of Irregular Pre-80s Low-rise Conventional RC Building Structures

Lie

Utomo

et al. 2021

ced

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A resilience and seismic safety evaluation method of under-qualified concrete structures designed based on codes prior to the introduction of earthquake provisions is presented. A numerical method for evaluating and improving a structure’s performance and resilience through jacketing and Carbon Fiber Reinforced Polymers (CFRP) retrofitting was developed. The model analyzed the structure’s existing condition, inadequate elements were identified, and segments that required strengthening were determined. Retrofitting and external reinforcing techniques were applied, and their effectiveness evaluated. Elements identified as insufficient were subjected to a strengthening iteration process to ensure that all qualifications were fulfilled. It was proven that the numerical simulation was accurate, cost-effective and time-saving in evaluating deficient structures and the effectiveness of their strengthening methods. The numerical model and analysis in conjunction with the technology of jacketing and CFRP retrofitting provide a fast and straightforward solution for older structures in ameliorating their resilience and overall performance

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Section: Retrofitting Asymmetric Reinforced Concrete Frame Buildings: a Worst-case Scenariomentioning

confidence: 99%

Seismic Retrofitting of Irregular Pre-80s Low-rise Conventional RC Building Structures

Lie

Utomo

et al. 2021

ced

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“…The soil condition is an essential component that must be addressed for FRP piles because piles are used to support massive constructions, yet most of the works discussed over FRP piles and do not include soil effects. In reality, there are fewer studies on FRP heaps than on traditional piles [30][31][32][33][34][35][36], and even fewer studies evaluate the influence of soil when examining FRP piles. The research among FRP piles with varying load regimes is not necessary, leaving a gap [35].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of reinforced concrete piles wrapped with fibre reinforced polymer under vertical load

Jose

Khazaleh²,

Prakash³

et al. 2023

Matéria (Rio J.)

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This research mainly focuses on the nature of Fiber-Reinforced Polymers (FRP) wrapped piles for the axial compression load. Normally, the degradation of Reinforced Cement Concrete (RCC) structures occurred due to corrosion, inadequate quality materials, aging, live load increments, fatigue, damages and deterioration, and so forth. RCC pile foundations are commonly affected by the above reasons. So, these structures can be strengthened with suitable methods such as jacketing, stitching, overlaying, sealing, grouting, coating, Near Surface Mounted (NSM) systems, FRP wrapping, repairing, and blanketing. FRP wrapping is well suited for strengthening pile structures because of its easy application, and this method is done without using heavy tools and skilled labor. Due to its being non-metallic, FRP reinforcing has desirable properties such as high resistance to chemicals as well as heat, flexibility, large tensile strength, permeability, and also no oxidation. Thus, FRP wrapping was selected as the chosen approach for this ongoing research. In this study, we apply an axial compression load as well as a skin friction condition to a pile member that has been modified to assess its performance and behavior.

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“…The results showed that using steel plates to strengthen corroded beams enhanced both load‐carrying capacity and ductility. Triantafyllou et al 31 studied experimentally the performance of corroded RC beams strengthened with near‐surface mounted (NSM) CFRP plate. In general, the results showed that the failure load of corroded beams improved due to the use of the NSM strengthening system.…”

Section: Introductionmentioning

confidence: 99%

Strategies for strengthening of corroded reinforced concrete beams using CFRP laminates and UHPC jacketing

Al‐Osta

Kharma

Ahmad

et al. 2022

Structural Concrete

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This article aims to investigate the flexural behavior of strengthened corroded reinforced concrete (RC) beams using carbon fiber‐reinforced polymer (CFRP) laminates and using a hybrid system of CFRP laminates and ultrahigh‐performance concrete (UHPC) layers. A total of 15 RC beam specimens were prepared, out of which one specimen was uncorroded–unstrengthened, and 14 specimens were corroded using accelerated corrosion set up to cause a significant reduction in the load‐carrying capacity of the RC beams. The damaged covers of the corroded RC beam specimens were first repaired and then strengthened with different strengthening strategies involving CFRP laminates alone as well as the CFRP laminates and UHPC jacketing together. The experimental results obtained by testing the strengthened RC beam specimens in flexure showed a significant enhancement in the load‐carrying capacity and stiffness of the strengthened corroded RC beams. The number of CFRP laminates, hybridization of the CFRP laminates and UHPC layer, and the thickness of the UHPC layer all significantly improved the load‐carrying capacity and stiffness of the strengthened corroded RC beams indicating the possibility of selecting an optimal strategy out of different options for strengthening the corroded beams to achieve a targeted degree of the efficacy of the strengthening. The analytical model developed in this study to estimate the flexural capacity of the strengthened RC beams was found to predict the values of the load‐bearing capacity of the RC beams strengthened using different strategies very close to their respective experimental values.

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Corroded RC Beams at Service Load before and after Patch Repair and Strengthening with NSM CFRP Strips

Cited by 23 publications

References 42 publications

Seismic Retrofitting of Irregular Pre-80s Low-rise Conventional RC Building Structures

Seismic Retrofitting of Irregular Pre-80s Low-rise Conventional RC Building Structures

Experimental study of reinforced concrete piles wrapped with fibre reinforced polymer under vertical load

Strategies for strengthening of corroded reinforced concrete beams using CFRP laminates and UHPC jacketing

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