Strengthening of RC columns by steel angles and strips

Tarabia, Ahmed M.; Albakry, H.F.

doi:10.1016/j.aej.2014.04.005

Cited by 68 publications

(47 citation statements)

References 11 publications

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“…Their failure may lead to a partial or even a total collapse of the whole structure. The behavior of structures under cyclic loads can be used as mean of evaluating the behavior of structures using different types of strengthening [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Reinforced Concrete Strengthened Columns Under Cyclic Loading

et al. 2017

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Although many numerical investigations are available on external strengthening of reinforced concrete columns using fiber-reinforced polymer jackets, there are few numerical investigations presented on rectangular/square reinforced concrete columns subjected to cyclic lateral loading. In the present work, numerical analyses on square reinforced concrete columns strengthened using fiber-reinforced polymer and steel bars were carried out. This paper is divided into two parts. In the first part, two numerical models were presented to predict the cyclic behavior of the columns strengthened using either glass fiber-reinforced polymer or steel bars. The results of the first part showed a good accordance between the numerical modeling and the experimental laboratory tests. The second part reports a numerical investigation that evaluates the comparative behavior of reinforced concrete columns strengthened with glass fiber-reinforced polymer subjected to cyclic lateral loading, in which a parametric study related to the amount of the glass fiberreinforced polymer material wrapping with 1-3 layers was performed. The results of the parametric study revealed that although the general behaviors of the columns are slightly similar in terms of load capacity and maximal displacement, the solicitations at the glass fiber-reinforced polymer material scale and the values of the cracks corresponding to the maximum load are different. The main objectives of this numerical modeling were to provide a comparison between the numer-B Chahmi Oucif ical models and the experimental tests and to show the necessity to perform more complex numerical simulation to describe the behavior of strengthened materials in finer scale.

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Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Reinforced Concrete Strengthened Columns Under Cyclic Loading

et al. 2017

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“…Strengthened existing steel columns under preloading through welding steel plates is frequently rendered [1,2], but there is hardly any study of RC columns under preloading exists. Some researchers [3][4][5][6][7][8][9][10] reproduced the findings of an experimental test chain on some RC columns fortified with the angles of steel jacketing under axial load without preloading. ere was a witness confirming that the jacketing of steel enhances the failure load of the fortified RC columns.…”

Section: Introductionmentioning

confidence: 99%

“…Because the existing experimental research [3][4][5][6][7][8][9][10] ignores the effect of the preloading that found when the strengthening is done on the axial load capacity, reliance on the research that already exists is problematic for an accurate prediction of the axial load capacity relating to RC columns reinforced with steel jacketing under preloading. Moreover, the existing codes ACI Committee 318 [11] and Eurocode 4 [12] only predict the axial load capacity, based on the composite concrete-steel structure without preloading effect.…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of the findings derived from the parametric study, it is proposed to resort to prediction model to consider the effect of the preloading on the load capacity pertaining to steel jacketing-fortified RC columns. Moreover, experimental outcomes of tests conducted on RC columns as reflected in the literature review [3,4] were gathered to use the same for verification of the precision of the analytical results obtained through the FE program (ANSYS-15) [17].…”

Section: Introductionmentioning

confidence: 99%

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Modeling of the Axial Load Capacity of RC Columns Strengthened with Steel Jacketing under Preloading Based on FE Simulation

Sayed

Diab

2019

Modelling and Simulation in Engineering

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Reinforced concrete (RC) columns often require consolidation or rehabilitation to enhance their capacity to endure the loads applied. This paper aims at studying the conduct and capacity of RC square columns, those reinforced with steel jacketing under static preloads. For this purpose, a three-dimensional model of finite element (FE) is devised mainly to investigate and analyze the effect of this case. The model was tested and adjusted to ensure its accuracy using the previous experimental results obtained by the author. Results of testing, experimentally, the new developed FE model revealed the ability to use the model for calculating RC columns’ axial load capacity and for predicting accurate failure modes. The new model that tends to predict the axial load capacity was suggested considering the parametric analysis results.

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“…Structural steel angles for columns have been widely studied and used in various ways: (1) to externally strengthen existing RC columns with batten plates (i.e., steel jacketing for reconstruction or seismic retrofitting) (Critek 2001;Zheng and Ji 2008a, b;Montuori and Piluso 2009;Nagaprasad et al 2009;Calderon et al 2009;Badalamenti et al 2010;Garzon-Roca et al 2011a, b, 2012Campione 2012a, b;Khalifa and Al-Tersawy 2014;Tarabia and Albakry 2014;Cavaleri et al 2016); (2) to replace wideflange members with the built-up members connected by battens (Hashemi and Jafari 2004); (3) to reduce laborious fieldwork of composite columns by prefabrication (Kim et al 2011;Eom et al 2014;Hwang et al 2015Hwang et al , 2016; and/ or (4) to improve structural capacity and cost efficiency of composite columns by maximizing the contribution of highstrength steel (Kim et al , 2017. According to the primary purpose, steel angles could be either encased in concrete or exposed, and could transmit column loads or not (providing confinement only).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Load-carrying Capacity of High-strength Concrete-encased Steel Angle Columns

Kim

Hwang

2018

Int J Concr Struct Mater

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To investigate the load-carrying capacity of high-strength concrete-encased steel angle (CES-A) columns, in which corner steel angles are encased in concrete and transmit column loads directly, a numerical study was performed by using a proposed analysis model. The proposed model considered the strain compatibility, confinement effect, local buckling, and premature cover-spalling, and was verified against previous experimental study results. To investigate the effect of design parameters, a parametric study was conducted, and based on the parametric study results, a simple approach was also discussed to predict the residual strength (2nd peak load) after spalling of concrete cover at corners (1st peak load). The numerical investigations showed that when steel contribution and confinement efficiency are high, CES-A columns exhibit relatively large load-carrying capacity even after cover-spalling, due to the maintained strength of confined concrete and yielding of steel angles, and the proposed simple approach gave a good prediction for the residual strength.

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Strengthening of RC columns by steel angles and strips

Cited by 68 publications

References 11 publications

Numerical Modeling of Reinforced Concrete Strengthened Columns Under Cyclic Loading

Numerical Modeling of Reinforced Concrete Strengthened Columns Under Cyclic Loading

Modeling of the Axial Load Capacity of RC Columns Strengthened with Steel Jacketing under Preloading Based on FE Simulation

Numerical Investigation on Load-carrying Capacity of High-strength Concrete-encased Steel Angle Columns

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