Lateral Torsional Buckling of Steel I-Beam Retrofitted Using FRP Sheets: Analytical Solution and Optimization

Kabir, Mohammad Zaman; Seif, A.E.

doi:10.1007/978-3-642-17487-2_202

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…Although Vlasov theory has been applied to thinwalled structural members found in buildings, aircrafts, naval, and other structures [2], there is a need for methods for reducing warping stresses developed due to torsional loading. Kabir and Seif [3] have conducted a lateral-torsional stability study of steel I-beams retrofitted with fiber reinforced polymer materials. Lee and Kim [4] investigated the lateraltorsional buckling response of thin-walled laminated channel-section beams.…”

Section: Introductionmentioning

confidence: 99%

Method for Reducing Warping Stresses in Torsionally Loaded I-Section Members using CFRP Plates

Konaté

2022

EJENG

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This paper presents a method for reducing warping normal stresses in torsionally loaded I-section members by utilizing carbon fiber-reinforced polymer (CFRP) plates. The CFRP plates are bonded to the outer surfaces of the flanges with a view to reducing warping normal stresses. The maximum warping normal stress in the flanges of a steel I-shaped member without the CFRP plates is compared to those obtained with the CFRP plates having various thicknesses. It has been found that the use of CFRP plates bonded to both flanges of the I-section result in a substantial reduction of the warping stresses. For the study presented, the maximum warping normal stress without CFRP plates drops down to merely one-third of its value when 0.625-in. thick CFRP plates are mounted on the outer surfaces of the I-section flanges.

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Section: Introductionmentioning

confidence: 99%

Method for Reducing Warping Stresses in Torsionally Loaded I-Section Members using CFRP Plates

Konaté

2022

EJENG

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“…Due to their excellent mechanical properties, fiber-reinforced polymer (FRP) composites have been used to enhance the flexural strength (Miller et al 2001;Lenwari et al 2005Lenwari et al , 2006Zhao and Zhang 2007;Schnerch and Rizkalla 2008;Teng et al 2012), lateral-torsional buckling capacity (Kabir and Seif 2011;Ghafoori and Motavalli 2015), local buckling strength (Zhao and Zhang 2007), and fatigue behavior (Colombi et al 2003a;Liu et al 2009a, b;Täljsten et al 2009;Jiao et al 2012) of steel structures. For cracked metallic structures, other fatigue crack repair methods, including the hole drilling, weld repair, use of doublers or splice plates, and posttensioning, have been used (Dexter and Ocel 2013).…”

Section: Introductionmentioning

confidence: 99%

Optimization of Fiber-Reinforced Polymer Patches for Repairing Fatigue Cracks in Steel Plates Using a Genetic Algorithm

Lenwari

2020

J. Compos. Constr.

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A practical design optimization of fiber-reinforced polymer (FRP) patches for repairing fatigue cracks in metallic structures is presented. The design procedure combines finite-element (FE), genetic programming (GP), and genetic algorithm (GA) approaches. An optimum patch design is defined as the combination of design parameters that simultaneously minimizes the patch volume and reduces the stress intensity factor (SIF) range below the fatigue threshold range. A patching correction factor, which accounts for the positive effects of material and geometric properties of the patch and adhesive layer on the SIF solution, is proposed. The correction factor is developed by performing symbolic regression via GP analyses on the SIF values obtained from the three-dimensional FE models. The closed-form SIF solution facilitates the visualization of the effects of design parameters, simplifies the calculation of fatigue life, and reduces the computation effort for design optimization. An example of the center-cracked steel plate subjected to constant amplitude fatigue loading and then repaired with double-sided adhesive-bonded FRP patches is used to illustrate the optimization procedure.

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“…In general, a proper Airy stress function proposed for an elastic or rigid media subjected to a specific loading (Gdoutos 2003, Kabir et al 2011, Seif et al 2015, Mitchell et al 2016, Alshaya et al 2017. In this specific method, the proposed function is generally dependent on the geometry of the assumed problem.…”

Section: Introductionmentioning

confidence: 99%

Implementing an Accurate Generalized Gaussian Quadrature Solution to Find the Elastic Field in a Homogeneous Anisotropic Media

Kabir¹,

Matikolaei²

2017

JSSCM

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In the current study, the elastic field in an anisotropic elastic media is determined by implementing a general semi-analytical method. In this specific methodology, the displacement field is computed as a sum of finite functions with unknown coefficients. These aforementioned functions exactly satisfy both the homogeneous and inhomogeneous boundary conditions in the proposed media. It is worth mentioning that the unknown coefficients are determined by implementing the principle of minimum potential energy. The numerical integration is done by employing the Generalized Gaussian Quadrature rule. Furthermore, and with the aid of the calculated unknown coefficients, the displacement fields as well as the other parameters of the elastic field are obtainable. Finally, the comparison of the previous analytical method with the current semi-analytical approach proposes the efficacy of the present methodology.

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Lateral Torsional Buckling of Steel I-Beam Retrofitted Using FRP Sheets: Analytical Solution and Optimization

Cited by 6 publications

References 10 publications

Method for Reducing Warping Stresses in Torsionally Loaded I-Section Members using CFRP Plates

Method for Reducing Warping Stresses in Torsionally Loaded I-Section Members using CFRP Plates

Optimization of Fiber-Reinforced Polymer Patches for Repairing Fatigue Cracks in Steel Plates Using a Genetic Algorithm

Implementing an Accurate Generalized Gaussian Quadrature Solution to Find the Elastic Field in a Homogeneous Anisotropic Media

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