Experimental and numerical analysis of composite beams strengthened by CFRP laminates in hogging moment region

Elshihy, Ashraf; Fawzy, Hesham; Mustafa, Suzan; El‐Zohairy, Ayman

doi:10.12989/scs.2010.10.3.281

Cited by 10 publications

(4 citation statements)

References 7 publications

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“…In the study they exhibited increase in moment capacity and the location *Corresponding Author (Sorumlu yazar) e-posta : emre.ercan@ege.edu.tr of de-bonding between CFRP sheets and steel under heavy loads. El-Shihy et al [10], conducted an experiment and a nonlinear FEM analysis on the behavior of steel-concrete composite beams strengthened in hogging moment region with CFRP sheets. Experimental results showed strengthening steel-concrete composite beams with concrete slab with CFRP sheets with one and two layers increased the load carrying capacity of the beam by 15% and 21%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of a CFRP Strengthened Steel-Concrete Composite Beam

Ercan¹,

Arısoy²,

Hökelekli³

2018

Journal of Polytechnic

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Bu makaleye şu şekilde atıfta bulunabilirsiniz(To cite to this article): Ercan E., Arısoy B. ve Hökelekli E., "Experimental and numerical analysis of a CFRP strengthened steel-concrete composite beam", Politeknik Dergisi, 21(1): 113-121, (2018).Erişim linki (To link to this article): http://dergipark.gov.tr/politeknik/archive DOI: 10.2339/politeknik.385920 Politeknik Dergisi, 2018;21(1):113-121 Journal of Polytechnic, 2018;21(1):113-121 ABSTRACTIn this study, experimental and nonlinear finite element analysis of strengthened steel-concrete composite beams is presented. A steel-concrete composite beam is produced by using a steel beam and concrete slab bonded each other with shear connectors. Strengthening is applied by Carbon Fiber Reinforced Polymers (CFRP) sheets to the lower flange of the steel beam. Three samples are prepared, one of them is considered as a reference sample, the other two are strengthened by CFRP sheets with different number of layers. In experimental study, steel-concrete composite beams were tested by 4-point bending test with cyclic loading. During the test, load, deflection, and strain values are measured. Then 3D finite element models of the steel-concrete composite beams are prepared using tetrahedral elements. Finite element analysis is performed by using ATENA nonlinear analysis program. The results of experiments and finite element analysis are compared. Results indicated that the strengthened steel-concrete composite beams have larger moment capacity, lower deflection that the steel-concrete composite beam sample. Some evaluations are made on especially in terms of strength, applicability, stiffness and energy consumption about the steel-concrete composite beams with CFRP. Experimental results are found similar to the results obtained by nonlinear finite element method. Keywords: CFRP, strengthened steel-composite beam, 4-point loading test, FEMHigh speed processing of ferrous or non- INTRODUCTIONThe bearing system mentioned that produced as a result of merging reinforced concrete slabs and the steel beams with shear elements (shear connectors) is called a steelconcrete composite beam (Figure 1). These systems are more economical than steel beams that bear alone the concrete slab that sits freely on them. This is because in steel-concrete composite beams the tension component of the force pair originating from bending is carried by the steel profile, and the compressive component is carried only by the concrete slab or jointly with upper portion of the steel beam. Therefore, a steel profile that is weak against buckling is relieved entirely or to a large extent from carrying the compressive component of bending.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of a CFRP Strengthened Steel-Concrete Composite Beam

Ercan¹,

Arısoy²,

Hökelekli³

2018

Journal of Polytechnic

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“…Certain composite structural systems able to realize long-span structures, including S-SRC Bar, EcoPrestressed Concrete Beams, The SEN Steel Concrete beams of various types have also been conducted (El-Shihy et al, 2010;G o rkem and H u sem, 2013;Li et al, 2014;Shanmugam and Min, 2007;Vu et al, 2013;Zhu et al, 2013). However, since the structural systems mentioned above need a high level of construction technology and still have limits in terms of constructability, they have not been aggressively applied to practical construction projects so far.…”

Section: Introductionmentioning

confidence: 99%

“…The TSC method (Figure 1(c)), which employs “U-shaped” steel girders and concrete, can improve the weak flexural rigidity of steel girders filled with concrete and integrated with concrete slabs. Beyond these methods, many previous studies on the structural performance of structural systems with steel beams of various types have also been conducted (El-Shihy et al, 2010; Gőrkem and Hűsem, 2013; Li et al, 2014; Shanmugam and Min, 2007; Vu et al, 2013; Zhu et al, 2013). However, since the structural systems mentioned above need a high level of construction technology and still have limits in terms of constructability, they have not been aggressively applied to practical construction projects so far.…”

Section: Introductionmentioning

confidence: 99%

Structural performance of composite double beam system

Lee¹,

Kim

Lee

et al. 2016

Advances in Structural Engineering

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A new composite structural system that is able to enhance constructability and is suitable for realization of long-span structures was developed. Steel beams, steel reinforced concrete columns, reinforced concrete drop panels, and slabs are placed in the system. To determine the structural performance of the system, the gravity and lateral load resisting properties of the system were investigated. It was found that the presence of a reinforced concrete drop panel at the top of a column brings about a reduction of the negative moment at the top of the column. Also, it was observed that a reinforced concrete drop panel on the top of the column significantly affected the deflection-control of the beam. In a lateral load resisting test, cracks in slabs of the new structural system disperse in a better manner than is the case for crack patterns in the conventional composite system. Also, via push-over analysis using a package of structural analysis software, it was found that the developed structural system is effective in the prevention of stress concentration in the column zone.

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“…Failure in the case of RC beams may take place through concrete crushing before yielding of the reinforcing steel, steel yielding followed by FRP rapture; steel yielding followed by concrete crushing, cover delamination; and/or FRP debonding. Shihy et al [29] reported that strengthening composite beams and concrete slabs strengthened with CFRP sheets increased the load carrying capacity of the beam by 15%. This increase was related to the thickness of the CFRP sheet; doubling the sheet thickness increased the ultimate capacity of the beams to 21%.…”

Section: Cfrp Advantages and Disadvantagesmentioning

confidence: 99%

Behavior of Concrete Beams with Corroded Reinforcement Retrofitted with Carbon Fiber Reinforced Polymer

Lingga¹

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Severe premature deterioration has been reported in a large number of reinforced concrete (RC) structures in corrosive environments. Many concrete structures built in the past few decades are already showing signs of deterioration due to the corrosion of steel reinforcement. This premature deterioration can diminish structural integrity and safety of the structure. There are several options available for retrofitting the structural members of existing reinforced concrete (RC) structures. Bonding thin steel plates is one of the common methods of retrofitting. Though the technique is successful in practice, the added steel plates are susceptible to corrosion, which leads to an increase in future maintenance costs. Therefore, attention has shifted to the use of carbon fiber reinforced polymer (CFRP) as alternative material. Based on previous studies, bonding CFRP sheets to the damaged members helps increase load carrying capacity, ductility, and stiffness of the damaged structure. Such a technique is an effective way to improve the flexural and shear performance of the RC damaged structure. In this experimental study, CFRP materials were used for structural strengthening. CFRP materials do not corrode because they are a combination of carbon fibers and an epoxy resin matrix. Moreover, they have very high strength and rigidity in the fiber direction. The project focused on retrofitting RC beams that contained corroded steel, considering an extreme case of corrosion. The steel in RC beams were assumed to be fully corroded, resulting in the most severe loss in steel cross-section and strength. Unidirectional CFRP sheets were used to strengthen the deteriorated RC beams. This type of retrofitting increases the load carrying capacity of the corrosion damaged RC beams. It also increases the flexural and fatigue strength of the damaged RC beam.

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Experimental and numerical analysis of composite beams strengthened by CFRP laminates in hogging moment region

Cited by 10 publications

References 7 publications

Experimental and Numerical Analysis of a CFRP Strengthened Steel-Concrete Composite Beam

Experimental and Numerical Analysis of a CFRP Strengthened Steel-Concrete Composite Beam

Structural performance of composite double beam system

Behavior of Concrete Beams with Corroded Reinforcement Retrofitted with Carbon Fiber Reinforced Polymer

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