Fatigue and Flexural Behavior of Reinforced-Concrete Beams                    Strengthened with Fiber-Reinforced Cementitious Matrix

Aljazaeri, Zena R.; Myers, John J.

doi:10.1061/(asce)cc.1943-5614.0000726

Cited by 32 publications

(17 citation statements)

References 6 publications

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“…Debonding at the concrete-matrix interface[Figs. 6(b and c)]; this has been reported by D'Ambrisi and Focacci (2011),Ombres (2011Ombres ( , 2012,Elsanadedy et al (2013),Babaeidarabad et al (2014),Aljazaeri and Myers (2017a), andPino et al (2017a). The loss of the bond between the concrete and the matrix is the reason for this mode of failure.…”

supporting

confidence: 52%

“…The effectiveness of the flexural strengthening of RC beams and slabs with TRM has been experimentally investigated in the last decade in numerous publications (Bruckner et al 2006;Papanicolaou and Triantafillou 2006;Triantafillou 2007;Jesse et al 2008;Bösche et al 2008;Papanicolaou et al 2009;D'Ambrisi and Focacci 2011;Ombres 2011Ombres , 2012Elsanadedy et al 2013;Babaeidarabad et al 2014;Loreto et al 2013;Verbruggen et al 2016;Aljazaeri and Myers 2017a;Ebead et al 2017;Escrig et al 2017;Koutas and Bournas 2017;Pino et al 2017a, b;Raoof et al 2017;Raoof and Bournas 2017d). Targeting them to assess their flexural capacity, beam or slab elements have been subjected to monotonic three-or four-point bending.…”

Section: General Behaviormentioning

confidence: 99%

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Strengthening of Concrete Structures with Textile Reinforced Mortars: State-of-the-Art Review

et al. 2019

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Textile reinforced mortars (TRM), also known in the international literature as textile reinforced concrete (TRC) or fabric reinforced cementitious matrix (FRCM) materials, have been widely studied during the last two decades as they constitute a promising alternative to the fiber reinforced polymer (FRP) retrofitting solution for strengthening of reinforced concrete members. This paper presents a state-of-the-art review on the strengthening of concrete structures with TRM. First, the tensile and bond behavior of TRM is described. Next, an overview of studies on the use of TRM for flexural, shear, confinement, and seismic retrofitting of concrete or RC members is included, and the key parameters are investigated.

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supporting

confidence: 52%

Section: General Behaviormentioning

confidence: 99%

Strengthening of Concrete Structures with Textile Reinforced Mortars: State-of-the-Art Review

et al. 2019

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“…To the best of the authors' knowledge, five studies that analyzed the effect of various parameters on the fatigue life of FRCM-strengthened RC beams with different geometries subjected to a bending test set-up (see Figure 1) are currently available in the literature [1,35,[38][39][40]. The geometrical characteristics of the specimens presented in those five studies are reported in Table 1 with reference to the parameters depicted in Figure 1.…”

Section: Database Of Existing Resultsmentioning

confidence: 99%

“…The geometrical characteristics of the specimens presented in those five studies are reported in Table 1 with reference to the parameters depicted in Figure 1. [35] 2200 800 2400 120 230 205 101 308 2000 120 [39] 2032 254 2133 203 305 268 157 236 1880 203 [40] 2560 800 2800 2345 250 225 101 402 2400 150 [1] 1524 0 1829 2972 305 268 142 213 1524 152 [38] 1524 0 1829 2345 305 268 142 213 1524 152…”

Section: Database Of Existing Resultsmentioning

confidence: 99%

Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate

et al. 2020

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Several reinforced-concrete (RC) structural elements are subjected to cyclic load, such those employed in highway and railroad bridges and viaducts. The durability of these elements may be reduced as a consequence of fatigue, which mainly affects the steel reinforcement. The use of externally bonded (EB) fiber-reinforced cementitious matrix (FRCM) composites allows the moment capacity to be shared by the internal reinforcement and the EB composite, thus increasing the fatigue life of the strengthened RC member. The effectiveness of EB FRCM composites is related to the composite bond properties. However, limited research is currently available on the effect of fatigue on the bond behavior of FRCM-substrate joints. This study provides first the state of the art on the fatigue behavior of different FRCM composites bonded to a concrete substrate. Then, the fatigue bond behavior of a polyparaphenylene benzo-bisoxazole (PBO) FRCM is experimentally investigated using a modified beam test set-up. The use of this set-up provided information on the effect of fiber-matrix interface shear and normal stresses on the specimen fatigue bond behavior. The results showed that fatigue loading may induce premature debonding at the matrix-fiber interface and that stresses normal to the interface reduce the specimen fatigue life.

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“…For instance, Ebead et al (2017) reported substantial improvement of 77% in the flexural strength of RCB strengthened with carbon FRCM in three layers. Similarly, Aljazaeri and Myers (2017) reported a successful increase of 60% in the load-carrying capacity of FRCM reinforced concrete members. Another experimental study (Chen and Cheng, 2017) analytically demonstrated that FRP bonded sheets successfully enhanced the flexural strength of the RCB.…”

Section: Introductionmentioning

confidence: 89%

Strengthening and Characterization of Existing Reinforced Concrete Beams for Flexure by Effective Utilization of External Steel Elements

Gul

Alam

Ahmed

et al. 2020

Advances in Structural Engineering

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Strengthening of structural members is a common practice around the world that may arise due to deterioration of concrete with age or upgradation of design code. This paper aims to elucidate a technique used for strengthening of the reinforced concrete beam for flexural capacity by using externally welded steel angles and steel bars. For this motive, three beams were strengthened with external steel angles and three with external steel bars. The external strengthening steel elements were attached at the bottom of the beam with shear reinforcement. Control samples without external steel angles and steel bars for comparison purposes were also prepared. All reinforced concrete beams were first constructed using a concrete ratio of 1:2:4, and then external steel elements were added to existing flexural reinforcement by using a fillet weld with tee joints having thickness and length of 5/16" (7.9 mm) and 6" (152.4 mm), respectively. Fourth point loading criteria were used to investigate the flexural capacity of beams in positive bending. All beams were designed strong enough in shear, to resist the ultimate loads without shear failure. Test results indicated that beams strengthened with this technique have an average increase of 238% with steel angles and 106% with steel bars, in load-carrying capacity than control samples. Strengthened beams showed a uniform crack pattern. Moreover, the concrete cover made a good bond with existing concrete and was strong enough to withstand ultimate loads. Conclusively, the steel angles and steel bars can be used as an external strengthening material, to enhance the flexural capacity of reinforced concrete beams.

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Fatigue and Flexural Behavior of Reinforced-Concrete Beams Strengthened with Fiber-Reinforced Cementitious Matrix

Cited by 32 publications

References 6 publications

Strengthening of Concrete Structures with Textile Reinforced Mortars: State-of-the-Art Review

Strengthening of Concrete Structures with Textile Reinforced Mortars: State-of-the-Art Review

Fatigue Behavior of PBO FRCM Composite Applied to Concrete Substrate

Strengthening and Characterization of Existing Reinforced Concrete Beams for Flexure by Effective Utilization of External Steel Elements

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