Shear Strengthening of Reinforced Concrete Beams Using Carbon-Fiber-Reinforced Polymer Laminates

Zhang, Zhichao; Hsu, Cheng‐Tzu Thomas

doi:10.1061/(asce)1090-0268(2005)9:2(158)

Cited by 153 publications

(77 citation statements)

References 1 publication

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“…Khalifa et al's (1998) Equation 4a gives an upper bound to R, which is frequently overridden by Equation 4b, which is based on bond failure. Equation 11 of Zhang and Hsu (2005) also gives an upper bound to R. Figure 4 shows that the relationship between the effective strain in the FRP and its axial rigidity is also evident in data from tests carried out by Khalifa and Nanni (2002) and the current authors in which the sheet thickness and the width of the beam were not varied. The authors consider there to be a genuine relationship between the axial rigidity of CFRP and å fe which should be accounted for in design.…”

Section: Assessment and Development Of Existing Design Recommendationsmentioning

confidence: 74%

“…The database consisted of 30 beams reinforced in shear with only CFRP (six beams from this study, five beams from Adhikary and Mutsuyoshi (2004) (B-4 to B-8 inclusive), eight beams from Nanni (2002, 2000) (BT2 to BT5 inclusive and SO3-2 to SO3-4 and SO4-2), nine beams from Triantafillou (1998) (S1a, S1b, S2a, S2b, S3a, S36b, S1-45 to S3-45) and two beams from Zhang and Hsu (2005) (Z4 45, Z4 90)) and 20 beams with CFRP and steel shear reinforcement (four beams from Chaallal et al (1998), all 11 beams from Pelligrino and Modena (2002) and five beams from Monti and Liotta (2007) (UF90, UF45+A, UF45+D, WS45+, UF90)). The beams of Monti and Liotta (2007) and Pelligrino and Modena (2002) are not included in Table 1.…”

Section: Application Of Eurocodementioning

confidence: 92%

“…2. Zhang and Hsu (2005) presented two equations for calculating R, the least of which is used in Equation 3. They concluded that the fracture of FRP laminates was far more complicated than expected and that there was no simple relationship between R and axial rigidity for FRP fracture.…”

Section: Calculation Of Effective Stress In Frpmentioning

confidence: 99%

“…Figure 4 compares the reduction factors R (with å fu ¼ 0 . 015) given by Equation 12 with the corresponding values given by Khalifa et al (1998) ( Equation 4a), Triantafillou and Antonopoulos (2000) ( Equation 7) and Zhang and Hsu (2005) (Equation 11). The method of Triantafillou and Antonopoulos (2000) has the disadvantage of not differentiating between side Shear strengthening of reinforced concrete beams with CFRP Magazine of Concrete Research, 2010, 62, No.…”

Section: Assessment and Development Of Existing Design Recommendationsmentioning

confidence: 99%

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Shear strengthening of reinforced concrete beams with CFRP

Bukhari

Vollum

Ahmad

et al. 2010

Magazine of Concrete Research

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The current paper reviews existing design guidelines for strengthening beams in shear with carbon fibre reinforced polymer (CFRP) sheets and proposes a modification to Concrete Society Technical Report TR55. It goes on to present the results of an experimental programme which evaluated the contribution of CFRP sheets towards the shear strength of continuous reinforced concrete (RC) beams. A total of seven, two-span concrete continuous beams with rectangular cross-sections were tested. The control beam was not strengthened, and the remaining six were strengthened with different arrangements of CFRP sheets. The experimental results show that the shear strength of the beams was significantly increased by the CFRP sheet and that it is beneficial to orientate the FRP at 458 to the axis of the beam. The shear strength of FRP strengthened beams is usually calculated by adding individual components of shear resistance from the concrete, steel stirrups and FRP. The superposition method of design is replaced in Eurocode 2 by the variable angle truss model in which all the shear is assumed to be resisted by the truss mechanism. The current paper proposes a methodology for strengthening beams with FRP that is consistent with Eurocode 2.

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Section: Assessment and Development Of Existing Design Recommendationsmentioning

confidence: 74%

Section: Application Of Eurocodementioning

confidence: 92%

Section: Calculation Of Effective Stress In Frpmentioning

confidence: 99%

Section: Assessment and Development Of Existing Design Recommendationsmentioning

confidence: 99%

See 2 more Smart Citations

Shear strengthening of reinforced concrete beams with CFRP

Bukhari

Vollum

Ahmad

et al. 2010

Magazine of Concrete Research

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show abstract

“…Test results show that sustaining load levels at the time of strengthening have important influence on the ultimate strength of strengthened reinforced concrete beams. Zhang and Hsu (2005) [19], investigated eleven RC beams without steel shear reinforcement. After the beams were kept in the curing room for 28 days, carbon-fiber strips and fabrics made by Sika Corp were applied on both sides of the beams at various orientations with respect to the axis of the beam.…”

Section: Related Studiesmentioning

confidence: 99%

Structural Behavior of Strengthened RC Beams in Shear using CFRP Strips

Ibrahim¹,

Mansor²,

Hameed³

2017

TOCIEJ

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Carbon fiber reinforced polymers (CFRP) were widely used in strengthening of reinforced concrete members in the last few years. Experimental and theoretical investigations were carried out to find the behavior of reinforced concrete beams strengthened in shear by CFRP strips. Six beams measured of 200x300x2000mm were investigated. The variables investigated in this work are orientation (vertical and inclined) and the spacing between CFRP strips.It was found that the strengthening by CFRP strips increased the crack, yield and ultimate load by 10%, 71% and 77% respectively on average. Inclined CFRP strips show a better performance than vertical CFRP strips with same distances and increase the yield and ultimate load by 11% and 13% respectively on average. By covering all faces of specimen with CFRP strips, the yield and ultimate load increased by 82% and 95% respectively. Using the CFRP strips changed the failure model from shear to flexural by increasing the shear strength, so the ductility was increased by 198% on average. CFRP increased the strain in compression face of concrete and the value was greater than (0.003). For all strengthened specimens, there was no effect on CFRP strips.

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The effects of CFRP orientation on the strengthening of reinforced concrete structures

Lima

Doh

Hadi

et al. 2016

Struct. Design Tall Spec. Build.

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In recent years, the strengthening and retrofitting of structural members using externally bonded carbon fibre reinforced polymer (CFRP) materials has gained a great deal of attention. This has eventuated from the superior properties of composite materials, including high elastic modulus, higher strengths and lighter weights. This paper presents a finite element analysis that has been validated against laboratory tests of two reinforced concrete (RC) beams, two columns, two slabs and six walls. The main focus is on the ultimate failure load of these members as they have different CFRP orientations to the loading direction. The analysis result shows a sound agreement with the experimental data regarding the ultimate failure load of RC samples, except for the RC wall. In fact, the RC wall, while under eccentric axial load, confirmed that the CFRP orientation was parallel to the loading direction, and it proved to be an insignificant contribution in the ultimate failure load of the samples. This finding demonstrates that more experiments should be considered when investigating the influence of CFRP on the ultimate strength of strengthened RC walls.

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Shear Strengthening of Reinforced Concrete Beams Using Carbon-Fiber-Reinforced Polymer Laminates

Cited by 153 publications

References 1 publication

Shear strengthening of reinforced concrete beams with CFRP

Shear strengthening of reinforced concrete beams with CFRP

Structural Behavior of Strengthened RC Beams in Shear using CFRP Strips

The effects of CFRP orientation on the strengthening of reinforced concrete structures

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