Increasing the flexural performance of RC beams strengthened with CFRP materials

Anania, Laura; Badalà, Antonio; Failla, Giusy

doi:10.1016/j.conbuildmat.2004.04.011

Cited by 31 publications

(14 citation statements)

References 1 publication

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“…If the flexural or shear strength of RC members is not sufficient to maintain their service functions, strengthening of these members become necessary (Anania, Badal, & Failla, 2005;Badawi & Soudki, 2009). However, many deficiencies may arise from a change in the desired capacity, or from errors in construction, such as bars that are pushed down too far in the cross section during construction (Bousias, Triantafillou, Fardis, Spathis, & O'Regan, 2004).…”

Section: Introductionmentioning

confidence: 98%

Flexure strengthening of lightweight reinforced concrete beams using carbon fibre-reinforced polymers

Shannag

Al-Akhras

Mahdawi

2013

Structure and Infrastructure Engineering

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A series of 40 lightweight reinforced concrete (LWRC) beams of 1400 mm length and a rectangular cross section of 150 £ 200 mm were cast, strengthened and then tested under four-point bending test to study the effectiveness of using externally applied carbon fibre-reinforced polymer (CFRP) composites as a method of increasing the flexural strength of under-reinforced LWRC beams. Parameters investigated include reinforcement ratio, r; r ¼ 0.55r b and r ¼ 0.27r b , CFRP sheet length; 600, 800 and 1000 mm, CFRP sheet width; beam width and half-beam width. Three types of strengthening schemes were used: jacketing covers the beam from bottom and two sides with total width of 500 mm, sheets at the tension side with width equal to beam width and sheets with width equal to half-beam width. Test results showed a limited increase in ultimate load-carrying capacity accompanied with some reduction in mid-span deflection for the strengthened beams. Among the strengthening schemes investigated, jacketing was the most effective for strength enhancement (about 41%) with respect to control beam; however, it reduced ductility significantly. An analytical model was proposed for predicting the ultimate load-carrying capacity of LWRC beams strengthened with CFRP composites.Keywords: carbon fibre-reinforced polymers; lightweight concrete beams; flexure strength; strengthening Abbreviations: r, steel reinforcing ratio; CFRPs, carbon fibre-reinforced polymers; LWRC, lightweight reinforced concrete; F, diameter of reinforcing steel; r b , balanced steel ratio; 1 c , concrete strain; 1 cu , maximum usable compressive strain in concrete; h, overall thickness of a member in mm; c, distance from extreme compression fibre to the neutral axis in mm; 1 fu , design rupture strain of FRP; 1 0 s , strain level in compression steel; d 0 , depth of compression steel in mm; E s , modulus of elasticity of steel reinforcement in MPa; A s , area of tension steel in mm 2 ; A 0 s , area of compression steel in mm 2 ; A f , area of FRP reinforcement in mm 2 ; f 0 c , compressive strength of concrete in MPa; b, width of concrete cross section in mm; b 1 , 0.8 for concrete compressive strength of 35 MPa; c, additional reduction factor of the flexural strength contribution of FRP; X, distance between supports and loading point in m

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Section: Introductionmentioning

confidence: 98%

Flexure strengthening of lightweight reinforced concrete beams using carbon fibre-reinforced polymers

Shannag

Al-Akhras

Mahdawi

2013

Structure and Infrastructure Engineering

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“…In these cases, the most common rehabilitation techniques have been accomplished by the use of conventional materials such as steel structural profiles (see Figure 2). However, recently the use of innovative materials like fiber-reinforced polymer (FRP) has emerged as an alternative to the use of the conventional techniques and it seems to be the most promising method to be used in structural engineering [5].…”

Section: Introductionmentioning

confidence: 99%

Flexural Strengthening of Damaged T-Joists with Severe Corrosion Using CFRP Sheets

Vercher

Gil

Más

et al. 2017

Advances in Materials Science and Engineering

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This paper evaluates the residual safety of isolated T-joists with severe corrosion for the two extreme cases of boundary conditions, simply supported and fixed-ended, in order to help in making decisions about the magnitude of the necessary intervention. When the T-joist is part of a complete slab, the boundary conditions will be in an intermediate situation between these two extreme cases, so that it is possible to assess the safety with respect to its degree of embedding. The research is conducted for the cases of healthy T-joist, T-joist with complete corrosion of the lower reinforcement, and repaired T-joists with a variable number of CFRP sheets. This work is based on the ACI 318 load test to maintain a structure in use and proposes a Load Factor (LF), which estimates the safety reserve. The simply supported T-joists specimens with severe corrosion do not meet the Load Factor or ACI 318 criteria, even with a large number of CFRP sheets. On the other hand, fixed-ended cases can be kept in use despite corrosion by applying light CFRP strengthening, and with four sheets the initial safety is restored.

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“…Several methods have been proposed and implemented in the literature for this purpose. Addition of a new reinforced concrete (RC) layer (Aykac, 2001) or gluing FRP laminates (Moon et al, 2007;Yang et al, 2009;Mukherjee and Rai, 2009;Li et al, 2006Li et al, , 2008Bank and Arora, 2007;Toutanji et al, 2006;Anania et al, 2005;Ashour et al, 2004;Ali et al, 2001) to the soffit of the beam are among the investigated beam strengthening methods. Strengthening the beam with an additional RC layer proved to be efficient in improving the flexural behavior.…”

Section: Introductionmentioning

confidence: 99%

Strengthening of RC Beams with Solid Steel Plates

Özbek¹,

Bocek²,

Aycak³

2016

AJTE

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Strengthening of RC beams by bonding steel plates to the bottom face of the beams against flexure is a commonly used method. However, significant ductility problems have been encountered in the studies carried out so far. In this study a simple and applicable end connection has been developed to achieve a satisfied ductility level in addition to the strength. A total of four full scale RC beams, one of them a reference beam, were prepared and tested. Three beams were strengthened against flexure. Despite the increase in the strength about two-andhalf-times, it was found that the behaviour of specimens was still quite ductile.

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Increasing the flexural performance of RC beams strengthened with CFRP materials

Cited by 31 publications

References 1 publication

Flexure strengthening of lightweight reinforced concrete beams using carbon fibre-reinforced polymers

Flexure strengthening of lightweight reinforced concrete beams using carbon fibre-reinforced polymers

Flexural Strengthening of Damaged T-Joists with Severe Corrosion Using CFRP Sheets

Strengthening of RC Beams with Solid Steel Plates

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