Strengthening of RC beams using prestressed fiber reinforced polymers – A review

Aslam, Muhammad Shahzad; Shafigh, Payam; Jumaat, Mohd Zamin; Shah, Syed Nasir

doi:10.1016/j.conbuildmat.2015.02.051

Cited by 128 publications

(42 citation statements)

References 47 publications

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“…Moreover, carbon fiber materials are useful in applications that require chemical attack resistance and damping resistance. According to Aslam et al [11], the main advantages of prestressing with CFRPs are its low weight, extremely high tensile strength, corrosion resistance, very good rheological behavior, electromagnetic neutrality and also quick and easy construction, as well as low labor costs. It should also be mentioned that carbon fibers has an ability to modify the elastic modulus.…”

Section: Structural Strengthening By Prestressing With Frp Laminatesmentioning

confidence: 99%

Opportunities and Risks Arising from the Properties of FRP Materials Used for Structural Strengthening

Derkowski

2015

Procedia Engineering

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Modern composite materials, made on the basis of non-metallic continuous fibers are increasingly used in civil engineering, in particular to strengthen building structures. In strengthening of RC structures the utilization of externally bonded FRP composites is only up to 35% because of the pilling-off failure mechanism. This problem can be solved by the use of pretensioned composite laminates. Due to more complex behavior, the strengthening of structures using prestressing technology needs a careful design approach and a full understanding of the behavior of both the materials and elements. The advantages and risks of the presented technology, which may determinate the success of the entire project, are highlighted in the article.

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Section: Structural Strengthening By Prestressing With Frp Laminatesmentioning

confidence: 99%

Opportunities and Risks Arising from the Properties of FRP Materials Used for Structural Strengthening

Derkowski

2015

Procedia Engineering

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“…A major reason of its implementation lies in the unique characteristics of these materials and their constituents, as well as the appropriate use of FRP composites for its considered design purpose. Numerous investigations have shown that FRP composites are effective materials for use in concrete members [1,2].…”

Section: Introductionmentioning

confidence: 99%

Post-Fire Characteristics of Concrete Beams Reinforced with Hybrid FRP Bars

Protchenko

Szmigiera

2020

Materials

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One of the main concerns of experimental and numerical investigations regarding the behavior of fiber-reinforced polymer reinforced concrete (FRP-RC) members is their fire resistance to elevated temperatures and structural performance at and after fire exposure. However, the data currently available on the behavior of fiber-reinforced polymer (FRP) reinforced members related to elevated temperatures are scarce, specifically relating to the strength capacity of beams after being subjected to elevated temperatures. This paper investigates the residual strength capacity of beams strengthened internally with various (FRP) reinforcement types after being subjected to high temperatures, reflecting the conditions of a fire. The testing was made for concrete beams reinforced with three different types of FRP bars: (i) basalt-FRP (BFRP), (ii) hybrid FRP with carbon and basalt fibers (HFRP) and (iii) nano-hybrid FRP (nHFRP), with modification of the epoxy matrix of the rebar. Tested beams were first loaded at 50% of their ultimate strength capacity, then unloaded before being heated in a furnace and allowed to cool, and finally reloaded flexurally until failure. The results show an atypical behavior observed for HFRP bars and nHFRP bars reinforced beams, where after a certain temperature threshold the deflection began to decrease. The authors suggest that this phenomenon is connected with the thermal expansion coefficient of the carbon fibers present in HFRP and nHFRP bars and therefore creep can appear in those fibers, which causes an effect of “prestressing” of the beams.

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“…For the strengthening of steel structures, carbon fibre reinforced polymers (CFRP) are preferred because of their superior mechanical properties [2,3]. Furthermore, CFRP laminates can be pre-stressed, which enables more effective use of the composite material, contribution of the strengthening in carrying out the dead load, closure of cracks in concrete [4,5], and increased fatigue life in steel [6]. The existing structure and FRP laminate behave as a composite structure with a key role played by the adhesive layer, which transfers the stresses between the bonded elements.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the increased load bearing capacity of steel beams strengthened with pre-stressed FRP laminates

Bennati¹,

Colonna²,

Valvo³

2016

Frattura Ed Integrità Strutturale

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We analyse the problem of a simply supported steel beam subjected to uniformly distributed load, strengthened with a pre-stressed fibre-reinforced polymer (FRP) laminate. We assume that the laminate is first put into tension, then bonded to the beam bottom surface, and finally fixed at both its ends by suitable connections. The beam and laminate are modelled according to classical beam theory. The adhesive is modelled as a cohesive interface with a piecewise linear constitutive law defined over three intervals (elastic response, softening response, debonding). The model is described by a set of differential equations with suitable boundary conditions. An analytical solution to the problem is determined, including explicit expressions for the internal forces and interfacial stresses. As an application, we consider the standard IPE series for the steel beam and the Sika® CarboDur® system for the adhesive and laminate. For each considered cross section, we first carry out a preliminary design of the unstrengthened steel beam. Then, we imagine to apply the FRP strengthening and calculate the loads corresponding to the elastic limit states in the steel beam, adhesive, and laminate. Lastly, we take into account the ultimate limit state corresponding to the plasticisation of the mid-span steel cross section and evaluate the increased load bearing capacity of the strengthened beam

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Strengthening of RC beams using prestressed fiber reinforced polymers – A review

Cited by 128 publications

References 47 publications

Opportunities and Risks Arising from the Properties of FRP Materials Used for Structural Strengthening

Opportunities and Risks Arising from the Properties of FRP Materials Used for Structural Strengthening

Post-Fire Characteristics of Concrete Beams Reinforced with Hybrid FRP Bars

Evaluation of the increased load bearing capacity of steel beams strengthened with pre-stressed FRP laminates

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