Tension Stiffening and Cracking Behavior of Glass Fiber-Reinforced Polymer-Reinforced Concrete

Kharal, Zahra; Sheikh, Shamim A.

doi:10.14359/51689420

Cited by 10 publications

(7 citation statements)

References 3 publications

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“…The tension stiffening model adopted in fib model code 2010 [27], which was originally developed for steel RC, was shown to yield reliable results for the short-term tension stiffening behaviour of GFRP RC members [28].…”

Section: Analytical Model For Tension Stiffeningmentioning

confidence: 99%

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Long-term performance of GFRP bars in concrete elements under sustained load and environmental actions

Fergani

Benedetti

Oller

et al. 2018

Composite Structures

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This paper presents an experimental study aimed at investigating the long-term tension stiffening and flexural behaviour of concrete elements reinforced with glass fibre reinforced polymer (GFRP) bars subjected to accelerated aging conditions. Six tension stiffening specimens and eight small-scale GFRP RC beams were exposed to different environments and sustained stress levels for 120 and 270 days, respectively. Subsequently, the specimens were tested to failure and their behaviour was compared to that of reference specimens. The test results revealed that stressed specimens conditioned in a wet environment experienced a reduction in tension stiffening response as a result of bond degradation and a reduced stress transfer from the bar to the surrounding concrete. The results also indicate that the accelerated aging conditions affected the overall flexural behaviour and led to higher deflections and larger crack widths. The long-term deformation of elements subjected to a stress level representing typical in-service conditions, however, always complied with the design limits suggested by current guidelines. Higher imposed loads (inducing maximum strain level in the reinforcement of about 5000) led to both deflections and crack widths in excess of the values recommended at serviceability limit state. Finally, the response of the tested specimens is compared to that predicted according to fib Model Code 2010 and Eurocode 2 and it is shown that both models fail to capture adequately the long-term structural behaviour of stressed GFRP RC specimens conditioned in wet environment.

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Section: Analytical Model For Tension Stiffeningmentioning

confidence: 99%

“…These different approaches have been implemented in current design guidelines for FRP RC (e.g. [24][25][26][27]) but have been shown to overestimate tension stiffening and underestimate deflections [28,29]. In addition, there is very limited research examining long-term tension stiffening response [e.g.…”

Section: Introductionmentioning

confidence: 99%

Long-term performance of GFRP bars in concrete elements under sustained load and environmental actions

Fergani

Benedetti

Oller

et al. 2018

Composite Structures

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“…Tension stiffening is commonly analyzed using the normalized tensile stress in concrete that was obtained using the average strain-stress approach suggested in the literature [36,49,51,[53][54][55]. This approach is characterized by realistic estimation, where the tension stiffening is obtained by subtracting the bare bar response from the total member response.…”

Section: Tension-stiffening Factor (β)mentioning

confidence: 99%

“…The amount of tensile stresses carried by concrete depends to a large extent on the interaction (bond) between the reinforcement. This factor is often used to describe the tensile behavior of concrete and consider the concrete stress variation in a cracked prism with respect to the cracking stress [53]. It is well known that this factor is a material property for cracked concrete that is independent of the concrete strength and steel bar ratio [27,56].…”

Section: Tension-stiffening Factor (β)mentioning

confidence: 99%

Tension Stiffening and Cracking Behavior of Axially Loaded Alkali-Activated Concrete

Abdulrahman,

Muhamad,

Shukri

et al. 2023

Materials

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Alkali-activated concrete is an eco-friendly construction material that is used to preserve natural resources and promote sustainability in the construction industry. This emerging concrete consists of fine and coarse aggregates and fly ash that constitute the binder when mixed with alkaline activators, such as sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). However, understanding its tension stiffening and crack spacing and width is of critical importance in fulfilling serviceability requirements. Therefore, this research aims to evaluate the tension stiffening and cracking performance of alkali-activated (AA) concrete. The variables considered in this study were compressive strength (fc) and concrete cover-to-bar diameter (Cc/db) ratios. After casting the specimen, they were cured before testing at ambient curing conditions for 180 days to reduce the effects of concrete shrinkage and obtain more realistic cracking results. The results showed that both AA and OPC concrete prisms develop slightly similar axial cracking force and corresponding cracking strain, but OPC concrete prisms exhibited a brittle behavior, resulting in a sudden drop in the load–strain curves at the crack location. In contrast, AA concrete prisms developed more than one crack simultaneously, suggesting a more uniform tensile strength compared to OPC specimens. The tension-stiffening factor (β) of AA concrete exhibited better ductile behavior than OPC concrete due to the strain compatibility between concrete and steel even after crack ignition. It was also observed that increasing the confinement (Cc/db ratio) around the steel bar delays internal crack formation and enhances tension stiffening in AAC. Comparing the experimental crack spacing and width with the values predicted using OPC codes of practice, such as EC2 and ACI 224R, revealed that EC2 tends to underestimate the maximum crack width, while ACI 224R provided better predictions. Thus, models to predict crack spacing and width have been proposed accordingly.

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“…Estudos comparando os efeitos de enrijecimento à tração de elementos reforçados com estes dois tipos de barras reportaram uma contribuição muito mais expressiva do concreto quando barras de GFRP foram utilizadas [50,54]. As influências da resistência do concreto e da taxa de armadura no comportamento de prismas de concreto reforçado por GFRP foram avaliadas no estudo de Sooriyaarachchi et al [55].…”

Section: Fibras De Polipropileno Como Reforço Disccreto De Matrizes Cimenticiasunclassified

Influência Da Adição De Fibras De Polipropileno No Comportamento De Elementos Estruturais De Concreto Armado Com Barras De GFRP

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Glass-fiber reinforced polymer (GFRP) bars have been more often used in reinforced concrete (RC) structures mainly due to superior corrosion resistance and mechanical strength. However, the low modulus of elasticity leads to serviceability issues such as wider crack openings and larger deflections when compared to conventional RC. To improve the performance and allow for a more effective use of GFRP reinforcement, the addition of randomly disperse short polypropylene fibers (PP) to the concrete matrix is proposed. In the present study, an experimental program intending to investigate the flexural and tensile behavior of concrete members reinforced with GFRP bars and 10 kg/m 3 of PP is carried out. Mechanical characterization and pull-out tests were carried out respectively to characterize the materials and interface between GFRP bar and concrete. Crack formation and growth, and tension stiffening effect in the proposed construction material were investigated by tension tests in reinforced concrete prisms. Four points bending tests were performed to evaluate the mid-span deflection, crack opening and moment-curvature relationship of the specimen. Digital image correlation was used to gather information about relevant data. It was proposed an analytical model to compare the results obtained in bending tests. A considerable reduction in crack openings, a better multiple cracks behavior and a slightly stiffer behavior was obtained due to fiber addition.

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Tension Stiffening and Cracking Behavior of Glass Fiber-Reinforced Polymer-Reinforced Concrete

Cited by 10 publications

References 3 publications

Long-term performance of GFRP bars in concrete elements under sustained load and environmental actions

Long-term performance of GFRP bars in concrete elements under sustained load and environmental actions

Tension Stiffening and Cracking Behavior of Axially Loaded Alkali-Activated Concrete

Influência Da Adição De Fibras De Polipropileno No Comportamento De Elementos Estruturais De Concreto Armado Com Barras De GFRP

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