Effect of mat anchorage on flexural bonding strength between concrete and sand coated GFRP bars

Shakiba, Milad; Oskouei, Asghar Vatani; Karamloo, Mohammad; Doostmohamadi, Alireza

doi:10.1016/j.compstruct.2021.114339

Cited by 19 publications

(3 citation statements)

References 28 publications

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“…Fibre reinforced polymer (FRP) composites have found extensive use in a variety of civil and construction applications, particularly when employed to strengthen or enhance concrete structures [1][2][3][4]. The high strength and stiffness-to-weight ratio [5][6][7][8][9] and the absence of corrosion, make FRP a compelling alternative to traditional carbon steel in settings such as offshore structures [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Tensile strength retention of glass fibre-reinforced stirrups subjected to aggressive solutions: effect of environmental condition, stirrup shape and stirrup diameter

Hajmoosa,

Mahmoudi,

Ebrahimzadeh

et al. 2024

Mater Struct

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The aim of this study was to examine how the tensile strength of glass fibre reinforced polymer stirrups is affected by different types of solutions, including alkaline, seawater, tap water, and acidic solutions. The study involved the production and testing of 260 stirrups in two different shapes (L and U) with diameters of 6 and 8 mm. The stirrups were immersed in different solutions for a period of 9 months at different temperatures (25, 40, and 60 °C). The findings indicated that the alkaline solution was the most aggressive environment, resulting in a maximum reduction of 92% in tensile strength after 9 months at 60 °C. Seawater and acidic solutions were the second and third most aggressive environments, causing maximum tensile strength reductions of 34 and 22% respectively, after 9 months at 60 °C. On the other hand, tap water was found to be the least aggressive environment, causing a maximum tensile strength reduction of 20% after 9 months at 60 °C. Furthermore, the study observed that the L-shaped stirrups exhibited slightly superior performance compared to the U-shaped stirrups. However, the diameter of the stirrups was found to be a negligible factor.

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Section: Introductionmentioning

confidence: 99%

Tensile strength retention of glass fibre-reinforced stirrups subjected to aggressive solutions: effect of environmental condition, stirrup shape and stirrup diameter

Hajmoosa,

Mahmoudi,

Ebrahimzadeh

et al. 2024

Mater Struct

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“…The mechanical interlocking of FRP bars and concrete is accomplished by a variety of parameters, including chemical bonding, friction, and mechanical interlocking [28][29][30]. To increase the mechanical interlocking and friction between FRP bar and concrete, methods such as using ribbed, helically grooved, and sand-coated bars, as well as different mechanical anchorage systems [31][32][33][34][35][36][37][38] have been used. The common solution for steel-reinforced parts is to employ regular 90 and 180°bends in the bars.…”

Section: Introductionmentioning

confidence: 99%

Bond durability between anchored GFRP bar and seawater concrete under offshore environmental conditions

et al. 2023

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The lower bond strength of FRP bars to concrete compared to steel bars has remained an unsolved barrier to the widespread use of FRP-reinforced concrete under extreme loading. Additionally, the degradation of the bond between FRP reinforcement and concretes in aggressive environments adds to the existing concern. In this study, an innovative anchorage system comprised of polypropylene pipe was used to strengthen the bond between seawater concrete and GFRP bars after 250 days of exposure to offshore environmental conditions. As material factors, two types of GFRP bars (sand-coated and ribbed) and two types of concrete (normal and seawater concrete) were evaluated. Four distinct environmental conditions were used to assess the samples: (i) ambient environment (control), (ii) tap water, (iii) seawater, and (iv) wet-dry cycles in seawater. According to the findings of the direct pull-out tests, the suggested anchor system strengthens the bond and shifts the failure mode from bond failure to bar rupture. Additionally, after exposure to 250 days of seawater wet-dry cycles, GFRP-reinforced seawater concrete lost 5% of its maximum bond strength (developed bar tensile stress). All other samples exposed to different environmental conditions either increased or decreased in bond strength by less than 5% after 250 days, compared to the control samples.

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“…e energy applied to the structure must be transferred to the ground or dissipated through a suitable mechanism. For this reason, it is necessary to apply di erent methods in the improvement of buildings according to the existing conditions [5][6][7]. Preventing structural collapse and saving lives is the most important criterion for the structural design of earthquake-resistant buildings.…”

Section: Introductionmentioning

confidence: 99%

Analytical and Numerical Investigation of Knee Brace Equipped with a Shape Memory Alloy Damper

Shakiba

Mortazavi

2022

Shock and Vibration

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Shape memory alloys (SMAs) are some of the new materials that have attracted the attention of many engineers due to their unique behavior. The most important advantage of these materials is their superelastic behavior, which allows the alloy to return to its original shape after a large deformation. In superelastic behavior, the shape memory alloy can also dissipate a significant amount of energy while returning to its original shape. In this research, the superelastic alloy made of nitinol has been used to improve the performance of knee dampers. For this purpose, a frame equipped with a knee damper was selected as the reference model and was modelled in Abaqus numerical software and validated with an experimental model. After ensuring the correct behavior of the numerical model, the SMA damper was installed perpendicular to the knee damper, between the knee damper and the beam to column connection. In this paper, two parameters of the SMA damper cross section area and SMA length were investigated. Based on the observed results, increasing the length of SMA increases the system resistance. As the cross section area of the SMA damper increases, the effect of the SMA length on the resistance of the system increases. On the other hand, increasing the cross section area of the SMA significantly increases the recentering of the system. Due to the significant recentering that the SMA damper creates in the structure, the amount of energy dissipation of the system is reduced compared to the reference model. The amount of dissipated energy depends on the length and cross section area of the SMA damper. Thus, the longer the SMA, the greater the energy dissipation, and the lower the SMA cross section area, the lower the system energy dissipation.

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Effect of mat anchorage on flexural bonding strength between concrete and sand coated GFRP bars

Cited by 19 publications

References 28 publications

Tensile strength retention of glass fibre-reinforced stirrups subjected to aggressive solutions: effect of environmental condition, stirrup shape and stirrup diameter

Tensile strength retention of glass fibre-reinforced stirrups subjected to aggressive solutions: effect of environmental condition, stirrup shape and stirrup diameter

Bond durability between anchored GFRP bar and seawater concrete under offshore environmental conditions

Analytical and Numerical Investigation of Knee Brace Equipped with a Shape Memory Alloy Damper

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