Effective strengthening schemes for heat damaged reinforced concrete beams

Alshannag, Mohammad; Alshenawy, Abdulhafiz O.

doi:10.1016/j.jksues.2019.10.003

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…FRP composites offer several advantages over traditional strengthening materials, including high strength-to-weight ratio, corrosion resistance, ease of application, and minimal changes in structural dimensions (Bisby et al, 2011). The use of FRP laminates has proven effective in the repair and strengthening of thermally or fire-damaged concrete (referred to as “thermally damaged concrete” for brevity) and RC members, including columns (Al-Kamaki et al, 2015; Bisby et al, 2011; Ouyang et al, 2021a, 2021b; Shayanfar et al, 2023; Song et al, 2021; Yaqub and Bailey, 2011) and flexural members such as slabs and beams (Alshannag and Alshenawy, 2020; Haddad et al, 2011; Xu et al, 2019). For example, Haddad et al (2011) conducted an experimental study using carbon FRP (CFRP) and glass FRP (GFRP) laminates to strengthen thermally damaged high-strength RC slabs.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed significant enhancements in load-carrying capacity, reaching up to 158% for CFRP and 125% for GFRP laminates, accompanied by stiffness improvements of up to 319% and 197%, respectively. Similarly, Alshannag and Alshenawy (2020) applied CFRP and GFRP laminates to strengthen thermally damaged RC beams, resulting in load-carrying capacity improvements of 131.2% and 184.3%, respectively. These experimental results have demonstrated the effectiveness of FRP laminates as a practical solution for repairing and strengthening fire-damaged RC members, thereby significantly increasing the load-carrying capacity.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear bond-slip model for fiber-reinforced polymer laminates externally bonded to thermally damaged concrete

Lv,

Xie,

Gao

2024

Advances in Structural Engineering

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This paper presents a novel nonlinear local bond-slip model for fiber-reinforced polymer (FRP) laminates externally bonded to thermally damaged concrete substrates. The proposed model is an extension of an existing two-parameter bond-slip model and incorporates two key parameters including interfacial fracture energy ([Formula: see text]) and interfacial brittleness index ([Formula: see text]). To study the variations of [Formula: see text] and [Formula: see text] with different thermal damage levels of the concrete substrate, an extensive experimental database of shear tests on FRP-to-thermally damaged concrete bonded joints was collected from the existing literature. The [Formula: see text] values were calculated from the peak pull loads with proper consideration of the bond length and width effects, while the [Formula: see text] values were obtained by least-squares regression analysis using experimental load-displacement curves or measured strain distributions in the FRP laminates. The results have indicated that the [Formula: see text] values initially exhibit a slight increase accompanied by mild thermal damage of the concrete substrate after exposure to moderately high temperatures; however, these values significantly decrease when the exposure temperature exceeds 300°C. The [Formula: see text] values initially decrease with high-temperature exposure and stabilize at around 50% of the initial values when the temperatures reach around 400°C. Despite the inherent variability in the test database, the proposed temperature-dependent bond-slip model has demonstrated its accuracy, as demonstrated by the comparisons between the theoretical predictions generated by the model and the corresponding shear test results. This interfacial bond-slip model is expected to serve as a constitutive law to characterize the bond behavior between externally bonded FRP laminates and thermally damaged concrete substrate, thus facilitating the practical application of high-performance FRP composites in the repair and strengthening of thermally or fire-damaged RC members.

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