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- Title
Nonlinear bond-slip model for fiber-reinforced polymer laminates externally bonded to thermally damaged concrete.
- Authors
Lv, Heng-Da; Xie, Wen-Jian; Gao, Wan-Yang
- Abstract
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 ( G f ) and interfacial brittleness index (B). To study the variations of G f and B 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 G f values were calculated from the peak pull loads with proper consideration of the bond length and width effects, while the B 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 G f 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 B 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.
- Publication
Advances in Structural Engineering, 2024, Vol 27, Issue 4, p585
- ISSN
1369-4332
- Publication type
Article
- DOI
10.1177/13694332241226779