Mechanical properties and bond strength degradation of GFRP and steel rebars at elevated temperatures

Özkal, Fatih Mehmet; Polat, Mehmet; Yagan, Mahmud; Ozturk, Muhammed Orhan

doi:10.1016/j.conbuildmat.2018.06.203

Makale Tam Makale Uluslararası 2018

Mechanical properties and bond strength degradation of GFRP and steel rebars at elevated temperatures

Fatih Mehmet Özkal, Mehmet Polat, Mahmud Yagan, Muhammed Orhan Ozturk

CONSTRUCTION AND BUILDING MATERIALS Cilt 184 · ss. 45–57 · 30.09.2018

DOI ile aç

Özet

Fiber reinforced polymer (FRP) rebars have recently been gaining popularity in the construction industry all around the world while steel rebars have been widely used so far. FRP bars, which have higher tensile strength compared to steel rebars with the same nominal diameter under normal conditions, are composed of resin matrix and fibers. In this study, mechanical and bonding properties of glass fiber reinforced polymer (GFRP) and steel rebars subjected to elevated temperature effects were investigated throughout a correlative comparison. Axial tensile tests and pull-out tests of these materials were performed subsequent to exposing them into elevated temperature effects in the range of 23-800 degrees C. Severe effects on the tensile properties of bare steel bars were observed after 600 degrees C, while this critical limit is 300 degrees C for bare GFRP bars. Test results show that bond strength degradation is almost linear for both type of rebars, however, 600 degrees C is also the critical temperature regarding the serious deterioration on concrete. Additionally, an empirical modeling approach on the bond strength degradation of rebars at elevated temperatures was proposed and it was found that comparison results have quite promising consistency based on the modeling process. (C) 2018 Elsevier Ltd. All rights reserved.

Anahtar kelimeler

bond strength MODULUS PERFORMANCE BEHAVIOR EXPOSURE CONCRETE FRP elevated temperatures Fire effect Glass fiber reinforced polymers GFRP rebars Tensile tests Pull-out tests REINFORCED POLYMER BARS

Atıf için künye

Özkal, F. M., Polat, M., Yagan, M., & Ozturk, M. O. (2018). Mechanical properties and bond strength degradation of GFRP and steel rebars at elevated temperatures. CONSTRUCTION AND BUILDING MATERIALS, 184, 45–57. https://doi.org/10.1016/j.conbuildmat.2018.06.203

BibTeX

@article{ozkal2018-197431,
  author = {Özkal, Fatih Mehmet and Polat, Mehmet and Yagan, Mahmud and Ozturk, Muhammed Orhan},
  title = {Mechanical properties and bond strength degradation of GFRP and steel rebars at elevated temperatures},
  journal = {CONSTRUCTION AND BUILDING MATERIALS},
  year = {2018},
  volume = {184},
  pages = {45--57},
  issn = {0950-0618},
  doi = {10.1016/j.conbuildmat.2018.06.203},
  url = {https://akademik.atauni.edu.tr/yayinlar/197431-mechanical-properties-and-bond-strength-degradation-of-gfrp-and-steel-rebars-at}
}