Studying the Flexural Behavior of Reinforced Concrete Beams under the Effect of High Temperature: A Finite Element Model

• Autorzy: Al-Baijat Hamadallah , Alhawamdeh Mohammad , Khawaldeh Aya

Identyfikatory

DOI

10.12913/22998624/109055

• Języki publikacji: EN

Abstrakty

EN

The strength of concrete elements can be greatly affected by elevated temperature as in fires, and so a great concern must be taken regarding its behavior under such condition. In this paper, a finite element model was built up using ABAQUS software to investigate the flexural behavior of reinforced concrete (RC) beams subjected to service load under elevated temperature. The beam was simply supported and was loaded at one-third and two-third of span length. The study consisted of three RC beams models; the first model simulated a control beam specimen at ambient temperature 20 °C, while the other two models demonstrated damaged beams specimens according to two high temperatures 400 °C and 800 °C, respectively. Each RC beam had 2 m span length, 300 mm height and 200 mm width. The steel reinforcement configuration was 3ϕ16 mm (Grade 60) main bars at the positive moment region in the beam bottom, 2ϕ14 mm (Grade 60) secondary bars at the beam top, and ϕ10 mm /150 mm closed stirrups. The model was validated by comparing its results with the theoretical results from ACI code and literature. Several mechanical properties were investigated including concrete compressive strength, modulus of elasticity, and reinforcing steel yielding strength. The test results showed a reduction in the flexural capacity of the RC beams, tested at 400 °C and 800 °C, of 17.6% and 88.2%, respectively, with respect to the control beam. The maximum service load carried by the beam, at one-third and two-third of the span length, decreased by 17.1% and 88.1% for the 400 ℃ and 800 ℃ high temperature, respectively. The results also showed an increase in deflection when the temperature increased due to the loss in stiffness.

Słowa kluczowe

EN

flexural behaviour; reinforced concrete beam; high temperature; fire; finite element model; deflection

PL

zachowanie przy zginaniu; belka żelbetowa; temperatura wysoka; pożar; model elementu skończonego; ugięcie

• Wydawca: Lublin University of Technology ; Polish Society of Ecological Engineering (PTIE), Branch of PTIE in Lublin
• Czasopismo: Advances in Science and Technology. Research Journal
• Rocznik: 2019
• Tom: Vol. 13, no 2
• Strony: 150--156
• Opis fizyczny: Bibliogr. 10 poz., fig., tab.

Twórcy

autor

Al-Baijat Hamadallah

• Department of Civil Engineering, Faculty of Engineering, Tafila Technical University, P. O. Box (179) Tafila 66110, Jordan
• [e-mail]

autor

Alhawamdeh Mohammad

• Department of Civil Engineering, Faculty of Engineering, Tafila Technical University, P. O. Box (179) Tafila 66110, Jordan

autor

Khawaldeh Aya

• Department of Civil Engineering, Faculty of Engineering, Jordan University of Science and Technology, P. O. Box (3030) Irbid 22110, Jordan

Bibliografia

• 1. ACI Committee 318. 2014. Building Code Requirements for Structural Concrete (ACI 318M- 14) and Commentary (ACI 318RM-14). American Concrete Institute, Farmington Hills, MI.
• 2. Chen J., Young B., and Uy B. 2006. Behavior of high strength structural steel at elevated temperatures. Journal of Structural Engineering, 132(12), 1948-1954.
• 3. Ellingwood B., and Lin T.D. 1991. Flexure and shear behavior of concrete beams during fires. Journal of Structural Engineering, 117(2), 440-458.
• 4. Huang Z., Burgess I.W., and Plank R.J. 1999. Nonlinear analysis of reinforced concrete slabs subjec-ted to fire. Structural Journal, 96(1), 127-135.
• 5. Topçu I.B., and Karakurt C. 2008. Properties of reinforced concrete steel rebars exposed to high temperatures. Research Letters in Materials Science, 2008, 1-4. doi:10.1155/2008/814137
• 6. Knaack A.M., Kurama Y.C., and Kirkner D.J. 2011. Compressive stress-strain relationships for North American concrete under elevated temperatures. ACI Materials Journal, 108(3), 270.
• 7. Kodur V.K.R., and Agrawal A. 2016. An approach for evaluating residual capacity of reinforced concrete beams exposed to fire. Engineering Structures, 110, 293-306.
• 8. Kowalski R. 2010. Mechanical properties of concrete subjected to high temperature. Architecture Civil Engineering Environment, (2), 61-70.
• 9. Tsai W.T. 1988. Uniaxial compressional stress-strain relation of concrete. Journal of Structural Engineering, 114(9), 2133-2136.
• 10. Wong M.B. 2011. Plastic analysis and design of steel structures. Butterworth-Heinemann, Oxford.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).