Bending-strength evaluation of wide-flange steel beams subjected to local buckling at elevated temperatures
Journal of Structural Fire Engineering
Article publication date: 11 July 2022
The main purpose of this study was to propose theoretical calculation models to evaluate the theoretical bending strengths of welded wide-flange section steel beams with local buckling at elevated temperatures.
Steady-state tests using various test parameters, including width-thickness ratios (Class 2–4) and specimen temperatures (ambient temperature, 400, 500, 600, 700, and 800°C), were performed on 18 steel beam specimens using roller supports to examine the maximum bending moment and bending strength after local buckling. A detailed calculation model (DCM) based on the equilibrium of the axial force in the cross-section and a simple calculation model (SCM) for a practical fire-resistant design were proposed. The validity of the calculation models was verified using the bending test results.
The strain concentration at the local buckling cross-section was mitigated in the elevated-temperature region, resulting in a small bending moment degradation after local buckling. The theoretical bending strengths after local buckling, evaluated from the calculation models, were in good agreement with the test results at elevated temperatures.
The effect of local buckling on the bending behaviour after the maximum bending strength in high-temperature regions was quantified. Two types of calculation models were proposed to evaluate the theoretical bending strength after local buckling.
The authors are thankful for funding from the Japan Iron and Steel Federation and for their valuable support.
Zhao, X., Ozaki, F., Hirashima, T., Kimura, K., Murakami, Y., Suzuki, J.-i. and Yotsumoto, N. (2022), "Bending-strength evaluation of wide-flange steel beams subjected to local buckling at elevated temperatures", Journal of Structural Fire Engineering, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/JSFE-02-2022-0006
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