Abstract
Predicted ultimate temperatures of steel frames in fire are derived based on the plastic nature of frames of stress redistribution and redundancy, which is applicable to practical fire resistance design. The primary ultimate temperatures of portal as well as multi-story frames are determined with simple calculation. Comparing these with refined numerical solutions verifies applicability of the method of prediction to practice. With this method and numerical verification, theoretical buckling temperatures are found to be also useful in practice for heated columns. As an application of this prediction, post-earthquake fire resistance of steel frames is clarified in terms of ultimate temperature of pre-drifted frames, which is as high as the ultimate temperature intact frames show, if fire is limited within not so enlarged space on the floor. Thermal post-earthquake resistance of two-ply gypsum board wall is also studied based on loading and subsequent heating tests. Although the present prescription for dry walls is found insufficient to make pre-damaged walls fire resistant if damage is not slight, an easy and practical improved construction is also shown to keep damaged walls from premature failure in fire.
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Abbreviations
- E, E t :
-
Young’s and tangent moduli resp. (N/mm2)
- F :
-
Lifting up force of key beams (N)
- l :
-
Full span length of a beam (mm)
- l eff :
-
Effective buckling length of a column (mm)
- M pB ,M pC :
-
Full plastic moments of a beam and column resp. (m)
- N :
-
Post-buckling residual strength of a column (N)
- P :
-
Compressive force a column carries (N)
- q :
-
Uniform beam load (N/mm)
- T :
-
Member temperature (°C)
- ∈,∈ y :
-
Strain and yield strain of steel at ambient temp. resp.
- κ :
-
Ratio of residual high temp. Yield strength of steel to that at ambient temp.
- λ:
-
Normalized slenderness ratio of a column
- σ, σy :
-
Stress and yield stress of steel at ambient temp. resp.
References
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Suzuki, H. (2017). Ultimate Strength and Its Application to Post-Earthquake Fire Resistance of Steel Frames in Fire. In: Harada, K., Matsuyama, K., Himoto, K., Nakamura, Y., Wakatsuki, K. (eds) Fire Science and Technology 2015. Springer, Singapore. https://doi.org/10.1007/978-981-10-0376-9_3
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DOI: https://doi.org/10.1007/978-981-10-0376-9_3
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