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Thermal creep effects on stability of steel columns in fire
Involved researchers
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Diego Somaini PhD Student |
Jacqueline Pauli
PhD Student |
Dr. Markus Knobloch |
Prof. Dr. Mario Fontana |
Abstract
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The resistance of steel columns subjected to fire is strongly influenced
by the temperature-dependent cross-sectional capacity considering local
buckling effects, global buckling effects and thermal creep effects.
Under fire conditions, steel members without fire protection heat up
quickly, primarily due to the typically high surface-to-volume ratio and
the high thermal conductivity of steel. Due to elevated temperatures
under fire conditions, the strength and stiffness of steel decreases
rapidly. Furthermore thermal creep has to be considered for temperatures
above approximately 400°C to 500°C. Commonly used analytical models used in fire design do not explicitly consider the effect of thermal creep on the structural stability of steel members subjected to fire. Comprehensive fundamental research on the influence of thermal creep on the cross section capacity as well as slender column and beam-column strength has not been performed so far. However, the research results achieved during a former research project as well as the few research results given in literature indicate that a comprehensive research in that important field is required for structural safety. The results of the former research project show the distinctive influence of thermal creep on the cross-sectional capacity and slender column and beam-column strength in fire. The promising results and findings of the former research will be extended and generalized by performing basic research on the influence of thermal creep on the fundamental structural stability behaviour of steel columns and beam-columns subjected to fire. The research project will provide a broad knowledge on the influence of thermal creep on the cross-sectional behaviour and buckling behaviour of steel members subjected to fire. The project will provide an experimental and numerical database and analytical models for the influence of thermal creep on the cross-sectional capacity and structural behaviour of steel columns and beam-columns subjected to fire. |
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Support
This project is kindly supported by the Swiss National Science Foundation (SNF).
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