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Residual mechanical properties of Q890 high-strength structural steel after exposure to fire
Highlights Tests on mechanical properties of Q890 steel after exposure to fire were presented. Effects of air and water cooling on residual properties were obtained. Microstructures of Q890 steel after fire exposure were examined. Equations to predict post-fire residual properties of Q890 steel were proposed.
Abstract Q890 high-strength structural steel has a promising application in engineering structures. However, little research has focused on its post-fire residual mechanical properties, which restricts its application extent. The present study aims to investigate the residual mechanical properties of Q890 high-strength quenched and tempered (QT) steel after exposure to fire. A series of experimental tests are conducted to obtain the post-fire stress-strain curves and microstructures of Q890 steel, considering the influence of temperature (room temperature to 1000 °C) and cooling methods (cooling in air and water). The residual elastic modulus, yield stress, ultimate tensile strength, ultimate strain, and microstructures were analyzed and discussed. A comparison of residual mechanical properties between Q890 steel and other high-strength QT structural steels was performed. Experimental results show that the post-fire mechanical properties are significantly dependent on temperature and cooling methods. Finally, empirical equations are proposed to predict the residual mechanical properties of Q890 steel, providing a basis for evaluating the post-fire performance of steel structures.
Residual mechanical properties of Q890 high-strength structural steel after exposure to fire
Highlights Tests on mechanical properties of Q890 steel after exposure to fire were presented. Effects of air and water cooling on residual properties were obtained. Microstructures of Q890 steel after fire exposure were examined. Equations to predict post-fire residual properties of Q890 steel were proposed.
Abstract Q890 high-strength structural steel has a promising application in engineering structures. However, little research has focused on its post-fire residual mechanical properties, which restricts its application extent. The present study aims to investigate the residual mechanical properties of Q890 high-strength quenched and tempered (QT) steel after exposure to fire. A series of experimental tests are conducted to obtain the post-fire stress-strain curves and microstructures of Q890 steel, considering the influence of temperature (room temperature to 1000 °C) and cooling methods (cooling in air and water). The residual elastic modulus, yield stress, ultimate tensile strength, ultimate strain, and microstructures were analyzed and discussed. A comparison of residual mechanical properties between Q890 steel and other high-strength QT structural steels was performed. Experimental results show that the post-fire mechanical properties are significantly dependent on temperature and cooling methods. Finally, empirical equations are proposed to predict the residual mechanical properties of Q890 steel, providing a basis for evaluating the post-fire performance of steel structures.
Residual mechanical properties of Q890 high-strength structural steel after exposure to fire
Zeng, X. (author) / Wu, W.B. (author) / Huo, J.S. (author) / Elchalakani, M. (author)
2021-08-21
Article (Journal)
Electronic Resource
English
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