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Creep behavior and model of high-strength steels over 500 MPa at elevated temperatures
Abstract In fire events, the high-temperature creep behavior of steels may critically affect the fire resistance of steel structures. Most studies related to high-temperature creep behavior have been typically performed for normal structural steels but seldom conducted for high-strength structural steels. In this study, a series of high-temperature steady-state creep tests is conducted on Q550, Q690, and Q890 high-strength structural steels at various stress levels within the 400–800 °C temperature range. The test data obtained demonstrate that the total amount of creep deformation is relatively significant, and the increase in the creep strain rate is considerably rapid at high-temperatures and high-stress levels. The three-stage creep model, together with creep parameters, is proposed to express the creep behaviors of three high-strength steels at various stress levels within the 400–800 °C temperature range. The creep behavior and calibrated creep models obtained in this research can be utilized as a theoretical foundation for accurately predicting the response of high-strength steel structures exposed to fire considering the effect of creep.
Highlights High temperature creep tests are performed on three different high-strength steels including Q550, Q690, Q890 steels. Creep development of high strength steel greatly depends on temperature and stress levels. Creep strain rate increases with increasing temperatures (400 °C–700 °C) for the same stress ratio. Under high stress ratio (>0.6) and high temperature (> 700 °C), creep strain rate curves of high strength steels demonstrate three stages of creep development process. A simplified three-stage creep model is proposed by including influence of stress and temperature.
Creep behavior and model of high-strength steels over 500 MPa at elevated temperatures
Abstract In fire events, the high-temperature creep behavior of steels may critically affect the fire resistance of steel structures. Most studies related to high-temperature creep behavior have been typically performed for normal structural steels but seldom conducted for high-strength structural steels. In this study, a series of high-temperature steady-state creep tests is conducted on Q550, Q690, and Q890 high-strength structural steels at various stress levels within the 400–800 °C temperature range. The test data obtained demonstrate that the total amount of creep deformation is relatively significant, and the increase in the creep strain rate is considerably rapid at high-temperatures and high-stress levels. The three-stage creep model, together with creep parameters, is proposed to express the creep behaviors of three high-strength steels at various stress levels within the 400–800 °C temperature range. The creep behavior and calibrated creep models obtained in this research can be utilized as a theoretical foundation for accurately predicting the response of high-strength steel structures exposed to fire considering the effect of creep.
Highlights High temperature creep tests are performed on three different high-strength steels including Q550, Q690, Q890 steels. Creep development of high strength steel greatly depends on temperature and stress levels. Creep strain rate increases with increasing temperatures (400 °C–700 °C) for the same stress ratio. Under high stress ratio (>0.6) and high temperature (> 700 °C), creep strain rate curves of high strength steels demonstrate three stages of creep development process. A simplified three-stage creep model is proposed by including influence of stress and temperature.
Creep behavior and model of high-strength steels over 500 MPa at elevated temperatures
Li, Guo-Qiang (author) / Wang, Xin-Xin (author) / Zhang, Chao (author) / Cai, Wen-Yu (author)
2020-02-16
Article (Journal)
Electronic Resource
English
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