Mechanical properties of Q355 hot-rolled steel during the entire fire process

被引：2

作者：

Jiang, Binhui ^{[1
]}

Qu, Yiqiu ^{[1
]}

Wang, Mengjie ^{[2
]}

Lou, Guobiao ^{[2
]}

Li, Guoqiang ^{[2
]}

机构：

[1] Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China

[2] Tongji Univ, Sch Civil Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China

来源：

JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH | 2024年 / 215卷

基金：

中国国家自然科学基金;

关键词：

Fire; Cooling stage; Steel; Mechanical property; Reduction factor; Influence coefficient; Constitutive model; MOMENT FRAMES; BEHAVIOR;

D O I：

10.1016/j.jcsr.2024.108565

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This study conducts steady-state tests to comprehensively examines the mechanical properties of Q355 hot -rolled steel throughout the entire fire process, including the cooling stage. Results show that the mechanical properties at the fire-cooling stage are influenced by both the peak heating temperature (Tp) and the tensile test temperature (Tt). Within a specific threshold value of Tp, the mechanical properties at the cooling stage of fire resemble those observed in the heating stage. However, when Tp surpasses this threshold value, notable disparities emerge between the mechanical properties of steel at the cooling and heating stages. The threshold temperatures for elastic modulus, ultimate strength, and ultimate strain are all 600 degrees C, while that for the yield strength f0.2 is 400 degrees C. A cooling stage influence coefficient is used to quantitatively portray the variance in mechanical properties between the cooling and heating stages of fire. Calculation formulas for the fire cooling stage influence coefficients were provided for the elastic modulus, yield strength f0.2, ultimate strength, and ultimate strain, respectively. Finally, a constitutive model for the entire fire process of Q355 steel was established.

引用

页数：15

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