TY - JOUR
T1 - Post-fire mechanical response of Q960E ultra-high-strength structural steel
AU - Shen, Le
AU - Ding, Miao
AU - Yao, Wancheng
AU - Yang, Bo
AU - Wang, Fan
AU - Ran, Chunhua
AU - Elchalakani, Mohamed
N1 - Funding Information:
The authors would like to gratefully acknowledge the support of this research provided by the Chinese National Natural Science Foundation (Grant No. 52078079 ), the Natural Science Funds for Distinguished Young Scholar of Chongqing (No. cstc2020jcyj-jqX0026 ), and the Chongqing Talents Plan for Young Talents (No. CQYC201905055 ). The authors also appreciate to the research engineer Ge Yi-Qing help to revise the grammar.
Publisher Copyright:
© 2022
PY - 2023/2
Y1 - 2023/2
N2 - The ultra-high-strength steel (UHSS) has gained significant attention in recent years owing to its prominent benefits in structural performance, economics and environmental aspect. The fire resistance of steel structures is always of great concern as the mechanical properties of steel are sensitive to high temperatures which could threaten the safety of the steel structures, and so do UHSS structures. The post-fire mechanical performance of steel is crucial for evaluating the residual capacity of the structure. Therefore, it is also necessary to evaluate the post-fire mechanical properties of UHSS. In this study, tensile tests were carried out to investigate the post-fire mechanical properties of Q960E UHSS with two types of cooling techniques, i.e. cooling in air or cooling in water. The residual elastic modulus, yield stress, tensile strength, tensile strain, rupture stress, and percentage reduction of area of Q960E UHSS subjected to various temperature levels were obtained from the post-fire stress-strain curves. The influence of the cooling techniques and temperature level on the post-fire mechanical properties of Q960E UHSS were discussed, and some empirical predictive equations were proposed for evaluating the post-fire mechanical properties. Finally, a novel stress-strain model was also proposed to predict the post-fire response of Q960E UHSS. The proposed model showed good consistency with laboratory experimental results. Therefore, it is concluded that the model can provide accurate predictions for the plastic strain-true stress curve for various types of steels.
AB - The ultra-high-strength steel (UHSS) has gained significant attention in recent years owing to its prominent benefits in structural performance, economics and environmental aspect. The fire resistance of steel structures is always of great concern as the mechanical properties of steel are sensitive to high temperatures which could threaten the safety of the steel structures, and so do UHSS structures. The post-fire mechanical performance of steel is crucial for evaluating the residual capacity of the structure. Therefore, it is also necessary to evaluate the post-fire mechanical properties of UHSS. In this study, tensile tests were carried out to investigate the post-fire mechanical properties of Q960E UHSS with two types of cooling techniques, i.e. cooling in air or cooling in water. The residual elastic modulus, yield stress, tensile strength, tensile strain, rupture stress, and percentage reduction of area of Q960E UHSS subjected to various temperature levels were obtained from the post-fire stress-strain curves. The influence of the cooling techniques and temperature level on the post-fire mechanical properties of Q960E UHSS were discussed, and some empirical predictive equations were proposed for evaluating the post-fire mechanical properties. Finally, a novel stress-strain model was also proposed to predict the post-fire response of Q960E UHSS. The proposed model showed good consistency with laboratory experimental results. Therefore, it is concluded that the model can provide accurate predictions for the plastic strain-true stress curve for various types of steels.
KW - A novel stress-strain model
KW - Finite element model
KW - Mechanical properties
KW - Post-fire
KW - Q960E UHSS
UR - http://www.scopus.com/inward/record.url?scp=85144050952&partnerID=8YFLogxK
U2 - 10.1016/j.jcsr.2022.107729
DO - 10.1016/j.jcsr.2022.107729
M3 - Article
AN - SCOPUS:85144050952
SN - 0143-974X
VL - 201
JO - Journal of Constructional Steel Research
JF - Journal of Constructional Steel Research
M1 - 107729
ER -