Mechanical properties of high-strength Q960 steel at elevated temperature

• Published in: Fire safety journal Vol. 114; pp. 103010 - 9
• Main Authors: Wang, Weiyong, Zhang, Yanhong, Xu, Lei, Li, Xiang
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier Ltd 01.06.2020; Elsevier BV
• Subjects: Building design; Design standards; Deterioration; Elevated temperature; Fire resistance; Heat resistance; High rise buildings; High strength low alloy steels; High strength steel; High temperature; Material properties; Mechanical properties; Modulus of elasticity; Q960 steel; Strain; Stress-strain relationships; Stress–strain curve; Temperature; Temperature effects; Tension test; Ultimate tensile strength; Mechanical properties; Elevated temperature; Q960 steel; High-strength steel; Tension test; Stress–strain curve
• ISSN: 0379-7112; 1873-7226
• DOI: 10.1016/j.firesaf.2020.103010

This study experimentally investigates the temperature-induced deterioration in the mechanical properties of high-strength Q960 steel. High-strength steel has numerous advantages compared with conventional mild-strength steel and has gained wide applications in engineering structures, particularly in high-rise and long-span buildings. The fundamental issue in the fire-resistance design of high-rise or long-span steel buildings is the evaluation of mechanical properties under elevated temperature. There is little information on the temperature-induced mechanical-property deterioration of Q960 steel because of the limited research on this subject. To bridge this knowledge gap, a series of tensile coupon tests on Q960 steel was carried out under various temperatures from 20 to 900 °C to obtain the corresponding stress–strain relationships, yield strength, ultimate strength, and elastic modulus at elevated temperatures. The test results were compared with the results of other high-strength steel types such as Q460, Q690, and S960 steels reported in previous studies as well as the mechanical properties recommended in applicable design codes or standards. The comparison showed that the effects of temperature on the mechanical properties among different types of high-strength steels are different. New predictive equations for evaluating the material properties of Q960 steel at elevated temperatures were presented. •Tensile tests on mechanical properties of high strength Q960 steel at elevated temperature exposure were presented.•Comparisons on mechanical properties among various high strength steels and design specifications were discussed.•Equations to predict the mechanical properties reduction of high strength Q960 steel at elevated temperatures were proposed.•Stress-strain relationships of high strength Q960 steel at elevated temperatures were established.