中文摘要：

通过对Q460GJ钢板（厚度为8,10 mm）进行高温材料性能试验,重点对Q460GJ钢高温应力-应变关系、屈服强度、极限强度进行研究。试验发现：随着温度升高,结构钢强度在300℃之前变化并不明显,而在此之后强度呈下降趋势。将试验结果与不同强度结构钢及其他国家技术标准进行的比较发现：Q460GJ钢比Q235及Q345钢和国外同等强度钢S460具有更好耐火性能,CECS 200∶2006《建筑钢结构防火设计规范》和欧洲钢结构设计技术标准EN 1993所给出的强度折减系数可以用于Q460的抗火设计。还进一步提出了高温下Q460GJ钢的材料模型,为更深入地研究钢构件及结构的耐火性能提供了依据。

英文摘要：

This paper presented material properties test of structural steel Q460 GJ for different thicknesses（ 8 mm and 10 mm） at elevated temperatures,which is utilized in China construction market,including investigations on stress-strain relationships,yield and ultimate strengths of Q460 GJ. Below 300 ℃,strength reduction of this type of structural steel was not significant. At the temperatures over 300 ℃,steel strength reduced significantly. Compared with design standards and other carbon steels produced in China and UK,it was clear that performance of Q460 GJ structural steel under elevated temperatures is better than Q235 and Q345 used in China and S460 used overseas. It was also found that reduction factors recommended in the current Design Standards on Steel Structures Under Fire（ CECS 200 ∶ 2006） and EN 1993 in Europe could be applied to Q460 GJ structural steel. A material model for Q460 GJ structural steel was also proposed,which provided a basis for studying further the fireproof performance of steel components and structures.