摘要
精确掌握材料高温下的性能参数,对结构抗火设计的准确性具有十分重要的意义。以S30408奥氏体不锈钢为研究对象,在现有S30408不锈钢高温材料性能试验的基础上,研究发现S30408不锈钢在同种条件下,相比碳钢具有较低的升温速率,且S30408不锈钢在600℃时仍能保持50%以上的强度与刚度。但不锈钢具有更大的热膨胀率,高温给结构的稳定性带来的威胁更大。其次,对比分析了国内外学者所提出的常温及高温下不锈钢的本构模型,根据S30408不锈钢高温下性能参数的变化规律,欧洲规范给出的建议值偏不安全,建议在不锈钢结构设计中采用Rasmussen模型,在结构抗火的数值模拟分析中采用Chen和Young的模型。
In structural fire resistance design,the material propertie at elevated temperature is important for accurate evaluations.In this paper,S30408austenitic stainless steel is analyzed.It can be found that S30408stainless steel has lower heating rate than carbon steel under the same condition,based on a large number of material tests at elevated temperatures.Also,S30408stainless steel can remain over 50%of strength and stiffness at 600℃.But the stainless steel has a higher thermal expansion rate,and thus high temperature has a larger threat to structural stability.Secondly,the constitutive models of stainless steel at room temperature and elevated temperature proposed by domestic and foreign scholars are compared.According to the variation of performance parameters of S30408stainless steel at high temperature,the recommended value given by European specification is relatively unsafe.Rasmussen model is suitable for stainless steel architectural design,but Chen and Young model is suitable for fire simulation of stainless steel component.
作者
谢宝超
郭晨阳
张世权
王强华
郑思宇
罗俊礼
XIE Baochao;GUO Chenyang;ZHANG Shiquan;WANG Qianghua;ZHENG Siyu;LUO Junli(School of Civil Engineering,Central South University,Changsha 410075,China;Teaching Department of Science and Technology,Hunan Radio and Television University,Changsha 410004,China)
出处
《建筑钢结构进展》
CSCD
北大核心
2021年第2期53-61,共9页
Progress in Steel Building Structures
基金
湖南省重点研发计划项目(2017SK2211)
湖南省教育厅科学研究项目(16C1077)。
关键词
不锈钢
高温材料性能
本构模型
热膨胀率
stainless steel
high-temperature material property
constitutive model
thermal expansion rate
