摘要
为了研究温度和应力变化历史对钢材高温性能的影响,采用MTS809和MTS653试验系统对我国建筑结构中常用的Q235钢材进行了不同温度-应力路径下的材料高温性能试验。其中用MTS809系统控制试件荷载大小,用MTS653系统控制试件温度变化,两套试验系统同时使用,从而可以同步测得试件在各个时刻的应力、应变和温度值。试验得到Q235钢材在各种不同温度-应力路径下的性能以及应力(应力增量)与应变(应变增量)、温度(温度增量)与应变(应变增量)之间的相对变化规律曲线,结果表明同一种钢材在不同路径下表现出各不相同的材料性能,其应力、应变和温度三者之间呈现出不同的关系。从而提出了钢材的高温性能不仅与温度状态有关,还受温度-应力历史的影响,采用因路径而异的应力、应变、温度三者关系进行钢结构高温性能分析将更为精确。
To study the effect of temperature and stress history on material properties,tests were carried out on Q235 steel under different temperature-stress paths using the MTS809 and MTS653 experimental system.The MTS809 was used to control stress of the specimen and the MTS653 to control the temperature,operating simultaneously so that the stress,strain and temperature can be measured at the same time.The material properties of Q235 steel and the variations of stress,temperature and strain,or stress increment,temperature increment and strain increment,under every path were obtained from the tests.The results indicated that the material exhibits various properties under different paths,and the relationships among stress,strain and temperature were different.It is concluded that the high temperature properties of steel material are influenced by not only temperature but also temperature and stress history,and it would be more accurate to use the diverse relationship among stress,strain and temperature according to different paths for fire resistance analysis of steel structures.
出处
《土木工程学报》
EI
CSCD
北大核心
2010年第1期29-34,共6页
China Civil Engineering Journal
基金
国家自然科学基金资助项目(50578093)
关键词
Q235钢
材料性能
不同路径
高温
影响
Q235 steel
mechanical properties
multi-paths
elevated temperature
effect
