%0 Journal Article
%T 国产超高强钢Q890高温力学性能试验<br>Experiment on Mechanical Properties of Domestic Ultra？？high Strength Steel Q890 at Elevated Temperatures
%A 李国强
%A 黄
%A 雷
%A 张
%A 超
%J 建筑科学与工程学报
%D 2018
%X 通过稳态拉伸试验法对国产超高强钢Q890在不同火灾高温条件下的力学性能进行了试验研究，得到高温下钢材的力学性能参数、应力-应变关系曲线和试验现象，并将所得试验结果与钢结构抗火设计规范及相关超高强钢研究文献中高温材料模型结果进行比较。分别采用多项式模型和钢材高温通用材料模型对试验结果进行数值拟合，建立高温下Q890钢力学性能参数的材料模型。结果表明：不同温度条件下的Q890钢试件在试验后有明显不同的外观特征，相应的应力-应变关系曲线基本形状差异较大；当受热温度低于500 ℃时，弹性模量和强度随温度升高逐步减小，断后伸长率变化不大；超过500 ℃后，弹性模量和强度下降速率明显加快，断后伸长率急剧增大；所建立的模型为研究Q890钢结构抗火性能及其计算方法提供理论基础。<br>By steady-state test, an experimental study was conducted on the mechanical properties of domestic ultra-high strength steel Q890 under different fire temperature. The mechanical properties, stress-strain curves and experimental phenomena at elevated temperatures were obtained. The experimental results were compared with high temperature material models determined by fire resistant design of steel structures and literature on ultra-high strength steel. In order to obtain the mathematical models for mechanical properties of Q890 at elevated temperature, polynomial model and high temperature material model proposed by National Institute of Standards and Technology were employed for fitting the experiment data. The results show that the specimens with different temperatures have different appearance characteristics after the tests and different basic shapes of stress-strain curves. When the temperature is below 500 ℃, the elastic modulus and strength slightly decrease, and the elongation changes little. When the temperature is over 500 ℃, the declines of elastic modulus and strength obviously accelerate, and the elongation increases rapidly. The material models can be used for fire resistance of Q890 steel structure
%K 国产超高强钢
%K 高温
%K 稳态试验
%K 力学性能
%K 材料模型&lt
%K br&gt
%K domestic ultra-high strength steel
%K high temperature
%K steady-state test
%K mechanical property
%K material model
%U http://jace.chd.edu.cn/oa/DArticle.aspx?type=view&id=20180301