工程科学学报，第39卷，第9期：1428-1435,2017年9月 Chinese Journal of Engineering,Vol.39,No.9:1428-1435,September 2017 D0l:10.13374/j.issn2095-9389.2017.09.017:htp:/journals..usth.edu.cn HTRB600级高强钢筋高温下的力学性能 公 伟区，胡克旭，王懿迪 同济大学结构工程与防灾研究所，上海200092 ☒通信作者，E-mail:weig0ng890413@q4.com 摘要为研究6O0MPa级高强钢筋高温下的力学性能，对HTRB6O0级热处理高强钢筋进行高温下的拉伸试验，分别测得其 在20,200,300,400,500,600,700及800℃高温下的弹性模量、比例极限、屈服强度、极限强度及应力-应变曲线.试验结 果表明：HTRB600级高强钢筋高温下屈服强度、极限强度、比例极限与弹性模量均随着温度的升高而显著降低.500℃时其高 温下的弹性模量、比例极限、屈服强度与极限强度降低为不足常温下的50%，800℃时已不足常温下的10%.高温下 HTRB600级高强钢筋应力-应变曲线随温度的升高逐渐趋于圆滑，当温度达到200℃时，屈服台阶就已消失.600MP级钢筋 高温下屈服强度和极限强度的降低程度明显大于其他钢筋5 00 MPa以下强度的钢筋.最后提出了适用于HTRB6O0级高强钢 筋的高温下应力-应变曲线简化计算模型. 关键词HTRB6O0高强钢筋；高温下；力学性能；简化计算模型 分类号TU375 Mechanical properties of high-strength HTRB600 steel bars under high temperature GONG Wei,HU Ke-xu,WANG Yi-di Research Institute of Structural Engineering and Disaster Reduction,Tongji University,Shanghai 200092.China Corresponding author,E-mail:weigong890413@qq.com ABSTRACT Tensile testing of HTRB600 steel bars under high temperature was conducted to determine the mechanical properties of the steel under high temperature.The elastic modulus,proportional limit,yield strength,ultimate strength,and stress-strain curves of steel bars at 20,200,300,400,500,600,700,and 800C were obtained.The experimental results show that the elastic modu- lus,proportional limit,yield strength,and ultimate strength of the bars obviously decrease with increasing temperature.The yield strength,ultimate strength,proportional limit,and elastic modulus of the steel bars at 500 and 800C decrease to less than 50%and 10%,respectively,of those of the sample at room temperature.The stress-strain curve of the steel bars smoothens as the temperature increases,and the yield terrace disappears at 200 C.The degree of decrease in yield strength and ultimate strength of the 600 MPa steel bar is obviously larger than that of the <500 MPa steel bar.Finally,a simplified calculation method to determine the stress- strain curve of HTRB600 steel bars under high temperature was proposed. KEY WORDS HTRB600 high-strength steel bar;under high temperature;mechanical properties;simplified calculation method 建筑火灾是一类严重损害建筑物的多发灾害，每 现行的建筑防火规范都是针对普通钢筋混凝土结 年都会造成巨大的生命财产损失.钢筋混凝土结构是 构[3-】，而高强钢筋与普通钢筋的高温性能并不相同， 工程中应用最为广泛的建筑结构形式，对普通钢筋及 随着高强钢筋在混凝土结构中的应用普及，对高强钢 配置普通钢筋的混凝土结构高温下及高温后的性能研 筋的抗火性能研究迫切需要 究已有很多川，而对高强钢筋的抗火研究相对较少). 近年来对高强钢筋抗火性能的相关研究主要集中 收稿日期：2016-12-23 基金项目：国家自然科学基金资助项目(51478362)工程科学学报,第 39 卷,第 9 期:1428鄄鄄1435,2017 年 9 月 Chinese Journal of Engineering, Vol. 39, No. 9: 1428鄄鄄1435, September 2017 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2017. 09. 017; http: / / journals. ustb. edu. cn HTRB600 级高强钢筋高温下的力学性能 公 伟苣 , 胡克旭, 王懿迪 同济大学结构工程与防灾研究所, 上海 200092 苣通信作者, E鄄mail: weigong890413@ qq. com 摘 要 为研究 600 MPa 级高强钢筋高温下的力学性能,对 HTRB600 级热处理高强钢筋进行高温下的拉伸试验,分别测得其 在 20, 200, 300, 400, 500, 600, 700 及 800 益高温下的弹性模量、比例极限、屈服强度、极限强度及应力鄄鄄应变曲线. 试验结 果表明:HTRB600 级高强钢筋高温下屈服强度、极限强度、比例极限与弹性模量均随着温度的升高而显著降低. 500 益时其高 温下的弹性模量、比例极限、屈服强度与极限强度降低为不足常温下的 50% ,800 益 时已不足常温下的 10% . 高温下 HTRB600 级高强钢筋应力鄄鄄应变曲线随温度的升高逐渐趋于圆滑,当温度达到 200 益时,屈服台阶就已消失. 600 MPa 级钢筋 高温下屈服强度和极限强度的降低程度明显大于其他钢筋 500 MPa 以下强度的钢筋. 最后提出了适用于 HTRB600 级高强钢 筋的高温下应力鄄鄄应变曲线简化计算模型. 关键词 HTRB600 高强钢筋; 高温下; 力学性能; 简化计算模型 分类号 TU375 Mechanical properties of high鄄strength HTRB600 steel bars under high temperature GONG Wei 苣 , HU Ke鄄xu, WANG Yi鄄di Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China 苣Corresponding author, E鄄mail: weigong890413@ qq. com ABSTRACT Tensile testing of HTRB600 steel bars under high temperature was conducted to determine the mechanical properties of the steel under high temperature. The elastic modulus, proportional limit, yield strength, ultimate strength, and stress鄄鄄strain curves of steel bars at 20, 200, 300, 400, 500, 600, 700, and 800 益 were obtained. The experimental results show that the elastic modu鄄 lus, proportional limit, yield strength, and ultimate strength of the bars obviously decrease with increasing temperature. The yield strength, ultimate strength, proportional limit, and elastic modulus of the steel bars at 500 and 800 益 decrease to less than 50% and 10% , respectively, of those of the sample at room temperature. The stress鄄鄄strain curve of the steel bars smoothens as the temperature increases, and the yield terrace disappears at 200 益 . The degree of decrease in yield strength and ultimate strength of the 600 MPa steel bar is obviously larger than that of the < 500 MPa steel bar. Finally, a simplified calculation method to determine the stress鄄鄄 strain curve of HTRB600 steel bars under high temperature was proposed. KEY WORDS HTRB600 high鄄strength steel bar; under high temperature; mechanical properties; simplified calculation method 收稿日期: 2016鄄鄄12鄄鄄23 基金项目: 国家自然科学基金资助项目(51478362) 建筑火灾是一类严重损害建筑物的多发灾害,每 年都会造成巨大的生命财产损失. 钢筋混凝土结构是 工程中应用最为广泛的建筑结构形式,对普通钢筋及 配置普通钢筋的混凝土结构高温下及高温后的性能研 究已有很多[1] ,而对高强钢筋的抗火研究相对较少[2] . 现行的建筑防火规范都是针对普通钢筋混凝土结 构[3鄄鄄5] ,而高强钢筋与普通钢筋的高温性能并不相同, 随着高强钢筋在混凝土结构中的应用普及,对高强钢 筋的抗火性能研究迫切需要. 近年来对高强钢筋抗火性能的相关研究主要集中