高温下不锈钢螺栓的材料性能试验研究  

Mechanical properties of stainless steel bolts at elevated temperatures

作　　者：张筠 林辉 胡鹰[1] 杨成博[1] Zhang Jun;Lin Hui;Hu Ying;Yang Chengbo(School of Civil Engineering,Chongqing University,Chongqing 400045,P.R.China)

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《土木与环境工程学报（中英文）》2020年第2期143-148,共6页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(51578092);重庆市基础与前沿研究计划(cstc2016jcyjA1097)。

摘　　要：为了给建筑钢结构螺栓连接的抗火性能分析与抗火设计提供依据,对不锈钢螺栓高温下的力学性能进行试验研究,开展了两组不同等级不锈钢螺栓高温下的拉伸试验,得到了不同温度下不锈钢螺栓的全应力应变曲线。对不锈钢螺栓高温下的弹性模量、屈服强度和极限强度进行分析,将试验结果与不锈钢母材和耐火钢螺栓在高温下力学性能进行了对比,并对比相关规范关于不锈钢母材的推荐值,提出了不锈钢螺栓高温下弹性模量、屈服强度和极限强度的折减模型。研究结果表明:不锈钢螺栓高温下的极限强度折减系数与欧洲规范EC3中对不锈钢母材的推荐值相近,弹性模量折减系数差距较大。温度低于650℃时,不锈钢螺栓相比不锈钢母材屈服强度下降更慢;温度在500~900℃时,不锈钢螺栓相比耐火钢螺栓强度和弹性模量下降更慢。To provide the basis for the analysis and design of fire-resistance of bolt connections in steel building,the mechanical properties of the stainless steel bolt at elevated temperature were studied.Two groups of stainless steel bolts with different grades were tested to obtain the full stress-strain curve of stainless steel bolts at different temperatures.The Young’s modulus,0.2% proof strength and tensile strength of stainless steel bolts were derived.The test results were compared with the mechanical properties of the parent materials and fire-resistant bolts at elevated temperatures,and the recommended values for parent materials in relevant design standards.Based on the experimental data,reduction factors models for tensile strength,Young’s modulus and 0.2% proof strength are proposed in this paper for stainless steel bolts at elevated temperatures.The test results shows that the tensile strength degradation of stainless steel bolts at elevated temperatures are found to be rather close to those recommended by Eurocode 3 for their parent materials,but the reduction factors of Young’s modulus are of great discrepancy.When temperatures lower than 650 ℃,the 0.2% proof strength of stainless steel bolts decreases more slowly than that of their parent materials.In the temperature range of 500 to 900℃,the stainless steel bolts retain their tensile strength,Young’s modulus and 0.2% proof strength better than fire-resistant bolts.

关 键 词：不锈钢 螺栓 高温 弹性模量折减 强度折减 

分 类 号：TU317.3[建筑科学—结构工程]