高强度钢材疲劳性能研究进展  

Research progress on fatigue properties of high strength steels

作　　者：郭宏超 毛宽宏[2] 万金怀 郝际平 李慎[1,2] 王振山 GUO Hongchao;MAO Kuanhong;WAN Jinhuai;HAO Jiping;LI Shen;WANG Zhenshan(Shaanxi Key Laboratory of Loess Mechanics and Engineering,Xi'an 710048,China;School of Civil Engineering,Xi'an University of Technology,Xi'an 710048,China;Pipeline and Pipe Gallery Engineering Institute,MCC Jingcheng Engineering Technology Co.,Ltd,Beijing 100176,China;Department of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]陕西省黄土力学与工程重点实验室,陕西西安710048 [2]西安理工大学土木建筑工程学院,陕西西安710048 [3]中冶京诚工程技术有限公司管线与管廊工程技术所,北京100176 [4]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《建筑结构学报》2019年第4期17-28,共12页Journal of Building Structures

基　　金：陕西省科技厅自然科学基础研究面上项目(2018JM5006);陕西省教育厅重点实验室科研项目(18JS072);铁一院科学研究计划项目(院科16-59-01)

摘　　要：疲劳破坏是钢结构失效的主要形式,也是工程界与学术界关注的重点。在总结了国内外高强钢母材、焊缝连接和螺栓连接的疲劳性能研究现状基础上,介绍了疲劳寿命理论计算方法,结合大量试验数据分析统计了高强度钢材疲劳寿命发展规律,并基于国内外不同的疲劳设计规范对高强钢母材及连接接头的抗疲劳能力进行了评估。结果表明:随着钢材强度等级的提高,高强钢母材表现出较好的疲劳性能,规范设计曲线偏于保守,明显低估了高强钢母材的抗疲劳性能;受焊接工艺和焊接质量影响,高强钢焊缝连接的疲劳强度提高幅度较小,ANSI/AISC 360-10和EN 1993-1-9规范曲线能够较好地评估Q460D与Q690D焊缝连接的疲劳特性,并具有足够的安全储备;螺栓连接的疲劳强度受预紧力、摩擦面处理、成孔方式等众多因素影响,已有研究表明随着钢材强度的提高,疲劳强度亦有改善,ANSI/AISC 360-10和BS 7608-2014设计曲线适用于Q460螺栓连接疲劳寿命计算,具有足够安全保障,对于Q690钢螺栓连接疲劳性能评估,规范方法偏于保守。随着高强度钢材在实际工程中的应用增多,需开展大量不同等级高强钢母材和连接形式的疲劳试验,补充Q460及以上强度钢材的疲劳设计方法和细部连接构造。Fatigue failure is the main form of failure of steel structures,and has attracted great attention from engineering and academia.The paper summarized the status of research,nationally and internationally,on the fatigue properties of high strength steel base metal,weld joints and bolt connections,and introduced the theoretical calculation method for the fatigue life.Based on a large number of test data,the development rules of fatigue life of high strength steels were analyzed.The fatigue resistance of high strength steel base metals and joints was evaluated based on different the relevant national and international design codes.The results show that the fatigue performance of high strength steel base materials increases with the strength grade of steel.The normative design curve is conservative and significantly underestimates the fatigue resistance of high strength steel base metals.Due to the welding process and welding quality,the fatigue strength of high strength steel weld joints does not increase as significantly with the strength grade as the base materials.The design curves specified in the ANSI/AISC 360-10 and the EN 1993-1-9 codes can provide a good estimate of the fatigue properties of the Q460 D and Q690 D weld joints and have sufficient safety reserves.The fatigue strength of bolted joints is affected by many factors such as the pre-tightening force,treatment of friction surface and hole forming method.It has been shown that the fatigue strength increases with the steel strength.The design curves specified in the ANSI/AISC 360-10 and the BS 7608-2014 codes are suitable for the fatigue life calculation of Q460 bolt connections,with sufficient safety guarantee.For the evaluation of fatigue properties of Q690 steel bolt connections,the code method is conservative.With the increasing application of high strength steel in practical engineering,it is necessary to carry out a large number of fatigue tests of different grades of high strength steel base metal and joint forms,and timely supplement the fatigue

关 键 词：高强钢 焊缝连接 螺栓连接 疲劳寿命 裂纹扩展速率 容许应力幅 

分 类 号：TU391[建筑科学—结构工程]