基于结构应力法的碳钢焊接结构疲劳评估  

Fatigue Evaluation of Welded Steel Structures Based on Traction Structural Stress Method

作　　者：于帮龙 王苹[1,2] 刘永 宋晓国[1,3] 方洪渊 YU Banglong;WANG Ping;LIU Yong;SONG Xiaoguo;FANG Hongyuan(National key Laboratory of Precision Welding and Joining of Materials and structures,Harbin Institute of Technology,Harbin 150001,China;School of Ocean Engineering,Harbin Institute of Technology,Weihai 264209,China;Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology,Weihai 264209,China)

机构地区：[1]哈尔滨工业大学材料结构精密焊接与连接全国重点实验室,黑龙江哈尔滨150001 [2]哈尔滨工业大学(威海)海洋工程学院,山东威海264209 [3]哈尔滨工业大学(威海)山东省特种焊接技术重点实验室,山东威海264209

出　　处：《电焊机》2024年第8期64-70,共7页Electric Welding Machine

基　　金：国家科技重大专项(2019-Ⅶ-0004-0144)。

摘　　要：焊接结构服役安全与寿命一直备受关注,在断裂力学的基础上建立的Master S-N曲线适用于不同接头形式的焊接钢结构抗疲劳设计。文中基于网格不敏感性的结构应力法对正交异性桥面板、T型接头、平板和管板焊接结构进行了疲劳性能评估。在疲劳评估的过程中,量化分析了焊接变形、焊缝尺寸、焊后残余应力等因素对复杂焊接结构的影响,并分别以角变形、平均应力为修正系数对疲劳数据进行修正。结果表明,正交异性桥面板结构、考虑角变形后的T形接头、考虑残余应力影响的平板和管板结构的疲劳数据均处于Master S-N曲线的两倍误差带以内,证实Master S-N曲线是焊接结构抗疲劳设计的首选曲线。The service safety and service life of welded structures have always been concerned.The Master S-N curve established on the basis of fracture mechanics is suitable for the anti-fatigue design of steel welded structures with different types of joints.In this paper,the fatigue properties of orthotropic bridge decks,T-joints,plate and tube-plate welded structures are evaluated based on the mesh-insensitive structural stress method.In the process of fatigue assessment,the effects of welding deformation,weld size and residual stress on complex welding structures are quantitatively analyzed,and the fatigue data are modified with angular deformation and average stress as correction coefficients respectively.The results show that the fatigue data of orthotropic bridge deck,T-joint considering angular deformation,plate and tube-plate structure considering the effect of residual stress are all within a 95%confidence interval of Master S-N curve.It is proved that Master S-N curve is the preferred curve for anti-fatigue design of welded structures.

关 键 词：焊接钢结构 疲劳评估 Master S-N曲线 补焊 残余应力 

分 类 号：TG406[金属学及工艺—焊接]