纵肋与横隔板新型构造细节焊接残余应力分布研究  

Research on Distribution Characteristics of Welding Residual Stress at Innovative Rib-to-Diaphragm Detail

作　　者：卜一之[1] 吴亚坤 胡广瑞 王宝州 BU Yi-zhi;WU Ya-kun;HU Guang-rui;WANG Bao-zhou(Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Design Group Co.,Ltd.,Nanjing 210014,China;China Railway Shanhaiguan Bridge Group Co.,Ltd.,Qinhuangdao 066205,China)

机构地区：[1]西南交通大学桥梁工程系,四川成都610031 [2]华设设计集团股份有限公司,江苏南京210014 [3]中铁山桥集团有限公司,河北秦皇岛066205

出　　处：《桥梁建设》2020年第6期39-45,共7页Bridge Construction

基　　金：国家自然科学基金项目(51578455,51778533,51878561,51978579);“十二五”国家科技支撑计划项目(2011BAG07B03);湖北省交通运输厅科技项目(2017-538-2-4)。

摘　　要：为了解在正交异性钢桥面板中将纵肋底板与横隔板焊接的新型构造细节疲劳性能,对纵肋与横隔板构造部位的焊接过程进行数值模拟,分析新型构造细节与传统构造细节焊接残余应力的分布特征;通过改变焊接顺序,研究焊缝生成顺序对新型构造细节残余应力分布的影响。结果表明:新型构造细节的纵、横向残余应力较传统构造细节均有大幅降低,纵肋底板围焊端部焊趾附近纵横向残余应力均达到220 MPa以上,极易成为新的疲劳易损部位;改变新型构造细节纵肋腹板与底板的焊接顺序,仅影响残余应力数值,合理的焊接顺序为先焊纵肋腹板,后焊纵肋底板。In the orthotropic steel deck plate,the base of U-ribs and diaphragms are suggested to weld together.To examine the fatigue performance of this innovative type of connection,the forming process of the welds between U-ribs and Diaphragms was numerically simulated to compare and analyze the distribution characteristics of welding residual stresses in both the suggested structural details and the traditional U-rib and Diaphragm connection details.The welding procedure was deliberately changed during simulation to examine the influence of weld forming sequence on the residual stress distribution in the suggested structural details.The results show that when the base of U-ribs and diaphragms are welded together,the longitudinal and transverse residual stresses can be greatly reduced.The longitudinal and transverse residual stresses near weld toes in U-rib base can reach up to or more than 220 MPa,indicating that the innovative connection details are much more likely to be new fatigue-sensitive locations.The change of welding sequence of the walls and base of U-rib only exerts influence on the values of residual stresses.Therefore,the walls of U-rib should be welded ahead of the base.

关 键 词：正交异性钢桥面板 疲劳 纵肋与横隔板构造细节 焊接 残余应力 数值模拟 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]