钢桥面板顶板与竖向加劲肋连接角焊缝疲劳试验  

Fatigue experimental investigation of steel bridge deck plate and vertical stiffener connection fillet weld

作　　者：田圆[1] 吉伯海[1] 杨沐野 傅中秋[1] 姜竹生[2] 

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]江苏省交通运输厅工程质量监督局,江苏南京210004

出　　处：《河海大学学报（自然科学版）》2014年第5期433-438,共6页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(51278166);高等学校博士学科点专项科研基金(20120094110009);江苏省交通科学研究计划(2013Y10-1)

摘　　要：为研究钢桥面板顶板与竖向加劲肋连接角焊缝的疲劳性能,采用机械型振动疲劳试验机对制作的9个试件进行等幅疲劳加载,并通过名义应力和热点应力2种方法对试件焊缝疲劳性能进行评价。试验结果表明:疲劳荷载作用下,试件疲劳裂纹开展路径均从焊趾处萌生、沿焊趾开展、最终垂直于焊趾沿板横向往两侧对称扩展。采用名义应力法时,试验结果均位于JSSC-G疲劳强度为50 MPa的S-N曲线上方;采用热点应力法时,试验结果均位于Eurocode 3规范疲劳强度为100 MPa的S-N曲线上方。建议本试验构件疲劳细节的角焊缝疲劳强度取名义应力50 MPa、热点应力100MPa。In order to study the fatigue performance of a steel bridge deck and a vertical stiffener connection fillet weld, a mechanical vibration fatigue testing machine was used to test nine specimens with constant amplitude fatigue loading, and the fatigue performance of the welds of the specimens was evaluated with two methods, the nominal stress and hot spot stress methods. The test results show that, under the fatigue load, the specimens’ fatigue crack initiation occurs on the weld toe, and then the cracks grow along the weld toe and finally extend in bilateral symmetrical manner along the plate transverse, which is perpendicular to the weld edge. With the nominal stress method, the test results are above the S-N curve in JSSC-G, which has a fatigue strength of 50 MPa. With the hot spot stress method, the test results are above the S-N curve in Eurocode 3 specification, which has a fatigue strength of 100 MPa. The results suggest that the fatigue strength of the fillet weld of the test specimens’ fatigue details should be set at 50 MPa for nominal stress and 100 MPa for hot spot stress.

关 键 词：钢桥面板 竖向加劲肋 角焊缝 疲劳试验 

分 类 号：TG405[金属学及工艺—焊接]