摘要
通过3组共9个试件的疲劳试验,研究沪通长江大桥主桁对接杆件中过焊孔构造细节的疲劳性能,通过扩展有限元方法(XFEM)结合断裂力学方法对过焊孔构造细节裂纹扩展阶段的疲劳寿命进行预测。研究结果表明:过焊孔与翼缘板-腹板焊缝交叉处的焊趾是过焊孔构造细节疲劳性能的薄弱环节;试验测得该细节对应200万次荷载循环的疲劳强度小于欧洲规范对类似构造细节的规定,过焊孔处腹板-翼缘板的角焊缝质量对构造细节的疲劳强度有重要影响;采用XFEM结合断裂力学方法预测疲劳裂纹扩展阶段的寿命与测试结果较吻合,可以作为疲劳寿命评估的手段。
Fatigue tests of 9 specimens in 3 groups were conducted to study the fatigue performance of the cope hole weld detail of Shanghai Yangtze River Bridge.The residual fatigue life of the cope hole weld detail during the crack growth stage was evaluated by XFEM.The results show that the weld toes at the joint between the cope hole and webs and flanges are the weak points of the weld detail.The fatigue strength of the weld detail corresponding to 2 million load cycles is smaller than that specified by Eurocode 3 for similar structural details,showing that the quality of fillet weld between webs and flanges will greatly impact the fatigue strength.The fatigue life predicted by XFEM matches well with the test results,indicating that XFEM is a potential fatigue life estimation approach for steel bridges.
作者
肖林
刘丽芳
李小珍
徐伟
王聪
XIAO Lin;LIU Lifang;LI Xiaozhen;XU Wei;WANG Cong(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of High-speed Railway Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;China Railway Major Bridge Reconnaissance&Design Institution Co.,Ltd.,Wuhan 430000,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2018年第4期113-119,共7页
Journal of the China Railway Society
基金
中央高校基本科研业务费专项资金(2682016CX016)
关键词
钢桁梁
焊接细节
过焊孔
疲劳性能
XFEM
疲劳寿命评估
steel truss bridge
weld details
cope hole
fatigue performance
XFEM
fatigue life estimation
