摘要
制作6个顶板与竖向加劲肋连接细节试件,考虑了焊缝熔透率和加载应力幅进行疲劳等幅加载试验。通过比较应力幅变化速率,研究了两种焊缝(角焊缝和全熔透焊缝)试件的疲劳性能,分析了疲劳性能衰退影响因素。分析结果表明:裂纹开展过程中,全熔透焊缝试件相对于角焊缝试件,其应力幅衰退变化更显著。试件疲劳裂纹开展至距离焊趾处10mm时,试件的疲劳性能衰退得较快;超过10mm后,试件的疲劳性能衰退速率逐渐降低。该试验中,75%熔透率角焊缝试件的疲劳性能比全熔透焊缝试件的衰退得慢,75%熔透率角焊缝试件的疲劳性能比全熔透焊缝试件的好。
Six specimens of weld details between vertical stiffener and steel bridge deck were made.Constant amplitude fatigue test was conducted by considering melt penetration rate and loading stress range.The fatigue performance was studied by comparing the stress range variation rate.And the influencing factors of the fatigue performance of specimens were analyzed.The results show that stress range of weld melt-through specimens declines more obviously than that of fillet weld specimens as the crack propagating.The fatigue performance declines quickly before the crack reaching to 10 mm from the weld toe.After the crack exceeds 10 mm from the weld toe,the decline speed of the fatigue performance gradually decreases.In this test,the fatigue performance of fillet weld specimens with 75% penetration ratio declines slower than that of weld meltthrough specimens.Therefore,the fatigue performance of fillet weld specimens of 75%penetration ratio is better than that of weld melt-through specimens.
出处
《交通科学与工程》
2014年第3期24-29,共6页
Journal of Transport Science and Engineering
基金
国家自然科学基金资助(51278166)
江苏省交通科学研究计划项目(2013Y10-1)
泰州大桥技术开发项目(2013)
关键词
疲劳试验
钢桥面板
加劲肋
应力幅变化
熔透率
fatigue test
steel bridge deck
vertical stiffener
variation of stress range
penetration ratio
