首页|正交异性钢桥面顶板U肋全熔透焊接接头研发及疲劳性能研究

正交异性钢桥面顶板U肋全熔透焊接接头研发及疲劳性能研究

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正交异性钢桥面顶板U肋传统焊接接头疲劳开裂问题突出,严重影响钢制桥梁工程的全寿命周期质量,因此钢结构桥梁亟需发展具有高疲劳强度及抗裂性好的顶板U肋焊接接头.本文基于先进的内焊技术和顶板U肋焊接接头制造工艺,研发了顶板U肋全熔透高品质焊接接头,通过初始裂纹尺寸检查和疲劳寿命评估对比了不同制造工艺对新提出接头抗疲劳性能的影响,在此基础上确定了合理焊接工艺,最后通过疲劳试验验证了该新型构件的疲劳性能.研究结果表明,新研发的顶板U肋全熔透高品质焊接接头具有"无缺陷、可检测"的突出优点;全熔透焊接时,埋弧焊显著优于气体保护焊,前者仅引起存在于顶板焊趾处的初始裂纹,且尺寸明显小于后者;初始微裂纹尺度对顶板U肋全熔透焊接接头的疲劳寿命具有显著影响,初始微裂纹为 0.05mm的疲劳寿命是初始微裂纹为0.3mm的疲劳寿命的2 倍,推荐采用双面埋弧焊作为全熔透高品质焊接接头的制造工艺;疲劳性能试验结果表明,本文新研发焊接接头的疲劳性能均显著优于单面焊、部分熔透双面焊(气体保护焊)和全熔透(气体保护焊)焊接接头的疲劳性能.
Study on Development and Fatigue Performance of the U-shaped Rib-to-Deck Full-Penetration Welded Joint in Orthotropic Steel Deck
Fatigue cracks in rib-to-desk welded joints of orthotropic steel bridge desks(OSD)are observed commonly,which seriously affect the service quality of bridge engineering.There is an urgent need to develop rib-to-deck welded joint with high fatigue strength.Based on advanced internal welding technology and the manufacturing technique for rib-to-deck welded joint,a high-quality welded joint with full-penetration was developed.The effects of different manufacturing conditions on the fatigue performance of the high-quality welded joint were clarified by initial manufacturing defect scale detection and fatigue life estimation,and further verified by fatigue test.The results showed that the developed high-quality welded joint have the outstanding advantages of being"defect-free and detectable".In full-penetration welding,the double-sided submerged arc welding was significantly superior to gas shielded welding,with the former only causing initial cracks at the weld toe of the deck panel,and the size of these cracks was significantly smaller than those caused by the latter.The initial micro-crack size significantly affected the fatigue life of rib-to-deck welded joints.The fatigue lifespan for initial micro-cracks of 0.05mm was twice that of a initial micro-cracks of 0.3mm.The double-sided submerged arc welding is recommended to be used as the manufacturing process of full-penetration high-quality welded joint.Fatigue test results showed that the fatigue performance of rib-to-deck full-penetration high-quality welded joint was significantly better than that of the one-side welding,partial penetration welding of both-side gas shielded welding and full-penetration gas shielded welding.

bridge engineeringorthotropic steel bridge deckfull-penetration high-quality welded jointfatigue failure modesfatigue strength

彭振楠、宋神友、陈焕勇

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深中通道管理中心,广东 中山 528449

桥梁工程 正交异性钢桥面板 全熔透高品质焊接接头 模型试验 疲劳强度

2024

广东公路交通
广东省交通科技有限公司

广东公路交通

影响因子:0.311
ISSN:1671-7619
年,卷(期):2024.50(6)