新型镦边U肋与面板连接焊缝切口应力分析

发布时间：2018-10-19 20:41

【摘要】：正交异性钢桥面板焊接部位疲劳问题突出,为研究采用新型镦边U肋替代传统U肋,其与正交异性钢桥面板焊缝处的应力改善情况,以典型正交异性钢桥面板为研究对象,按照实际尺寸参数采用ANSYS有限元软件建立足尺节段模型进行分析。确定关注区域及最不利荷载加载位置,在此基础上,建立焊缝局部精细模型,采用切口应力法分析镦边U肋与面板焊缝和传统U肋与面板焊缝在焊趾及焊根部位的应力。结果表明:采用镦边U肋与传统U肋在U肋与面板焊缝处应力分布基本相似;相对于传统U肋焊缝,镦边U肋焊缝在面板焊趾、焊根和U肋焊趾处应力最大降幅分别为24.3%、43.8%、60.5%,镦边U肋可以较好地改善U肋与面板焊缝处的应力集中效应,有利于提高结构的抗疲劳性能。
[Abstract]:The fatigue problem of orthotropic steel bridge panel welding is very serious. In order to study the stress improvement between orthotropic steel bridge and orthotropic steel bridge, a new upsetting U-rib is used to replace the traditional U-rib. The typical orthotropic steel bridge panel is taken as the research object. According to the actual dimension parameters, ANSYS finite element software was used to establish the full-scale segment model for analysis. On the basis of the determination of the region of concern and the position of the most unfavorable load loading, the local fine model of weld seam is established, and the stress of upsetting U-rib and panel weld and traditional U-rib and slab weld in the weld toe and root are analyzed by notch stress method. The results show that the stress distribution between upsetting U rib and traditional U rib is basically similar to that of traditional U rib weld, compared with the traditional U rib weld, the upsetting U rib weld is at the toe of the panel welding. The maximum decrease of stress at the weld toe of the welded root and the U-rib is 24.33or 43.80.The upsetting U-rib can improve the stress concentration effect between the U-rib and the welding seam of the face slab and improve the fatigue resistance of the structure.
【作者单位】：西南交通大学土木工程学院;中铁大桥勘测设计院集团有限公司;
【基金】：国家自然科学基金项目(51578455)~~
【分类号】：U441.5

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