To confirm the improvement of the double-side weld on the fatigue performance of the U rib-to-deck welded joint in the orthotropic steel bridge deck in comparison to that of the sin-gle-side weld,the segment of the orthotropic steel deck of a practical bridge was taken as an object and the software ANSYS was used to set up the finite element model for the segment.The notch stress ranges of the fatigue vulnerable parts of the double-side and single-side welds under the dif-ferent load conditions were calculated and the factors that had influences on the fatigue perform-ance of the U rib-to-deck double-side welded joint were analyzed.The results of the analysis dem-onstrate that the maximum notch stress range of the double-side welded joint is reduced by 1 9.1%in comparison to that of the single-side welded joint and the reduction of the stress range can effec-tively improve the fatigue performance of the U rib-to-deck welded joint.The worst fatigue vulner-able part of the single-side weld is the weld root while that of the double-side weld is the outer side weld toe.The influences of the incomplete penetration gap length and height of the weld on the fa-tigue performance of the double-side welded joint are slight.The increase of the included angle be-tween the weld and deck can significantly decrease the maximum notch stress range of the double-side welded joint and can improve the fatigue performance of the joint.%为确定钢桥面板U肋与顶板双面焊连接相比单面焊连接疲劳性能的改善效果,以某实桥正交异性钢桥面板节段为对象,采用ANSYS软件建立有限元模型,计算不同工况下各疲劳易损部位的切口应力幅,并分析双面焊连接疲劳性能的影响因素.结果表明:U肋与顶板双面焊连接的最大切口应力幅比单面焊时减小19.1%,能有效提高 U肋与顶板连接焊缝的疲劳性能;U肋与顶板单面焊连接的最不利疲劳易损部位为焊根,而双面焊连接的最不利疲劳易损部位变为外侧焊趾;焊缝未熔透间隙长度和高度对 U肋与顶板双面焊连接疲劳性能的影响较小;增大焊缝和顶板夹角可显著降低双面焊连接的最大切口应力幅,提高U肋与顶板双面焊连接的疲劳性能.
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