In orthotropic steel decks (OSDs), the rib-to-crossbeam joint is the most vulnerable detail that has not been drawn enough attention. The failure mode of cracks initiate from the lower weld end on rib wall is governing its fatigue performance. However, relevant detail categories are still missing in prevailing codes. This paper mainly focuses on the stress concentrations at the rib-to-crossbeam joint induced by rib distortions. A series of static load tests were first performed on a full-scale OSD specimen with different weld length between the ribs and the crossbeam. Then, corresponding numerical simulations were finished. Several possibilities that may cause the differences between the measurements and the calculations are investigated. At last, fatigue assessments based on influence lines of structural hot spot stress (SHSS) are completed. Research results reveal that the measurement results of reference points for SHSS method would be very sensitive to the exact location of strain gauges. Due to the manual welding, the deviation of strain gauge positions induced by the irregular weld shape is thought to be the main reason that causes the differences between measurements and calculations. Raising the location of cope hole terminations would decrease distortional stresses. However, the influence of this parameter on fatigue lives is rather small. The fatigue lives of points along the lower weld toe are very close. Hence, the point at the middle plane of crossbeam could be used as the reference point for fatigue assessments. Meanwhile, the center between ribs could be used as the reference transverse load position for fatigue assessments of this joint.

在正交异性钢甲板（OSD）中，肋骨至横梁接头是最易受伤害的细节，尚未引起足够的重视。从肋壁下部焊接端开始的裂纹失效模式决定着其疲劳性能。但是，现行代码中仍缺少相关的详细类别。本文主要关注肋骨变形引起的肋骨至横梁连接处的应力集中。首先在肋骨和横梁之间具有不同焊接长度的全尺寸OSD标本上进行了一系列静载荷测试。然后，完成了相应的数值模拟。研究了可能导致测量值与计算值之间差异的几种可能性。最后，完成了基于结构热点应力（SHSS）影响线的疲劳评估。研究结果表明，SHSS方法参考点的测量结果对应变仪的精确位置非常敏感。由于手工焊接，不规则焊接形状引起的应变仪位置偏差被认为是造成测量和计算之间差异的主要原因。提高上孔末端的位置将减少变形应力。但是，该参数对疲劳寿命的影响很小。下焊趾沿点的疲劳寿命非常接近。因此，横梁中间平面上的点可以用作疲劳评估的参考点。同时，肋骨之间的中心可以用作该关节疲劳评估的参考横向载荷位置。