运用有限元计算了钢箱梁桥面板单轴载荷下的应力分布，测量了已服役桥面板的腐蚀减薄量，对其开展了拉伸性能与疲劳性能测试，研究了腐蚀程度对钢箱梁服役性能的影响。结果表明：重车单轴载荷（13 t）作用下，桥面板的最大应力出现在U肋顶部，最大横向拉应力与最大压应力分别为111.6 MPa和118 MPa；不同腐蚀程度桥面板试样的当量抗拉强度随剩余厚度减薄呈近似线性降低；在当量应力幅值115 MPa条件下，桥面板试样的疲劳寿命随剩余厚度减少大幅降低，为保证桥梁的安全性，桥面板剩余厚度应不低于10 mm。

The stress distribution of steel box girder deck under uniaxial load was calculated by finite element method, the corrosion thinning of the in-service bridge deck was measured, the tensile properties and fatigue properties were tested, and the effect of corrosion degree on the service performance of steel box girder was studied. The results showed that the maximum stress of the bridge deck appeared at the top of the U-rib under the uniaxial load (13 t) of a heavy vehicle, and the maximum transverse tensile stress and maximum compressive stress were 111.6 MPa and 118 MPa, respectively. The equivalent tensile strength of the bridge deck specimens with different corrosion degrees decreased approximately linearly with the reduction of the remaining thickness. Under the condition of equivalent stress amplitude of 115 MPa, the fatigue life of the bridge slab specimen was greatly reduced as the remaining thickness decreased. To ensure the safety of the bridge, the remaining thickness of the bridge slab should not be less than 10 mm.