The curved composite box girder with corrugated steel webs (CBG with CSWs) shows a more complex performance compared to a straight one due to the coupled flexural-torsional effect caused by its curvature. However, the relevant studies on it were limited. In this paper, considering the shear lag effect of the flanges, the shear deformation of the steel webs, and the coupled flexural-torsional effect, the natural frequencies of the curved CBGs with CSWs were derived using the energy variation method and Hamilton principle. Free vibration experiments were conducted on three simply-supported curved CBGs with CSWs. Numerical analysis was performed using ANSYS software. According to the parametric analysis, the torsional kinetic energy and the additional effect of the restrained torsion have little effect on the natural frequencies in the flexural-torsional vibration, while they significantly affect the flexural mode component. The natural frequencies decrease with the increase of λ (the ratio of calculation span to the radius of the curved axis). When λ ≤ 0.5, the reduction is smaller than 5%, but larger than 10% when λ > 0.7. The span presents an insignificant influence on the fundamental frequency if λ remains constant. Based on the analytical and experimental researches, a simple-to-use equation was proposed to calculate the fundamental frequency of the curved CBGs with CSWs.

由于曲率引起的弯曲-扭转耦合效应，带有波纹钢腹板的弯曲复合箱梁（带有 CSW 的 CBG）表现出比直箱梁更复杂的性能。然而，对其的相关研究是有限的。在本文中，考虑翼缘的剪力滞效应、钢腹板的剪切变形和弯扭耦合效应，使用能量变化方法和哈密顿原理推导出了具有 CSW 的弯曲 CBG 的固有频率。在三个带有 CSW 的简支弯曲 CBG 上进行了自由振动实验。使用ANSYS软件进行数值分析。根据参数分析，扭转动能和约束扭转的附加效应对弯曲扭转振动的固有频率影响不大，而对弯曲模态分量有显着影响。固有频率随着频率的增加而降低λ（计算跨度与曲线轴半径的比值）。当λ≤0.5时 ，减少量小于5%，当λ  >0.7时，减少量大于10% 。如果λ保持恒定，则跨度对基频的影响微不足道。基于分析和实验研究，提出了一个简单易用的公式来计算带有CSW的弯曲CBG的基频。