The present study aims to address the instability mode of the concrete spherical joint in order to guarantee the safety of the rotating process of the swing bridge. A new critical overturning moment model is proposed to calculate the overturning moment of swing bridge based on the non-Hertz contact theory, and it is validated against the engineering application of the Nandu River Swing Bridge construction. The research indicates that the Non-Hertz contact theory has superiority compared to the widely applied simplified formulation on the spherical joint surface stress calculation, by contrasting the results of the finite element model and the data collected during field monitoring. Furthermore, the resistance of the overturning coefficient is calculated, and the result turns out that the critical resistance of the overturning coefficient based on the Non-Hertz contact theory is closer to the measured values compared to the simplified algorithm. The present research demonstrates the applicability of applying the new proposed formula to guarantee the safety of the rotating process during the swing bridge construction.

本研究旨在解决混凝土球形节理的失稳模式，以确保回转桥旋转过程的安全性。基于非赫兹接触理论，提出了一种新的临界倾覆力矩模型，用于计算摆臂的倾覆力矩，并针对南渡河摆桥的工程应用进行了验证。研究表明，通过比较有限元模型的结果和现场监测过程中收集的数据，与在球形接头表面应力计算中广泛应用的简化公式相比，非赫兹接触理论具有优势。此外，计算倾覆系数的电阻，结果表明，与简化算法相比，基于非赫兹接触理论的倾覆系数的临界电阻更接近测量值。本研究证明了使用新提出的公式来确保回转桥施工中旋转过程的安全性的适用性。