基于非赫兹接触理论下的转体施工过程抗倾覆分析

Overturning Moment Analysis of Rotating Construction Process Based on Non-Hertz Contact Theory

以往转体桥球铰受力分析均基于《公路桥涵施工技术规范》,即简化为平面来进行协调接触应力计算,其转体过程中转动系统的抗倾覆能力由球铰的竖向摩阻力矩提供。文中基于非赫兹接触理论进行球铰接触应力的计算,进而推导球铰的抗倾覆力矩,并通过与实际测量结果与计算倾覆力矩的比较,得出相对于《公路桥涵施工技术规范》的简化算法,基于非赫兹接触理论下转体施工的桥梁抗倾覆能力算法的优越性,结果显示该算法的精度较基于简化算法的计算精度更高。

In the past,the rotating bridge spherical joints were simplified to plane model to perform coordinated contact stress calculation based on the technical specifications of highway bridges and culverts.The overturning resistance of the rotating system during the turning process is provided by the vertical frictional torque of the spherical joint.The Hertz contact theory is used to calculate the contact stress of the spherical joint,and then the overturning moment of the spherical joint is derived.By comparing with the actual measurement results and the calculated overturning moment,a simplified algorithm based on the technical specifications of the highway bridge and culvert is obtained.The superiority of the overcapacity algorithm of the bridge under the theory of Hertz contact is shown.The results show that the algorithm is more accurate than the simplified algorithm.