转体球铰偏心距计算及偏载作用下结构受力 分析

Calculation of Eccentricity of Swivel Spherical Hinge and Analysis of Structural Force Under Eccentric Load

【目的】当转体桥梁上部结构的重心不在球铰中心线上时,桥梁上部结构将产生偏心荷载,会对球铰受力产生不利影响。因此,有必要对偏载作用下的球铰结构受力进行分析。【方法】基于简化算法理论、弹性半平面体边界受集中力理论,对转体球铰的偏心距进行理论计算,并根据计算值来开展偏载状态下30000 t转体球铰的受力特性研究。在保证计算精度的前提下,将四氟滑片简化为四氟环条,能有效提高球铰有限元的建模效率。【结果】研究结果表明:球铰在正载和偏载作用下,球铰主要受力部件的强度和刚度均满足使用要求。当球铰处于偏载状态时,上球铰的应力增幅达18.4%。【结论】研究成果可为桥梁转体施工球铰设计及受力验算提供理论基础。

[Purposes]When the center of gravity of the superstructure of the swivel bridge is not on the center line of the spherical hinge,the superstructure of the bridge will produce eccentric load,which will adversely affect the force of the spherical hinge.Therefore,it is necessary to analyze the force of spherical hinge structure under eccentric load.[Methods]Based on the simplified algorithm theory and the theory of concentrated force on the boundary of the elastic half-plane,the eccentricity of the rotating spherical hinge was theoretically calculated,and the mechanical characteristics of the 30000 t rotating spherical hinge under eccentric load were studied according to the calculated values.On the premise of ensuring the calculation accuracy,simplifying the tetrafluoro vane into a tetrafluororing can effectively improve the modeling efficiency of the spherical hinge finite element.[Findings]The results show that the strength and stiffness of the main force components of the spherical hinge meet the requirements under the action of positive load and partial load.When the ball joint is in the eccentric load state,the stress of the upper ball joint increases by 18.4%.[Conclusions]The research results can provide a theoretical basis for the design and force checking of the spherical hinge in bridge rotation construction.