In order to make the main cable saddle structure lighter and reduce the cost, it is necessary to conduct in-depth research on the force transmission path, failure mode and ultimate bearing capacity of the main cable saddle. A parametric geometric model was established based on Autodesk Inventor software and imported into the large-scale general-purpose finite element software ABAQUS for numerical simulation research under ideal elastoplastic state, and the mechanical properties and ultimate bearing capacity of the main saddle were systematically studied. A structural optimization method with safety factor as the goal was proposed, and the original design was optimized for structural size. Then, the ultimate bearing capacity state of the cable saddle considering the influence of the steel's post-buckling strength is analyzed, and the structural bearing capacity evaluation index is proposed. The analysis results show that the ultimate bearing capacity of the preliminary design cable saddle is 3.00 times the design load, and it has sufficient safety reserves; the ultimate failure state of the cable saddle is the formation of a plastic hinge at the junction of the transverse rib, saddle channel cast steel and the web; By quantitatively analyzing the development of the plastic zone of each component of the cable saddle, the force transmission path and failure process of the structure can be analyzed more clearly, which provides a basis for the structural optimization of the cable saddle; and obtain the steel consumption under different safety factor target values (2.5, 2.0, 1.85, 1.5, 1.25), for example, when the safety factor target is 1.85, 38.8% of steel can be saved; when considering deformation index control, it is recommended that the target safety factor of the ideal elastoplastic analysis control is not less than 1.82.

为了使主电缆鞍座结构更轻，降低成本，有必要对主电缆鞍座的传力路径，破坏方式和极限承载力进行深入研究。基于Autodesk Inventor软件建立了参数化几何模型，并将其导入大型通用有限元软件ABAQUS中，以进行理想弹塑性状态下的数值模拟研究，并系统地研究了主鞍座的力学性能和极限承载力。提出了一种以安全系数为目标的结构优化方法，并对结构的原始设计进行了优化。然后，分析了考虑钢的后屈曲强度影响的电缆鞍座的极限承载力状态，提出了结构承载力评价指标。分析结果表明，初步设计的电缆鞍座的极限承载力是设计载荷的3.0倍，并具有足够的安全储备；电缆鞍座的最终失效状态是在横向肋，鞍座槽铸钢和腹板的连接处形成一个塑料铰链。通过定量分析电缆鞍座各部件塑性区的发展，可以更清晰地分析结构的传力路径和破坏过程，为电缆鞍座的结构优化提供依据。并获得不同安全系数目标值（2.5、2.0、1.85、1.5、1.25）下的钢材消耗量，例如，当安全系数目标为1.85时，可以节省38.8％的钢材；