Research on ultimate bearing capacity state and structure optimization of main cable saddle

Abstract

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.