Low-velocity impact behavior of SWRH82B steel wires considering different section shapes based on experiments and simulations

SWRH82B steel wires are commonly used in suspended-cable structures, large-span structures, and cable-stayed bridges owing to their light weight, strong bearing capacity, and safe and reliable operation. In this study, the dynamic mechanical performance of SWRH82B steel wires under low-velocity impact was studied experimentally and numerically. A drop-hammer impact test system was adopted for the impact experiments, considering the influence of the specimen diameter, specimen span, indenter shape, and impact position. Two-section steel wires, including circular and Z-shaped wires, were investigated. The experimental results indicated that local denting deformation occurred at the impact position with a lower impact energy, and wire breakage occurred near the position of the clamping device with a larger impact energy. Circular wires were stronger and stiffer than Z-shaped wires of the same diameter because they can provide a higher impact resistance and stronger energy absorption capacity with a regular section shape. The experimental data indicated that the specimen diameter positively affects the impact bearing capacity, providing more flexural rigidity. However, the specimen span negatively influences the dynamic performance of both types of steel wires; a greater increase in peak load was observed when using a cylinder hammer. In addition, a finite element model was established to further analyze the failure modes and discuss a larger range of parameters. Finally, a numerical model of prestressed steel wires was developed using ABAQUS/EXPLICIT, with the results indicating that the prestress force could strengthen the impact resistance of steel wires at a lower level.