Abstract
During the vibration of a transmission tower, the joints will be subjected to a reciprocating load. To obtain the accurate state of the transmission tower under the load, the mechanical properties of the joints under the vibration load must be considered. In this paper, the mechanical properties of typical K-joints in transmission tower structures are studied by numerical simulation. The failure mode of the K-joint under cyclic loading is also analyzed. The mechanical properties of the K-joint are discussed from the aspects of hysteretic characteristics, stiffness degradation, energy dissipation capacity, and ductility evaluation, and the influencing factors are discussed. The results show that the failure mode of the K-joint is related to the bolt grade and steel strength. When analyzing K-joints, the moment-rotation hysteresis curve should be combined with the realistic parameters of joints to consider the hysteretic behavior of the K-joint. The results provide a theoretical reference for the accurate modeling of transmission towers.
Highlights
Joints are the connecting parts between structural components. e mechanical characteristics of joints have a significant impact on the entire structure
Faridmehr et al [6] carried out cyclic loading tests on rigid and semirigid steel beam-column connections. e results show that the rigid connection has a greater energy dissipation capacity and equivalent hysteretic damping ratio under a larger interstory drift angle
Li et al [23] analyzed the hysteretic performance of transmission tower typical bolt joints under cyclic loading and studied the effects of bolt slip on the hysteresis performance joints. e results showed that the hysteretic effect of bolt slip should be considered when calculating the dynamic response of the transmission tower
Summary
Joints are the connecting parts between structural components. e mechanical characteristics of joints have a significant impact on the entire structure. E results show that the rigid connection has a greater energy dissipation capacity and equivalent hysteretic damping ratio under a larger interstory drift angle Lattice structures such as towers and grids are composed of structural steel, steel pipes, or composite section bars, and semirigid joints are completely different from beam-column joints. Li et al [23] analyzed the hysteretic performance of transmission tower typical bolt joints under cyclic loading and studied the effects of bolt slip on the hysteresis performance joints. Ma et al [24] proposed a hysteretic model of singlebolted angle joints considering cyclic bolt slip, which can more effectively study the joint behavior of towers.
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