Analysis of Dynamic Characteristics of±800 kV UHV Transmission Tower
In the study of the structural design and dynamic characteristics of transmission tower structures,the accurate determination of the tower's dynamic response through theoretical analysis and numerical simulation poses a significant challenge.This paper focuses on the±800 kV Ultra-High Voltage Direct Current(UHVDC)transmission line towers and establishes a finite element model of the tower-line-foundation system.The p-y curve method is employed to represent the discrete nonlinear springs simulating soil-structure interaction.Different computational models,including single-tower,three-tower two-line,and the tower-line-foundation system,are compared and analyzed concerning the dynamic characteristics of UHV transmission towers.The study investigates the effects of the mass and stiffness of the transmission line on the tower's dynamic behavior,emphasizing the importance of considering tower-line coupling.The inclusion of pile-soil interaction results in a reduction in the natural frequency of the transmission tower.The tower-line-foundation system model yields frequencies that are relatively smaller compared to the single-tower model,and they are closer to the frequencies observed in field tests,validating the rationality of the tower-line-foundation system model.
transmission towertower-line-foundation systemdynamic characteristicsp-y curvecalculation model
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