Study on dynamic response analysis and vibration control of TV tower under wind-rain load excitation

This study thoroughly examines the impact of the coupling effects of wind-rain load on the structural behavior of the television tower, and the effective vibration control method is employed to mitigate the dynamic response of the structure. A refined finite element model of the tower was developed, and the dynamic response characteristics of the structure under varying wind speeds and rain intensities are further investigated. Based on parameter analysis, the influence of mass ratio and frequency ratio on the damping efficiency of tuned mass damper (TMD) was revealed. The results demonstrate that compared to wind load alone, the node displacement increases more significantly near the top of the tower under wind-rain load. When the basic wind speed reaches 40 m/s, the TV tower will be damaged due to the extreme compressive stress of the 45 units on the compression side exceeding the yield strength of the members. Under extreme weather loads, the members on the compressive side at a height of 60 meters are most susceptible to yielding and entering the plastic deformation stage. The overall vibration reduction effectiveness of TMD increases with higher mass ratios, with a mass ratio of 1.5 % identified as optimal. Regarding the reduction of top displacement of the tower, the effectiveness of TMD varies with frequency ratio, showing an initial increase followed by a decrease; optimal vibration control is observed at a frequency ratio of 0.9.