高速铁路沿线列车通过高压输电塔振动特性实测OA

The sections where high-speed railways and high-voltage power transmission lines cross and overlap(referred to as"three crossings")are increasing.The vibrations caused by train operation pose a potential threat to the structural safety of adjacent power transmission towers.However,current research lacks long-term on-site measured data that is synchronized and systematic for typical crossing sections of towers and line systems.The study takes 110 kV Yuyan I transmission tower in the intersection area of Guangzhou-Shenzhen-Hong Kong and Beijing-Hong Kong high-speed railways as the research object,and systematically investigates the vibration characteristics of high-voltage transmission towers along high-speed rail lines during train passage based on field measurement data.High-precision and zero-frequency accelerometers are deployed to collect vibration acceleration data from three towers(N10,N11,N12)under different train conditions(no train,single train and alternating dual-train),different routes(Line A,Line B,simultaneous operation on both lines),and at different speeds(250,350,380 km/h).Time domain and frequency domain analysis are carried out with acceleration vibration severity for comparative verification.The results reveals that train operation significantly excites vibration responses.The peak acceleration increases with train operational complexity and speed.Under alternating dual-train operation,the vibration energy increases by up to 132.34%compared to the no-train condition.The dominant vibration frequencies are clustered around 4 Hz,8 Hz and 12 Hz,primarily governed by the structural natural frequencies.Spatially,tower N11,closest to the track,exhibits the strongest response.In contrast,the structurally dissimilar tower N12 shows resonant amplification in specific directions(such as north-south)due to matched dynamic characteristics.Line comparisons reveal more pronounced excitation effects on Line B,while simultaneous operation on both lines may suppress some responses due to vibration interference.This study elucidates the mechanism of train-induced vibrations on the dynamic behavior of transmission towers,providing a theoretical basis and data support for the vibration-resistant design,safety assessment,and damping control of towers in"three crossings"sections.