SIMULATION STUDY OF STOCHASTIC FLUCTUATING WIND FIELD ON LARGE SPAN ELATRICITY TRANSMISSION TOWER-LINE SYSTEM

To perform a wind-induced response analysis for large span electricity transmission tower-line systems in time domain, considering various influences such as tower-line distribution, variation of mean velocity profile, power spectral energy and cross-spectral coherence in relation with structural style and power spectral characteristics of stochastic fluctuating wind field, a simplified scheme which can transform a multivariable 3D fluctuating wind field ( ) acting on large span transmission tower-line systems into a multivariable 1D stochastic wind field ( ) has been presented. Based on harmonic wave superimposing method and appropriate modified spectral decomposition, time marching generating method of fluctuating wind has been developed, which is suitable to analyze the wind-induced response of transmission tower-line system in combination with the finite element method. Finally, taking a real case as example, the time-marching curves were simulated. The results from statistical analysis of simulated data and comparison with target spectrum demonstrated the validity of the presented method and the applicability of simulated wind time-marching for wind-induced response analysis.