Study on Stability of Transmission Tower-Line System under a Downburst

A downburst is one of the high-intensity winds that cause transmission tower failures. In recent years, downbursts have brought great disasters to economies and lives people all around world. this paper, dynamic stability tower-line system under a analyzed. The deterministic-random mixed model used generate wind field ANSYS software employed establish finite element system. response characteristics in atmospheric boundary layer (ABL) fields are compared through time history analysis. displacement analyzed with different Zmax values attack angles. Based on Budiansky–Roth criterion incremental method, action studied, corresponding speed conditions when unstable obtained. results show top 1.83 times ABL wind. acceleration 1.57 most unfavorable angle for 90°. When within height range tower, influence increases increase Zmax. exceeds decreases. Under angle, conductor obvious.