下击暴流环境下风、浪、流联合作用机制及跨海输电线路失效模式

跨海输电线路建设是发展海洋经济的重要一环。大量的事故和研究表明下击暴流对输电塔线安全运行有较大的危害性，而在近海发生的下击暴流致使的近地面强风，具有频发、高风速、致浪流的特点，风、风成流、风成浪等荷载效应之间的相关性明显，荷载作用机制更为复杂。跨海输电线路属于生命线工程，开展相关抗风、浪、流研究具有重要意义。. 申请项目采用理论分析、实验室物理模拟、数值仿真试验、现场实测等研究手段，围绕近海微地形下下击暴流风场特征，下击暴流环境下的风生浪、风生流、波生流的机制及相关理论，下击暴流和浪、流等荷载效应之间的时、频域相关性及联合作用机制，下击暴流环境下跨海输电线路的失效模式、设计理论等开展相关研究。阐明下击暴流环境下的风、浪、流联合作用机制和荷载效应理论，建立相应的跨海输电线路抗风、浪、流设计理论。相关研究成果还可推广应用于其他海上结构的荷载效应确定和抗风、浪、流设计中。

Offshore transmission lines play a critical role in the development of marine economics. A large number of accidents and studies have shown that downburst flows are harmful to the safe operation of transmission tower lines, while offshore downbursts cause strong winds near the ground, which occur frequently and have the characteristics of high wind speed and wave-induced flow. The correlation between wind, wind-induced flow, wind-induced wave are obvious, and the mechanism of load action is more complicated. The study on how to resist the wind, wave and flow loading is of great significance, since the transmission lines belong to lifeline engineering.. By means of theoretical analysis, laboratory physical simulation, numerical simulation test, field measurement, etc., the application project revolves around the characteristics of downburst wind field under offshore micro-topography, wind-driven wave and wind induced flow theory under downburst flow environment, as well as the time-frequency correlation between downburst flow, wave and current, and their combined action mechanism, also failure mode analysis and relevant design theory of offshore transmission line under downburst environment. The project aims to expound the combined action mechanism of wind, wave and fluid and their loading effects, and propose relevant wind-wave-flow resistance design theory. Relevant research results can also be extended to determine the load effect of other offshore structures and their wind-wave-flow resistance design.