强风作用下输电线-塔传递动力荷载分析

An approximate separation method for the transmission line subsystem is established， which considers the line-tower coupling and employs an objective optimization method to determine the elastic support constraint stiffness of the isolated transmiision line subsystem under wind_induced vibration. Taking a typical transmiision line-tower system with the wind direction perpendicular to the line as the case study，the fluctuating wind field was simulated and the structural wind_induced vibration response was calculated. A systematic analysis of the transferred dynamic load characteristics was conducted， which was compared with those obtained under the traditional fixed support boundary conditions. It indicates that the vibration of the transmiision tower along the line direction has a mitigating effect on transmitting loads，but tends to weaken as the wind speed increases. The intensity would be overestimated when using the traditional fixed support boundary constraints，and the loads exhibits significant fluctuating effects both along and across the line direction. Current Chinese design codes for transmission lines，which consider only the perpendicular component while neglecting the parallel one，may therefore entail a risk of insufficient safety margin in assessing strong wind loads.