Displacement Response Of Transmission Tower Line System In Wind Loads

As an important lifelines engineering, the destruction of transmission line tower system often causes large losses. Due to the high flexibility characteristics such as large span, the displacement response under wind load has the necessary economic value and significance. At present, the power transmission tower line system engineering tend to be large scale, complicated structure form, project indicators cost raise, for power of lifeline engineering design and theoretical research put forward new and higher requirements.Based on34m high drum (ZGU2) transmission tower line system as the research object and studied its dynamic characteristics, displacement response on downwind and crosswind. Got some calculation conclusion has reference significance of wind-resistant design of practical engineering calculation conclusion has reference significance.Firstly introduces the basic characteristic of the structure wind load and the calculation formula. Base on Mechanical characteristics on the system, and selects the appropriate unit types, established finite element model of transmission tower line system. Analysis of transmission tower line system of the first ten order natural frequencies and corresponding vibration mode through modal analysis.Then introduced structural random vibration theory and the basic formula of random wind vibration response, provide theory basis for the back of the wind vibration response analysis. According to the random vibration theory, the Davenport wind speed spectrum simulation effect of wind load on structures, and map the fluctuating wind load time history curve. Considering the spatial correlation of a fluctuating wind load, the power spectral density of a fluctuating wind load calculation, as a random excitation, the transmission tower wind direction wind vibration displacement response of each node.In addition to wind excitation, towering structure also are motivated by the crosswind direction. Based on the Qin Jiajun’s paper Dynamic Response of Transmission Tower Line System in Ice Loads and Wind Loads, at the same time analyzed the transmission line tower system each particle in the horizontal direction of the wind vibration displacement response. Compared with pleasant journey to the biggest displacement, both in the same order of magnitude for tall structures, so it is necessary to consider the transverse displacement response of the wind.By using Newmark-βnumerical methods, then determine the system analysis model in the along-wind and the across-wind analysis model. Analyze the mass matrix, stiffness matrix and damping matrix of transmission line tower system. Analyze wind-induced vibration of transmission tower line system in time domain. Then calculate the displacement curve of system, and compared the results with the results of ANSYS analysis.