Study On Wind Resistance Of 1000kV Tower Erecting Construction

Derrick and tower are towering structure,which is sensitive for the horizontal load caused by high soft features,according to huainan ~ Shanghai 1000 kV uhv transmission tower assembling construction,it uses a double rocker derrick group tower,and using the ANSYS software to the tower and derrick coupling system to study the wind resistance.There are two forms of wind load: one is the equivalent static method,namely the average wind load multiplied by wind vibration coefficient;The other is a numerical simulation method,that is,the average wind load plus the pulsating wind load.The ANSYS software is used to establish the three-dimensional model of the coupling system between the tower and the pole.The modal parameters of the structure are obtained by Block Lanczos method,and the natural frequencies and the natural vibration modes of the structure are obtained,Based on the modal analysis,the damping ratio of the first two frequencies and the damping ratio of the structure are obtained.Thus obtain the damping constant alpha and beta.According to the equivalent static method,the wind load of each node of the coupling system between the tower and the rod is obtained.ANSYS software is used to analyze the equivalent static force of the tower and the coupling system.It is concluded that the displacement and stress distribution,and the stress condition of the amplitude modulation rope,internal wire rope,waist ring and anchor rope etc under different working conditions.Thus,the maximum wind speed can be obtained under the condition of ensuring the safety of the tower and the coupling system to determine the scope of use.At the same time,the stress distribution law of the tower and the pole is also clear.These result provide the basis for the establishment of the tower erection scheme.This method of construction have a certain significance for the Assembling Tower Construction in the mountains and near the charged body where can not be set the wire rope in the outside of the tower.The Davenport spectrum is selected,and the wind speed time history curves are obtained by MATLAB software programming.According to the numerical simulation method,the wind load time history curve under 34m/s strong wind condition of the tower and the derrick coupled systems is calculated.Analysis of wind induced vibration response of the tower and pole coupling system by transient dynamic analysis of ANSYS software,we can obtain the displacement time history sample,velocity time history sample,acceleration time history sample and stress time history sample of the tower and pole coupling system in 34m/s wind speed conditions,to provide measures for typhoon weather occurred in the tower erection process.At the same time,according to the analysis results of the wind-induced vibration response of the tower and the coupling system,the wind vibration coefficient of each section of the tower and the pole is obtained.The numerical simulation results are compared with those of the wind vibration sample based on the code for design of building structures,thus analysising of the value of wind vibration coefficient of each section of the tower and pole coupling system.