Research On Wind Resistance Performance Of 1000kV UHV Substation Tower

Electric power resources are one of the strategic energy resources in our country,which involve all aspects of people’s life and economic development.Substation tower is an important structure in the transmission line hub.It holds the characteristics of high flexibility,low damping and wind sensitivity.Therefore,it is necessary in order to study the wind resistance of substation tower.Based on the research background of a 1000 kV substation towers,the whole and segment models of the structure are made.The wind tunnel test with abnormal frequency balance is used to compare and analyze the variation of the wind coefficients of the model under type A landform,type B landform and uniform flow field.At the same time,it introduces the wind load calculation formula and shape coefficient related clauses of wind load code in domestic and foreign countries,and the results are compared and analyzed with the measured,body coefficients of the wind tunnel.The results demonstrate that the model is turbulent.The variation of flow field has little effect on the average base shear coefficient of the model;the fluctuating shear coefficient of the tower is larger,and the influence of fluctuating wind load can’t be ignored;the most unfavorable wind direction angle of the measured tower is 0 and 90 and the shape factor is related to the windshield area and the magnitude of cross-wind wind load;the vibration of the tower caused by cross-wind load leads to a larger lift coefficient,which can’t be ignored.The variation trend of frame shape coefficient with wind direction angle is inconsistent with the normal values of other countries,and the maximum measured shape coefficient is larger than the normal value.Wind tunnel test should be utilized to analyze the wind load distribution of structures in practical projects.