Research on shape coefficients of lattice transmission systems based on the ambient test

The research on shape coefficient is the central issue of the wind study and the criterion constitution. In this paper, an 800kV ultra high voltage transmission line was studied. The ambient excitation testing and the time-domain method were used to study the shape coefficient of the transmission tower. The wind speed on the top of the tower was measured by the anemometer DT-80, while the acceleration values of the structure and the ground vibration were measured by the acceleration sensors simultaneously. SVSA was used to collect the acceleration values. The shape coefficients were derived from the Chinese code and the CFD simulation. The response was calculated by the time-history method. It was conclude that the along-wind root mean-square (RMS) value from the code coefficient had a large discrepant with the test results. The results from the CFD were very approached to that obtained by the test. The deviation was controlled in 10%. However, it couldn´t estimate that the coefficient from the code was not suitable to the design for the limit of the test condition. Hence, the further study should be made for a clear understand of the shape coefficient.