Response Analysis Of High-voltage Transmission Tower Subjected To Wind And Rain Loads And The Research Of Wind Tunnel Test

High-voltage transmission towers react strongly with the wind load, and the rain load could not be ignored under the strong wind. However, the current theory now is still in the initial stage and the theory needs to be improved, and the design loads often do not contain the rain load.This paper takes the high-voltage transmission tower as a carrier, using the wind and rain load simulation measures to study the response, and making an aeroelastic modal of transmission tower for the experiment.(1) The first, we summarize the basic concept of wind load, and this paper describes harmonic superposition method which was used to simulate fluctuating wind load. Then, introducing the concept of precipitation, and an improved rain load formula is derived by force analysis.(2) First, it makes a brief introduction of the finite element method and SAP2000, then a high-voltage transmission tower model of SAP2000finite element model is established to make modal analysis and the natural frequencies and modes are derived. Finally, the wind and rain loads is simulated with the method of chapter2, and response analysis of high-voltage transmission tower subjected to wind and rain loads is performed.(3) Chapter4first introduces the dimensional analysis, similarity criterion and their respective advantages and disadvantages. Then design and make aeroelastic model of transmission tower. Finally, the calibration of dynamic characteristics is conducted and the frequency of aeroelastic model is obtained to verify model accuracy.(4) Chapter5describes the simulation method of wind and rain field, including wind field simulation and precipitation device. This chapter also calculates the similar ratio of wind and rain loads. At last the wind tunnel experiment is conducted and acceleration responses of tower tip under different conditions are obtained. The response tends to be big with the increase of rain intensity, and the increasing percentage is about8%-25%. Comparison of simulation and experiment shows that theoretical calculation is effective, and rain load is very important and cannot be ignored under some conditions at the same time.