Numerical Simulation on Wind Induced Responses of Steel Guyed Transmission Tower Line Coupling Systems
Compared with self supporting tower, guyed tower has advantages of low steel consumption, constructability and excellent wind resistant performance, so it has been widely applied in transmission lines. The suspended guys stabilize towers, which have higher flexibility and geometric nonlinearity bringing great difficulties in numerical simulation. Researches on dynamic characteristics of guyed tower is relatively limited, especially when subjected to wind induced response. A finite element model of guyed towers is built. In the numerical simulation of wind loading, fluctuating wind speed timehistory is assumed to be a stationary Gaussian random process and Davenport spectra is adopted as wind speed spectra. Auto regressive method is applied to compute the random wind dynamic loads as the input waves. Results of the time history analysis show that torsional deformation of the structure is easy to appear under wind load. The conductor and ground wire have a weakening effect for the wind induced vibration response of guyed towers. Calculation methods of the wind induced vibration coefficient in design codes across the country are compared. Finally, a distribution of wind vibration coefficient is recommended for the practical design of guyed towers.