Experimental study of wind force on latticed tower

A model of latticed tower(LT) was tested in TJ-1 wind tunnel in Tongji University using high-frequency-force-balance technique to investigate the characteristics of wind forces acting on the tower. The results indicate that the mean force coefficients have no practical variability with turbulence. Along-wind wind force is the major load on the LT for the static wind effects, and along-wind fluctuating forces are larger than across-wind fluctuating forces, but the fluctuating torsional force can be ignored. Some exiting codes and standards about mean drag coefficients were compared. Based on the analysis of power spectrum densities (PSDs) of the forces, some conclusions are drawn that incoming wind turbulence has great contribution to along-wind forces, and PSD of across-wind forces is more complicated, multiple excitations may exist. In addition, the torsional PSD is a broadband frequency spectrum, and its value is smaller than PSD values of along-wind and across-wind force. With the increase of turbulence, the torsional PSD value does not change remarkably. Furthermore, the coherence between across-wind forces and torsional moment is strong, and turbulence intensity has little influence on coherence.