EXPERIMENT AND ANALYSIS OF VIBRATION CHARACTERISTICS OF YINGXIAN WOODEN TOWER

In order to provide the dynamic characteristics of Yingxian Wooden Tower for preservation and repair, on-site measurements were conducted. Frequency domain transfer function and the first four vibration modes of the tower in two mutually perpendicular horizontal directions are obtained. With the vibration shape orthogonality, the layer rigidity of the tower is deduced and the great rigidity difference of adjacent two floors is discovered. This indicates that the relative horizontal displacement under earthquake will concentrate on the less rigid layer. This observation is consistent with the current deformation state of the tower. Using transfer function technique, the elastic displacement response of each layer of the tower under different seismic waves is analyzed, and an elastic analysis method of the structure is established.