Abstract
Double-layer cylindrical latticed shells are widely used into a sports hall and convention hall, etc as a roof structure. The structural characteristics of them have been investigated theoretically and experimentally to grasp the buckling strength or dynamic behavior for seismic design. However, the free vibration behavior, in particular, the relation of damping ratios and frequencies has not been sufficiently investigated, yet. Then, in this paper, model experiments were carried out in order to make clear the free vibration behavior, that is, natural frequencies, damping ratios and the relations among them. It was consequently made clear that the damping ratios were inversely proportional to the natural frequencies for the latticed structures.
