Effects of center-hung scoreboard on seismic responses of suspendome structure

In order to investigate the effect of the center-hung scoreboard on the seismic response of the suspendome structure, a two-degree-of-freedom (2-DOF) series dynamic model was established based on the primary-secondary coupled effect. The dynamic response of the coupled system was then derived using the transfer function method. Subsequently, the MATLAB software was used to conduct a comprehensive investigation into the impact of various parameters, including the center-hung scoreboard, its lifting, and the site soil characteristic frequency, on the vertical and horizontal seismic responses of the suspendome structure. By comparing with the test results, the impact of different parameters on the dynamic response of the suspendome structure was obtained. Finally, the parametric analysis of the mass ratio and frequency ratio was carried out by using the verified stochastic seismic model of the primary-secondary coupled system. The characteristics and laws of the dynamic interaction between the center-hung scoreboard and the suspendome structure were found and summarized: the center-hung scoreboard increases the vertical seismic response of the primary structure. The center-hung scoreboard exerts a comparatively minor impact on the horizontal seismic response of the primary structure. The center-hung scoreboard lifting has little effect on the seismic response of the superstructure. From the perspective of acceleration and displacement, in order to realize the desired interactive damping of the center-hung scoreboard and suspendome structure, the frequency ratio β ≥ 4 should be guaranteed.