Influence of Center-Hung Scoreboard on Seismic Response of Single-Layer Spherical Reticulated Shell Under One-dimensional Horizontal Earthquake

The center-hung scoreboard is large-scale display device flexibly suspended in the center of the gymnasium. The influence of center-hung scoreboard on seismic response of single-layer spherical reticulated shell is not clear. In this paper, the FEA models of coupling systems composed of single-layer spherical reticulated shell and center- hung scoreboard are established. The seismic responses of coupling systems are calculated by explicit dynamic time history method. The seismic responses of the coupling systems are compared between the flexibly suspended case and the simplified case where the scoreboard is simplified as fixed mass of the support platform. The effects of the sling length and the scoreboard weight on seismic responses of the coupling systems are also discussed. Compared with the simplified case, peak values of displacements, accelerations and axial force are significantly different when the scoreboard is flexibly suspended. The treatment method of simplifying the scoreboard as fixed mass of the support platform is dangerous. The sling length and the scoreboard weight have significant effects on peak values of displacements, accelerations and axial forces of the coupling systems. The envelope values under different sling lengths and different weight should be taken as seismic response results for structural design.