# Shaking Table Tests of Suspended Structures Equipped with Viscous Dampers
## 5 Conclusions  
Through the shaking table tests and comparative analysis of the damping suspended structure and the conventional suspended structure, the following conclusions can be obtained:  
Compared with the conventional suspended structure, the damping suspended structure, which uses viscous dampers to connect the suspended floors with the primary structure, had a reduced  
Figure 11: Maximum displacement of a suspended floor relative to the primary structure. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \multirow{2}{*}{**Seismic Input**} & \multirow{2}{*}{**Position**} & \multicolumn{3}{c}{**Steel Wire**} & \multicolumn{3}{c}{**Concrete**} \\ \cline{3-8}  & & **CSS** & **DSS** & **reduction** & **CSS** & **DSS** & **reduction** \\ \hline \multirow{4}{*}{**El Centro**} & BC & 136 & 90 & 33.8\% & 154 & 70 & 54.5\% \\  & EB & 211 & 75 & 64.5\% & 192 & 68 & 64.6\% \\  & MB & 110 & 47 & 57.3\% & 60 & 31 & 48.3\% \\  & BC & 138 & 93 & 32.6\% & 161 & 78 & 51.6\% \\ Taft & EB & 257 & 87 & 66.1\% & 194 & 53 & 72.7\% \\  & MB & 102 & 43 & 57.8\% & 52 & 30 & 42.3\% \\  & BC & 141 & 101 & 28.4\% & 166 & 87 & 47.6\% \\ artificial wave & EB & 240 & 98 & 59.2\% & 176 & 95 & 46.0\% \\  & MB & 97 & 42 & 56.7\% & 49 & 26 & 46.9\% \\ \hline \end{tabular} Note: “BC” indicates the bottom of the column, “EB” indicates the ends of the top suspended beam and “MB” indicates the mid-span of the top suspended beam.  
\end{table} 
Table 8: Maximum strain response of key parts (\(\mu\epsilon\)). natural vibration frequency, and the damping ratio of the damping structure was improved, especially the first frequency and the corresponding damping ratio. The acceleration amplification factor of the two test models did not change much with the increase of seismic intensity, but increased obviously with the structural height, and the maximum acceleration amplification factor was mainly in the range of 1.6 to 2.0. The acceleration peak response at the top of the primary structure of the damping suspended structure was smaller than that of the conventional suspended structure, and the reduction effect was around 20%. The acceleration peak of the fifth suspended floor of the damping suspended structure was also smaller than that of the conventional suspended structure, but the reduction effect was particularly noticeable, up to 90%. These results show that the viscous damper has a good energy dissipation effect. Compared with the conventional suspended structure, the maximum relative displacement response of each floor of the damping suspended structure was significantly reduced. Different seismic wave inputs had different damping effects, of which the under 7 frequent earthquake of the Taft wave had the best reduction effect, while the under 8 rare earthquake of the El Centro wave was the worst. The maximum inter-storey drift angles were not great, with a maximum of 1/138 for CSS and 1/196 for DSS under rare earthquakes, which was less than that allowed by GB50011-2010 (1/100), which shows that the design of the test model is reasonable. Using viscous dampers to connect the suspended floors with the primary structure, the maximum relative displacement of them was larger than that of the conventional suspended structure, which indicates that the stronger the connection between the primary and secondary structures, the smaller the relative displacement. It was further illustrated that the damping suspended structure was consuming energy due to the swinging of the suspended floor and the viscous dampers. Compared with the conventional suspended structure, the maximum peak strain response of steel wire for the damping suspended structure was reduced by 28.4-66.1%, and for the concrete, the maximum peak strain response was also similarly decreased by 42.3-72.7%. Conceptualization, W.C., B.Y. and S.K. ; methodology, W.C.; software, W.C.; validation, W.C., B.Y. and S.K. ; formal analysis, W.C.; investigation, W.C.; resources, S.K. ; data curation, W.C.; writing--original draft preparation, W.C.; writing--review and editing, B.Y. and S.K.