於強震中，直接基礎可能產生搖擺現象並且減緩結構反應。 本研究將使用在搖擺效應下之滑模變結構控制於連續五跨隔震橋進行一系列分析。使用傳統LQR法及Pole Assignment 法來設計滑模變結構控制的滑動面。透過數值分析與演算法，比較傳統LQR控制，並得出滑模變結構控制之效果。結果顯示搖擺效應可以降低橋墩塑鉸旋轉角。結果也顯示，有適當滑動面之滑模變結構控制可以降低柱底韌性來達到更好的結構行為。此外，黏滯性阻尼之半主動控制與滑模變結構控制之主動控制有幾乎相同的行為。;During an extreme earthquake, the separation of footing from the underlying ground may occur and mitigate the structural response. An isolated five-span continuous isolated viaduct was analyzed to investigate the performance under the sliding mode control when the rocking of footing is taken into account. The sliding surface of the sliding mode control is designed by the conventional LQR method and Pole Assignment method. The effectiveness of sliding mode control is compared with the conventional LQR control and studied through numerical simulations and a parametric study. The results show the rocking isolation can reduce the plastic deformation of the column. It is also shown that the sliding mode control with appropriate sliding surfaces achieves a better performance compared with the conventional LQR control. Namely, using sliding mode control the column ductility decreases more as compared with the conventional LQR control. Additionally, the performance of the active control under sliding mode control can be trailed mostly by semi-active control with the variable viscous damper.
