abstract

The present thesis includes two study-phases. In the first phase, seismic behavior of base-isolated structures, including soil-structure interaction (SSI) effect, is investigated. In order to do a parametric study, three types of soil, four well-known earthquakes and a vast range of period of the superstructure is considered.

Simulation results indicate the necessity to consider SSI effects on the structures. In the second phase, these studies are carried out on smart baseisolated structure. The adopted control algorithm for tuning the control force has a key role in successful implementation of the structures; however, in most studied carried out in the literature, these algorithms are designed without considering the SSI effect.

Considering the SSI effects, a linear quadratic regulator (LQR) controller is employed to seismic control of smart baseisolated structure. Similar to the first phase, a wide- range parametric study is conducted to assess the SSI effect on seismic control process seismic of smartbase isolated structures.

The results show that the design of the controller is very influenced by the SSI effect. Furthermore, the simulation results demonstrate that the ignoring the SSI effect provides an unfavorable control system which may lead to decline in the seismic performance of the smart-base isolated structure including the SSI effect. Keyword: Base isolation, soil-structure interaction, smart base-isolated structures, LQR controller, particle swarm optimization algorithm

کلمات کلیدی: جداسازی پایه، اندرکنش خاک و سازه، .() سازه هوشمند جدا شده در پایه، کنترل کننده LQR، الگوریتم بهینه سازی ازدحام ذرات