The Theoretical Study and Practical Application of Sloped Sliding-type Isolation Bearing

• Main Authors: Sheng-Wen Huang, 黃聖雯
• Other Authors: 張國鎮
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/8fj7qq

碩士 === 國立臺灣大學 === 土木工程學研究所 === 106 === Seismic isolation system is a great solution to reducing the acceleration responses of buildings under earthquakes, and it has been widely-used over the past decade. There are three types of isolation bearings that are most common nowadays: elastomeric bearings, rolling-type bearings and sliding-type bearings. However, most of them are linear systems which cause acceleration increases with displacement. In an attempt to control the transmitted acceleration, an innovative isolation bearing system called sloped sliding-type isolation bearing (SSB) is introduced. The isolation bearing is comprised of an upper bearing plate, a lower bearing plate and a slider sandwiched between two plates. It features a constant transmitted horizontal acceleration and friction-based energy dissipation mechanism. In this study, simplified and general equations of motion are derived and analysis program is developed. The influences of the simplification assumptions are numerically investigated. Moreover, the accuracy of both equations are also experimentally verified. The results indicate that the general equations predicts more successfully than the simplified equations. In addition, the key factors, which include input vertical excitation and pounding, in the SSB dynamic behaviour are examined. It is concluded that the input vertical excitation affects the response horizontal acceleration greatly, and that the pounding-induced responses are high-frequency, which may have little impact on the superstructure. A design procedure of the SSB system is proposed to enable practical application of the isolation bearings. Furthermore, a model that can be easily applied to most commercial software is proposed as well. The seismic isolation performance of the SSB is then compared to that of the FPB using SAP2000. The simulation results suggest that the displacement responses of SSB is well-controlled under selected excitations and that the response acceleration of SSB is independent of the input excitations.