非線性滾動隔震系統輔以線性黏滯消能器之研究

Study on Nonlinear Rolling Isolation Systemwith Linear Viscous Damper

鍾立來(Lap-Loi Chung) ； 謝姃馨(Cheng-Hsin Hsieh) ； 楊卓諺(Cho-Yen Yang) ； 吳賴雲(Lai-Yun Wu) ； 陳鴻銘(Hung-Ming Chen)

《中國土木水利工程學刊》 23卷2期 (2011/06) Pp. 175-186

https://doi.org/10.6652/JoCICHE.201106_23(2).0005

摘要

傳統線性隔震系統，具固定之隔震頻率，須考慮此類隔震系統於近斷層的共振效應所產生更大破壞。本文旨在探討非線性滾動隔震器加裝黏滯阻尼器後之動力行為。質塊以支點梢接於圓形隔震器上，且支點可偏離圓心，而阻尼器連接圓心與地表。在遠域El Centro地震作用下，非線性系統之位移為線性系統的63%至78%；加速度則為75%至79%。若外力為近斷層Chi-Chi地震時，非線性系統在位移部分約為線性系統的69%至88%；加速度則為55%至92%。因此，非線性系統不論在遠域或近斷層地震下，皆能發揮比線性系統更佳之隔震性能。縱然在共振之sine波下，隔震系統會因共振效應而放大，但非線性系統之反應低於線性系統，約為線性系統之50%。

關鍵字

非線性隔震 ； 滾動 ； 偏心比 ； 黏滯阻尼

並列摘要

In conventional isolation systems, the natural frequency is fixed for those linear systems. Some researches show that those linear systems may fail under near-fault earthquakes. In this paper, a nonlinear rolling isolation system equipped with viscous damper has been studied. The mass block is pin connected on a circular isolator eccentrically, and the damper is connected between the center of the circular isolator and ground. From numerical results, the proposed nonlinear isolation system performs better than the linear isolation system. In far-field El Centro earthquake, the displacement for the nonlinear system is 63 to 78% of the linear one, and the absolute acceleration for the nonlinear system is 75 to 79% of the linear system. If the excitation is changed to near-fault Chi-Chi earthquake, the displacement for the nonlinear system is 69 to 88% of the linear system, and the absolute acceleration is 55 to 92% of the linear system. As a whole, the nonlinear isolation system always performs better than the linear system no matter the excitation is far-field or near-fault. Furthermore, the responses of isolation systems may amplify under resonant sine wave excitation, but the responses of the nonlinear system are smaller and roughly 50% of the linear isolation system.

並列關鍵字

nonlinear isolation ； rolling ； eccentricity ； viscous damping