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中文標題: 被動及半主動摩擦控制於結構偏心滾動隔震系統之研究
英文標題: Study on structural isolation by eccentric rolling isolation system with passive and semi-active friction damping control strategy
編號: NCREE-12-005
語言: 中文
編輯:
媒體型式: 紙本
作者:
鍾立來   楊卓諺   高培修   陳鴻銘   
中文摘要: 結構隔震系統已被廣泛的運用在土木工程領域。然而,傳統線性隔震系統因具備線性之回復力,若面對到同樣具有低頻特性之近斷層地震力作用下,可能發生共振效應而導致隔震系統失效。針對這樣的情況,本研究提出一具有非線性回復力之偏心滾動隔震系統,該系統考慮隔震層以梢接於圓形隔震器上,且該梢接偏離圓形隔震器之圓心;並配合可調整之摩擦阻尼器,來消散系統之能量;而隔震層之上則可建置隔震標的物,如設備或上部結構。
於被動隔震,偏心隔震系受到遠域地震力作用時,能夠有相當不錯的隔震效果。而受到近斷層地震力作用下,比起相對應之線性隔震系統,能夠有更低之加速度反應。且受到共振之簡諧波作用下,因非線性之故,也能夠有效降低因共振而產生之放大效應。然被動隔震系統受到非設計地震力作用時,往往不能夠發揮其在設計地震力下同樣之隔震效果,故考慮半主動控制加以改善。於半主動隔震時,考慮具有切換之控制律,藉由適當切換邏輯,來調整增益之高或低。當隔震系統在受到小振幅地震力作用時,系統反應較小,則控制律以較小之增益,來確保隔震系統有較低之加速度反應。在大振幅地震力作用時,系統反應也相對變大,則控制律切換至較大增益,可有效降低隔震層位移,也保有不錯之加速度隔震效果。另外,以連續形式之切換控制律,相較於不連續之切換控制律,能夠有效改善控制力震顫現象。
英文摘要: Base isolation has been popular by implemented in civil engineering. However, conventional isolation system possessing linear restoring force may be invalid under a near-fault earthquake which possesses low-frequency content and may induce resonance. Therefore, the eccentric rolling isolation system (ERIS) possessing nonlinear restoring is proposed. The base, which can be mounted on a structure or equipment, is eccentrically pinned on a circular isolator; and friction damping, which can be tuned by bolts, is considered. In passive case, the ERIS performs as good as conventional linear isolation system under far-field earthquake. Subjected to near-fault earthquake, the ERIS shows better reduction in acceleration than the corresponding linear one. The ERIS also reduced the amplification under resonant sinusoidal excitation due to nonlinearity. However, the passive isolation case under non-design earthquake may not perform as well as itself subjected to design earthquake. Thus, semi-active control is considered to improve the performances of ERIS. Several switch control laws with low and high gain are investigated. The gain mode is switched by appropriate switch logic. When the system is subjected to a small earthquake, the low gain mode is taken to make sure that the system is effective. When the system is subjected to a large earthquake, the high gain mode is taken to reduce the base displacement and provide more energy dissipation. Moreover, the continuous type switch control law can mitigate the chatter and jerk which may occur for some discontinuous switch control law.
關鍵字: 隔震、非線性、偏心、摩擦、被動、半主動
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