近斷層地震(Near-Fault Ground Motions)比起遠域地震(Far-Field Ground Motions)對長週期結構更具有破壞力，其原因為近斷層地震具有巨大且長時程的速度脈衝。由楊【6】研究結果得知，高樓層結構受近斷層地震作用可能出現一種特殊變形反應，將其稱為鞭狀反應，會於結構之中低樓層產生集中且嚴重的剪力破壞，並造成結構極大的永久變形。
安裝結構控制系統為現今常用以提升結構物耐震能力的方法，其中又以被動控制系統消散地震能量的方法更廣泛地被使用，被動控制系統主要分為隔震系統與減震系統兩大範疇。李【7】研究採用減震系統，在結構物中加裝非線性阻尼器吸收能量，藉由減少梁柱構架本身所承受之地震能量以達到提升耐震能力之效果，然而對於近斷層地震作用下的效益並不理想。
本研究透過改變阻尼常數分配方法與考慮高樓結構中的撓曲作用改善非線性阻尼器於近斷層地震作用下的效益。依本研究結果，採取本文中建議的阻尼常數分配方法，會改變近斷層地震於中低樓層產生集中的破壞模式，變形反而均勻分散於多數樓層。此阻尼器設計方法不僅能避免因局部樓層嚴重破壞導致結構物倒塌的情況，根據阻尼器最大出力與總安裝支數判斷其總成本也將降低，故此方法兼具耐震效益與經濟性。

In a pilot study of this research series conducted by Yang【6】, it was concluded that a special feature of deformation, called whip-like response, may cause severe damages to long period buildings subject to near-fault ground motions. The intensive velocity and/or displacement pulses of the near-fault ground motions have been recognized as one of the major causes for the severe damages to the building structures. More significantly, these damage features are different from those induced by far-field ground motions.
The installation of structural control systems is a commonly used method to improve the earthquake resistance of structures. Among others, energy dissipation design using structural dampers has been widely adopted in the past decades. In a study of this research series conducted by Li【7】, adding nonlinear viscous dampers to improve the seismic performance is not efficient unless that sufficient damping ratio is provided. However, for high-rise buildings to add a large damping ratio to the structure may not be economically preferred.
This study improves the effectiveness of nonlinear viscous dampers under near-fault ground motions by changing the distribution of damping coefficient and deducting the influence of flexural effect that is considered to be ineffective in the damping contribution to the high-rise building. Based on this study, the proposed distributions of damping coefficient change the concentrated damage style to a limited number of stories of the building when subjected to near-fault ground motions. In contrast, the inelastic deformation is smaller and is more uniformly distributed to much more stories of the building. This damper design method not only avoids the collapse of the structure due to severe damages located at a very limited number of stories, but also reduce the total cost due to the less number of dampers are needed to achieve the desired damping ratio. Consequently, the proposed method is effective and economical for the damage control of high-rise buildings under the excitation of near-fault ground motions.

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