由於外力形式之隨機特性與系統識別之誤差，傳統被動調諧質量阻尼器（TMD）系統對於頻率去調諧效應十分敏感，而藉由提供額外主動控制力之擬混合型質量阻尼器（PHMD）雖可增強其強健性，然而時間延遲效應勢必產生，可能造成控制效果折減。一般而言，PHMD系統多利用油壓制動器來作為控制力得來源，因此不管是在施工或是實際運用上都有一定的限制，因此本文利用一槓桿式勁度可控式機構，作為勁度可變式質量阻尼器（LSCMD）來模擬PHMD系統的控制效果。LSCMD實際上為半主動質量阻尼器，利用機構勁度可隨時間調整的特性，來提供等值控制力以達到傳統PHMD系統的控制效果，本文中除針對平面對稱剪力屋架結構進行控制效果的探討，亦推導考慮載有LSCMD之偏心扭轉耦合結構物的運動方程式，以驗證LSCMD對非對稱結構的控制效果。

The vibration mitigation performance of a conventional tuned mass damper system (TMD) is very sensitive to the fluctuation in tuning of the designed frequency to the natural frequency of the main system. Because of the stochastic characteristics of external loading and the errors of identifying system parameters, a pseudo hybrid mass damper system (PHMD) with optimal selection on control parameters can enhance the designed performance with the help of a supplementary active force acted between the main system and the mass damper. However, the control performance degradation induced by the control force application time delay should be considered and investigated before practical application. In general, the active control force for PHMD is supplied by a hydraulic actuator that requires a lots of facilities to implement. A leverage-type stiffness controllable mechanism is adopted in this study as the s Leverage-Type Stiffness Controllable Mass Dampers (LSCMD) that has the advantage of easy installation. With the ability of providing time-varying stiffness, the control force of traditional PHMD can be supplied equivalently by LSCMD to achieve the control performance of original PHMD system. The vibration control effectiveness of both multi-story planar shear-type and torsioanlly-coupled building structures are investigated under earthquake excitations.

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