一般建築結構基於使用性，均會提供相當勁度以限制其層間位移量，當採用液流阻尼器作為消能元件時，為放大阻尼器位移量，增加消能功能，遂有徐德修等人提出菱形機構阻尼系統，希望藉由菱形之幾何變形特性放大阻尼器之位移，達到提高阻尼器消能之目的。其經SAP2000軟體進行程式數值模擬分析，亦證實菱形機構阻尼系統確實能有效放大位移量，達到消能減振之功能。惟若依ㄧ般斜撐設計模擬該系統時，將導致該系統產生三個鉸支承反力相交於一點之幾何不穩定，且該系統無法抵抗垂直於系統之側向力，因此模擬結果會發生不穩定現象。基於此，本論文希望就一般坊間實際結合之施作模式，設定一合理之模擬方式，尋求平面菱形機構阻尼系統發生不穩定之界線，驗證菱形機構阻尼系統在施工品質精良情況下之可行性。

　　Common building structures provide enough stiffness to reduce its relative displacements between floors. While using the fluid damper as an energy-dissipating devices, it is necessary to magnify the displacement of damper to increase aseismatic energy-dissipating functions. Deh-Shiu Hsu and his colleagues propose the idea of rhombus mechanism damper system, in the hope to increase the damper displacement to dissipate energy because of the nature of rhombus deformation. By means of numerical analysis with SAP2000 software package, it is confirmed that the rhombus mechanism damper system can effectively magnify the displacements, and thus reach the goal of energy dissipation and seismic responses. However, common designs used to simulate this system show the phenomenon of unstable. Such a problem occurs because this system is geographically unstable of three-hinge’s reaction in one point, and it can’t conquer the vertical lateral force. On account of this problem, the purpose of this study is to develop a proper method of simulation under real situations. Looking for the critical of out of plane in rhombus mechanism damper system, the researcher intends to show the feasibility of such a system under actual, high quality working conditions.

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