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| 研究生： |
黃柏智 Bo-Jr Huang |
|---|---|
| 論文名稱： |
黏性阻尼器銜接斜撐勁度對結構減震效益之影響 Effects of Stiffness of Damper-Connecting Braces on Seismic Responses of Structures |
| 指導教授： |
黃震興
Jenn-Shin Hwang |
| 口試委員: |
張國鎮
none 蔡克銓 none 黃世建 none |
| 學位類別： |
碩士 Master |
| 系所名稱： |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
| 論文出版年： | 2005 |
| 畢業學年度： | 93 |
| 語文別： | 中文 |
| 論文頁數： | 173 |
| 中文關鍵詞： | 斜撐勁度 |
| 外文關鍵詞： | Brace stiffness |
| 相關次數： | 點閱：243 下載：6 |
| 分享至: |
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摘要
房屋結構物加裝黏性阻尼器作為減震設施時，皆會銜接斜撐系統，當黏性阻尼器與斜撐系統銜接後，可視為一黏性阻尼器與斜撐串聯的小系統，此時若斜撐勁度不足，則此一小系統將呈現黏彈性的力學行為，而此一行為與目前設計規範中黏性阻尼器不具儲存勁度之假設或認知並不相符。本研究從單自由度模型著手，推導考慮斜撐系統勁度時，線性黏性阻尼器減震結構物之整體等效阻尼比之公式，並由制震性能曲線之觀點探討斜撐勁度對黏性阻尼器減震結構物加速度及位移反應之影響。另外，由於不同型式之斜撐系統對放大阻尼器之位移及力量之能力亦不相同，因此本研究將阻尼器位移放大因子 一併納入單自由度模型之等效阻尼比之公式推討，並針對四種不同型式之斜撐系統(對角斜撐、K型斜撐，上肘型斜撐與下肘型斜撐)，求其等效斜撐勁度。最後，將此一單自由度系統推廣到多自由度系統。
在數值分析例方面，本研究以SAP2000N軟體進行數值模擬，對象包含一單跨單層樓及一棟十層樓八跨之三維構架，由分析結果顯示無論何種斜撐型式，當斜撐勁度不足時，將會降低結構物之整體阻尼比，且在地震作用時阻尼器之減震效能將會減弱，而透過本文所推導之相關公式，設計者可評估各種斜撐系統之等值勁度，在設計時便可掌握斜撐之勁度，以確保阻尼器能正常發揮其功能，此外，本文並提供兩種解決實際工程中，斜撐勁度不足之改善方法，其效果良好，可提供設計者作為參考。
Abstract
It is the common practice that the viscous dampers are connected in series with braces while installed to a building structure. This sub-system composed of the viscous damper and connecting brace may reveal a visco-elastic behavior rather than a viscous behavior if the stiffness of the brace is insufficient. However, the design formulas provided by current design codes and provisions have implied a sufficiently stiff behavior for the connecting braces such that the sub-system is purely viscous and reveals no storage stiffness. Therefore, it is the aim of this study (1) to ascertain the effect of the stiffness (or more exactly the flexibility) of the connecting braces in affecting the control effectiveness of the viscous dampers; and (2) to derive the design formulas of viscous dampers considering the effect of the stiffness of the connecting braces. Four often used installation schemes of viscous dampers including the diagonal-brace-damper system, K-brace-damper system, Upper toggle-brace-damper system and lower toggle-brace-damper system are included in this study. The amplification factors corresponding to these four installation schemes are included in the formulations, in addition to the effective stiffness of the braces in the axial direction of the dampers.
Numerically examples are used to illustrate the loss of effectiveness of the viscous dampers in controlling the seismic responses of building structures when the stiffness of the connecting braces to the dampers is insufficient. It is also demonstrated that design formulas proposed in the study considering the effect of the bracing stiffness can be used to design the viscous dampers to achieve the target damping ratio contributed by the viscous dampers. The proposed formulas are numerically validated and should be used for the design for viscous dampers to be installed to building structures.
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