研究生: |
林建民 Chien-Min Lin |
---|---|
論文名稱: |
垂直變位型消能裝置對結構耐震行為之影響 Seismic Performance of Structure with Vertical Damper |
指導教授: |
鄭蘩
Van Jeng |
口試委員: |
陳瑞華
Rwey-Hua Cherng 黃慶東 Ching-Tung Huang |
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: | 2006 |
畢業學年度: | 94 |
語文別: | 中文 |
論文頁數: | 182 |
中文關鍵詞: | 消能裝置 、位移型阻尼器 |
外文關鍵詞: | energy dissipation, damper |
相關次數: | 點閱:156 下載:3 |
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本論文主要在探討新式之垂直變位型消能裝置在地震下之消能行為。垂直變位型消能裝置是利用大樑間兩點不同之垂直相對變位來消散地震能量,因此能避免如一般金屬型阻尼器需搭配斜撐之安裝方式,而且安裝之限制亦較少。本研究將利用側推分析、週期載重及地震力來驗證垂直變位型消能裝置於單層樓、五層樓、十層樓及二十層樓構架之消能效果。
首先將垂直變位型消能裝置裝設於單層樓構架,探討在不同的樓層位移旋轉角下兩者間之互制關係,再利用消能裝置之消能面積與制震結構之彈性應變能面積來計算出理論等效阻尼比,並以週期載重之非線性動力分析來驗證其結果,再利用制震結構在地震下之反應來推估消能裝置之有效阻尼比。接著將同樣之分析流程延伸至五層樓、十層樓及二十層樓構架。等效阻尼比與有效阻尼比可驗證出在不同構架上之垂直變位型消能裝置,皆能有效地發揮其消能能力。最後發展出一套以靜力分析之設計流程來設計消能裝置,並推估其有效阻尼比。
研究成果如下:
1. 垂直變位型消能裝置能如預期般地有效降低結構物之地震反應。
2. 垂直變位型消能裝置之有效阻尼比在不同之結構位移下皆相近,在設計上可視為一定值。
3. 本研究針對消能裝置發展出一套以靜力分析之設計流程並且能有效預估消能裝置在地震模擬下之有效阻尼比。
4. 垂直變位消能裝置擁有不需搭配斜撐安裝及在結構不同位移下其有效阻尼比皆相近之特性,有利於降低結構在地震下之反應。
A new type of vertical damper was investigated for it’s seismic performance. The vertical damper utilized the vertical displacement of the girder to dissipate energy, therefore it avoid the bracing needed by the commonly used metallic damper and could be installed in the structure with much less restriction. Four frames of single, five, ten, and twenty storey with/without vertical dampers were studied with pus-over, cyclic excitation and seismic excitation to verify the effect of the damper.
First, single storey frame with the vertical damper was used to investigate the interaction of Vertical Damper with different storey drift ratios, and parameter study was conducted. The energy dissipation area with the structure elastic strain energy was used to calculate the theoretical equivalent damping ratio and the results was verified with the nonlinear dynamic analysis with cyclic loading. The effective damping ratio was estimated from the structural response under seismic excitation. Then five, ten and twenty storey frames were investigated with the same process. The difference between the equivalent damping ratio and the effective damping ratio of varies frames were used to demonstrate the effectiveness of the vertical damper. Finally, a simplified static process was developed for designing the vertical damper system with estimated effective damping ratio.
The research results are as follows:
1. The Vertical Damper could reduce the seismic response of structure as expected.
2. The effective damping ratios of vertical damper system for different storey drift ratios were similar and could be considered as constant for design purpose.
3. A static design process was developed for designing vertical damper system with estimated effective damping ratio.
4. The vertical damper system with no bracing needed and stable effective damping ratios across different storey drift ratios make it favorable for seismic mitigation of structures.
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