研究生: |
徐浩倫 Hao-Lun Hsu |
---|---|
論文名稱: |
高樓層房屋結構受近斷層地震 之反應研究(Ⅳ) Responses of High-Rise Buildings to Near-Fault Ground Motions (Ⅳ) |
指導教授: |
黃震興
Jenn-Shin Hwang |
口試委員: |
汪向榮
Shiang-Jung Wang 黃尹男 Yin-Nan 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: | 2022 |
畢業學年度: | 110 |
語文別: | 中文 |
論文頁數: | 140 |
中文關鍵詞: | 近斷層地震 、高樓結構反應 、非線性黏性阻尼器 、反應譜分析 、PISA 3D 、非線性動力歷時分析 、阻尼常數分配 |
外文關鍵詞: | Near-Fault Ground Motions, Responses of High-Rise Buildings, Response Spectrum Analysis, Nonlinear Viscous Damper, PISA 3D, Nonlinear Time History Analysis, Distribution of Damping Coefficient |
相關次數: | 點閱:320 下載:0 |
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由於台灣地狹人稠的特性,對建物高度的要求不斷往上提升,然而位處環太平洋地震帶,在無法避免近斷層地震(Near-Fault Ground Motions)的情況下,高樓結構在面對其所產生持續時間長且巨大的速度脈衝時,更容易遭受嚴重破壞;楊【6】之研究成果中,將上述特性於結構中所形成之特殊變形,稱為鞭狀反應,其最大特點在於產生之剪力破壞會高度集中於中低樓層,且同時會帶來極大的永久變形。
由於減震系統對於位移有較佳的控制能力,恰好適用於高樓結構因近斷層地震作用而造成的巨大位移反應,因此李【7】所做之研究嘗試於結構中裝設非線性黏性阻尼器來提升對近斷層地震之抵抗能力,然所達到之效益卻不如預期;接著黃【8】透過改善阻尼常數之分配方式,在需同時兼顧經濟性與耐震效益的前提下,成功改變結構的破壞模式,使變形均勻分散於各樓層。
本研究以黃【8】所建議之阻尼常數分配方法及平均分配法,使用於抗彎矩構架及斜撐構架不同側向力抵抗分配百分比之二元結構系統進行比較,並藉由反應譜分析對靜力分析所得之結構行為加以驗證。根據研究結果發現高樓結構之行為尚需輔以動力分析才能模擬出更加有效且合理之結果;而在近斷層地震作用下,不同阻尼常數分配方式使用於同一種結構配置和同一種阻尼常數分配方式使用於不同結構配置,所產生之結果皆不相同,其中仍有許多不確定因素需做探討,不可一概而論。二元結構系統之抗彎矩構架及斜撐構架不同側向力抵抗分配百分比所引至的互制可能不同,因此所衍生對相同阻尼係數分配方法,卻造成不同的結構反應,亦值得更深入的探討。
The damage potential of near-fault ground motions to high-rise buildings has attracted intensive research interests recently. The velocity pulse contained in the near-fault motion has caused a so-called whip-like behavior in the high-rise buildings. This is particularly important to Taiwan where the fault lines are wide spreading in the relatively small island. A good example is that a great amount of near-fault motions were recorded during the 1999 Chi-Chi earthquake. In order to resist near-fault ground motions, the distribution methods of viscous dampers along the height of the buildings have been investigated in previous studies【6】where different results from various damper placement methods have been discussed in detail.
In this study, dual systems with different percentage of base shear distributions respectively to braced frames and moment-resisting frames are studied for their inelastic responses to near-fault ground motions. In addition, the damper distribution method based on the effective story shear strain energy suggested in previous study【6】is investigated for its effectiveness in minimizing the damage potential of near-fault motions. The interactions between the braced frames and moment-resisting frames are different due to the different base shear distribution percentage respectively to the braced frames and moment frames, and thus the effectiveness of the same damper distribution method may not be the same.
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