研究生: |
曾繹豪 Yi-Hao Tseng |
---|---|
論文名稱: |
近斷層地震參數對隔震系統之影響 Effects of Near-Fault Ground Motion Characteristics on Seismic Isolation Systems |
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: | 2019 |
畢業學年度: | 107 |
語文別: | 中文 |
論文頁數: | 289 |
中文關鍵詞: | 近斷層地震 、速度脈衝 、隔震系統 、等效線性分析 |
外文關鍵詞: | near-fault earthquakes, velocity pulse, isolation system, equivalent l inear analysis |
相關次數: | 點閱:375 下載:1 |
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近斷層地震對於柔性房屋結構的破壞潛勢往往超過一般遠域地震,根據1971年Bertero的研究可以發現,Maximum Incremental Velocity是造成結構破壞的一大主因,1995年John Hall的研究顯示出近斷層地震會造成一地表位移脈衝,此位移脈衝會對結構造成破壞並且產生巨大殘餘變形(Residual Deformation)。
2007年Baker利用小波分析發展出一套判識別近斷層地震的標準,利用擷取地表速度脈衝的方式建立脈衝指標(Pulse Indicator),將脈衝指標採納為評斷近斷層地震的標準。根據Baker的判斷標準,本研究嘗試藉由隔震系統對於不同近斷層地震的位移反應結果探討Maximum Incremental Velocity (MIV)與Duration of Maximum Incremental Velocity (TIV)兩近斷層地震參數的重要性。
由於現今隔震設計規範採靜力分析方法,此規範分析方法是由等效線性分析(Equivalent Linear Analysis)所衍生而來,因此搜集不同等效線性模型(Equivalent Linear Model),利用不同近斷層歷時及遠域歷時資料進行等效線性動力分析(Equivalent Linear Dynamic Analysis)與非線性動力分析(Nonlinear Dynamic Analysis),藉由兩者結果比較,探討等效線性模型是否可以準確預測近斷層地震作用下之非線性動力反應結果。
The damage potential of near-fault ground motions to structures, in particular the flexible structures such as seismically isolated structures and high-rise buildings, may be much more than that of far-field ground motions. In 1971, Mahin and Bertero discovered that the “maximum incremental velocity” could be one of the indices to well represent the damage potential of near-fault ground motions. In 1995, John Hall et al. showed that the displacement pulse contained in the near fault ground motions could also be another index demonstrating damage potential of near fault ground motions. Considering the two important findings, this study is conducted with an intension to investigate the significance of a parameter which is composed of the maximum incremental velocity (MIV) and the duration of maximum incremental velocity (TIV). The MIV is multiplied by TIV as an index for the seismic response demand on isolation systems by near fault ground motions.
For design purpose of isolation system against near-fault ground motions, the current isolation design specifications generated from equivalent linear analysis are examined for their accuracy and appropriateness in predicting the seismic responses of isolation system subject to near fault ground motions. Maximum seismic responses obtained from various equivalent linear models using linear dynamic analysis are compared with those determined by nonlinear dynamic analysis. In addition, maximum responses predicted using iterative static analysis as employed by current seismic isolation design codes are used to compare with the results from nonlinear dynamic analysis so that the damping reduction factor can then be examined for its appropriateness.
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