| 研究生: |
賴志忠 Zh-Zhong Lan |
|---|---|
| 論文名稱: |
沉箱碼頭受震反應及側向位移分析 |
| 指導教授: |
李崇正
Chung-Jung Lee |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 畢業學年度: | 89 |
| 語文別: | 中文 |
| 論文頁數: | 115 |
| 中文關鍵詞: | 沉箱 、土壤液化 、剪力波速 、相差 、側向位移 |
| 外文關鍵詞: | caisson type quay wall, liquefaction |
| 相關次數: | 點閱:7 下載:0 |
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研究結果顯示,於受震反應部分,滲透係數愈低之土壤,土壤液化導致加速度震幅及剪力波速Vs降低之幅度愈顯著;受震期間,超額孔隙水壓上升後,整體勁度降低,沉箱基本震動模態會由高頻轉至低頻,對低頻的輸入運動較為敏感。且沉箱本身之水平震動模態、旋轉模態與地震記錄及沉箱與背填土間均存在著相差之關係,滲透係數愈低的土壤,水平震動模態、旋轉模態與地震紀錄之相差及沉箱與背填土間之相差愈大。
側向位移分析部分,本研究根據Siddharthan(1992)針對乾砂提出擋土牆之複合運動方程式作一修正,將水之影響在力平衡方程式中考慮。根據此種觀念推導動態平衡方程式,經程式計算結果與離心模型試驗結果及台中港現地災害案例做比較,有不錯的準確度,可提供業界在沉箱受震引致側向位移分析時的參考。
In this thesis, observed the relationship of phase shift, the reduction of acceleration amplitude and shear wave velocity resulted from liquefaction. Not only relationship of phase shifts between input motion and responses of the quay wall, including horizontal translation mode, rotation model and input base motion, but also that between the responses of the quay wall and the backfill are found. In addition, the fundamental frequency of the quay wall is reduced to a lower frequency due to the reduction of system stiffness resulted from the excess pore water pressure increased during vibration. The phenomenon is more apparent when the coefficient of permeability of soils is lower.
Coupled equations of motion presented by Siddharthan al. (1992) were revised by considering the influence of water. A revised procedure for determination of lateral displacement of the quay wall will be proposed. The comparison of results between numerical analysis and centrifuge tests is well. The result of numerical analysis is closed to the hazard in Taichung Harbor. The methodology can be well applied to a caisson type quay wall design in engineering.
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