| 姓名 | 鄭丁榮(Tin-lon Jen) | 電子郵件信箱 | qoo9111631@yahoo.com.tw | |
| 畢業系所 | 營建工程系碩士班(Department and Graduate Institute of Constrction Engineering) | |||
| 畢業學位 | 碩士(Master) | 畢業時期 | 92學年第2學期 | |
| 論文名稱(中) | 排樁對方形振動基礎的減震效應之研究 | |||
| 論文名稱(英) | The Efficiency of Wave Isolation for Square Vibration Foundation Using Piles in a Row | |||
| 檔案 |
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論文使用權限 | 校內外完全公開 | |
| 論文語文/頁數 | 中文/136 | |||
| 摘要(中) | 本文利用三維頻率域邊界元素法分析剛性無質量之方形基礎，在簡諧之垂直外力作用下，以圓形斷面的排樁作為被動減震機制，研究其對排樁後方地表振幅的減震效果。本研究所探討的減震效果之影響參數，包括排樁材質、排樁幾何尺寸及排樁與震源之中心距離等。所得的分析結果皆以平均振幅降低比對各影響參數繪製成圖，再進行分析比較，且整理出結果與建議，以供工程界作為日後排樁減震方面之參考。 在排樁減震方面，本研究所分析的排樁種類有混凝土實心排樁、木材實心排樁、混凝土空心排樁、鋼管排樁等四種類型的排樁。在混凝土實心排樁以及木材實心排樁中、排樁長度對減震效果的影響最大，其次為排樁間距，而排樁與震源之中心距離的減震效果影響很小，可忽略不計。排樁長度為2倍雷利波波長，排樁間距為0.05倍至0.1倍雷利波波長為混凝土實心排樁以及木材實心排樁之最佳參數值，而排樁長度為1.5倍雷利波波長，排樁間距為0.05倍至0.1倍雷利波波長，排樁與震源之中心距離為2倍雷利波波長是混凝土空心排樁之最佳參數值。鋼管排樁為討論的排樁型式中減震效果最佳者，在本文之討論範圍中，鋼管排樁皆可有效地達到減震效果，即平均振幅降低比小於0.4。 | |||
| 摘要(英) | The paper is to
investigate the effectiveness of vibration isolation for the waves
generated by square foundation subjected to vertical harmonic vibration
using a row of round-section piles. Three-dimensional boundary element
method in frequency domain is used in this study. The main parameters
are considered in this study, including dimensions of solid or void
pile, such as material properies of pile, space of piles, and position
of piles. To study the efficiency of wave isolation, vertical average
amplitude reduction ratio behind a row of piles was analyzed. There were four types of pile was considered, such as concrete solid pile, timber pile, concrete hollow pile and steel pipe pile. use of concrete solid pile and timber pile as barriers, the length of pile is main influential factor, next to the space of piles. However, the position of piles in a row is insignificant on vibration isolation. The optimized length of concrete solid piles or timbar piles as barriers is suggested to be 2.0 LR , and the space of piles is from 0.05 LR to 0.1 LR, in which LR is defined to be wavelength of Rayleigh wave. In case of concrete hollow piles, the pile length of 1.5 LR, the space of piles from 0.05 LR to 0.1 LR, and the distance from foundation to pile of 2.0 LR are the best dimensions of wave barriers. Besides, steel pipe piles are optimum wave barriers of four types of pile in this paper. In general, they make Ary to be smaller than 0.4. | |||
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