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研究生： 賴怡成
Lai, Yi-Chen
論文名稱： 探討FWD模擬試驗中落錘質量之必要性與鋪面影響範圍
The effect of the falling mass and the slab size on modeling FWD test
指導教授： 郭振銘
Kuo, Chen-Ming
學位類別： 碩士
Master
系所名稱： 工學院 - 土木工程學系
Department of Civil Engineering
論文出版年： 2007
畢業學年度： 95
語文別： 中文
論文頁數： 60
中文關鍵詞： 落重式撓度儀 、落錘 、鋪面 、衝擊力 、反算 、模擬試驗
外文關鍵詞： backcalculation, FWD, slab size, pulse, falling mass
相關次數： 點閱：71  下載：12 
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    • 落重式撓度儀 ( Falling Weight Deflectometer , FWD)利用落錘自由落下撞擊路面以得到衝擊載重與鋪面面層變形的關係，再代入反算程式得知鋪面材料現有的強度，用來做為鋪面維修評估之依據。現今各種模擬FWD之模型是基於不同理論下所發展出來，其共通點為皆以作用力歷時取代實際落錘，本研究針對忽略落錘質量對模擬精確度的影響及鋪面影響範圍進行分析探討。
    本研究以有限元素軟體ABAQUS分別建構具有落錘之模型與僅受衝擊作用力之鋪面模型。以比較兩模型計算所得之變位歷時之差異，探討落錘實體對鋪面遭受衝擊時之變位影響。針對鋪面模型之影響範圍、落錘模型4種落距、橡膠墊之阻尼、落錘與鋪面之質量比、路基阻尼等不同因素，進行敏感度分析，以助釐清並掌握FWD數值模擬分析時之正確特性，提高未來FWD反算程式之精確度。

    FWD (Falling Weight Deflectometer) used the mass falling on the pavement to get the relation between the impulse and the deflection. Thus, used this information to backcalculate the sfiffness of the pavement. Today many FWD simulated model are developed on the basis of different theories, but all of them are used a time history of impulse to simulate the falling weight. This study disscusses the effect of falling mass and the slab size on modeling FWD test.
    This study used ABAQUS to construct the model which used the falling mass and the model which used the time history of pluse force. On the basis of different falling height, the slab size, the damping of roadbed and rubber and the falling mass to disscuss the deflection of the pavement. And using the result of this study to check the accuracy of FWD backcalculation methods.

    摘要.................................................................................................................Ⅰ Abstract...........................................................................................................Ⅱ 致謝.................................................................................................................Ⅲ 目錄.................................................................................................................Ⅴ 表目錄.............................................................................................................Ⅶ 圖目錄.............................................................................................................Ⅷ 第一章 緒論.....................................................................................................1 1.1 前言......................................................................................................1 1.2 研究動機與目的..................................................................................1 1.3 研究範圍與方法..................................................................................2 1.4 論文架構與流程圖..............................................................................3 第二章 文獻回顧.............................................................................................6 2.1 FWD試驗簡介....................................................................................6 2.2 ABAQUS軟體簡介...........................................................................10 2.3 FWD模擬方法介紹..........................................................................11 第三章 FWD模型之建立..............................................................................15 3.1 靜力模型建立與驗證........................................................................15 3.1.1 靜力模型介紹...............................................................................16 3.1.2 靜力模型驗證...............................................................................17 3.1.3 邊界條件.......................................................................................18 3.1.4 網格切割方法之影響...................................................................18 3.2 動態模型建立與驗證........................................................................19 3.2.1 落錘模型建立與驗證.................................................................20 3.2.2 FWD落錘模型建立...................................................................21 3.2.3 衝擊力模型建立.........................................................................22 3.2.4 與現地試驗資料比較.................................................................23 第四章 FWD落錘模型與衝擊力模型之比較..............................................26 4.1 衝擊力分析之方法............................................................................26 4.2 落錘分析與衝擊力分析之比較........................................................27 4.3 考慮路基阻尼效應............................................................................36 第五章 鋪面影響範圍之分析.......................................................................42 5.1 鋪面版網格重新切割........................................................................42 5.2 影響範圍分析....................................................................................43 5.2.1 靜力分析.....................................................................................43 5.2.2 動態分析.....................................................................................48 5.2.3 靜力分析與動態分析之比較.....................................................52 第六章 結論與建議.......................................................................................55 6.1 結論....................................................................................................55 6.2 建議....................................................................................................57 參考文獻.........................................................................................................58 作者簡述.........................................................................................................60

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    9. Dieter F.E. Stolle and Gabriel Sedran, “Influence of inertia on falling weight deflectometer (FWD) test response” , Canadian Geotechnical Journal, v6, No.9, p.1044-1048, 1995

    10. 劉士豪，「鋪面受衝擊力之分析與比較」，成功大學土木工程學系碩士論文 , 2006

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    12. 周明輝，「鋪面落重式撓度儀之校正與成效評估研究」，中原大學土木工程學系碩士論文，2001

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