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研究生:蘇珍立
研究生(外文):Chen-Li Su
論文名稱:道路受震下之裂縫分析
論文名稱(外文):The Cracking Analysis of Pavements Under Loading
指導教授:陳建旭陳建旭引用關係
指導教授(外文):Jian-Shiuh Chen
學位類別:碩士
校院名稱:國立成功大學
系所名稱:土木工程學系碩博士班
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:76
中文關鍵詞:地震由上而下裂縫非均佈高胎壓
外文關鍵詞:damage modelEarthquakehigh tire pressurenonuniformtop-down cracking
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近年來,由於交通量及載重的增加,在反覆荷重下,路面龜裂破壞有越來越嚴重之趨勢,尤其是行車輪跡處外側之表面裂縫。傳統龜裂分析模式通常採用瀝青混凝土底部之張應力應變與疲勞破壞所需次數之回歸關係式,但是這些回歸關係式皆是描述裂縫由面層底部向上之龜裂,無法解釋日趨嚴重之表面由上而下之裂縫行為,本研究即著重在模擬道路承受車輛荷重或大自然力量(地震)時,鋪面表面產生裂縫時於力學反應之變化,以及裂縫的延伸。
根據研究結果,本研究所建立之輪胎模型可合理預估實際輪胎與地面之接觸情形,且輪胎以非均佈力作用於地面上,於輪胎作用處之道路表面附近應力變化較大,且於輪胎邊緣外側之道路表面有張應力產生,當有裂縫產生於張力區,造成應力集中,由上往下之裂縫延伸將伴隨而生。裂縫尖端最大主應力隨裂縫長度、開口寬度之增加而增加;表面裂縫隨荷重歷時增加而成長,重車造成含有表面裂縫道路之裂縫尖端應力較大,與一般車輛胎壓所造成之差異達30%;且重車造成之裂縫長度比一般車輛胎壓達2倍以上,顯示重車對道路裂縫之破壞實不容忽視。
另外,道路受到地震力之影響,裂縫亦隨地震歷時增加而增加,且隨機不定地出現於表面各處,但就面層材料改質I型與AC60/70而言,兩者間整體受損情形之差異並不顯著。
One of the main pavement distresses is called top-down surface cracking. This cracking stretches from the top to the down inside a pavement structure, which is becoming a common pavement damage observed on highways in Taiwan. From field observations, these top-down cracks induced by both a high speed moving overloading and instant braking are typically longitudinal. Cracks appearing in or near wheel-paths or wheel-edges decrease in width with depth upon exposure to truck traffic and environmental conditions. There is, however, a lack of information on the development of top-down cracking mechanism on flexible pavements.
This study is to develop the top-down cracking mechanism including crack initiation and crack growth according to fracture mechanics viewpoint. Results obtained from this study can be used to predict rehabilitation time so that pavements can last longer without premature distresses. The evaluation of top-down cracking failure can help highway agencies regulate heavy vehicles and reduce the maintenance budget.

Severe natural hazard such as earthquake occur infrequently at any specific place. Man-made highways need to be prepared to sustain seismic wave. Little research, however, has been conducted to understand the behavior of road structures under quake attract. The objectives of this study are as follows: (1) collect and analyze the road damages resulting from the 921 Great Earthquake, (2) investigate the seismic stability of road structures, and (3) model vibration-induced damage for urban roads.
摘要
誌謝
目錄
表目錄
圖目錄
第一章 緒論
1-1 前言 1-1
1-2 研究動機 1-2
1-3 研究目的 1-2
第二章 文獻回顧 2-1
2-1 黏彈性理論 2-1
2-1-1 黏彈性之力學模式 2-1
2-2 疲勞裂縫之種類 2-3
2-2-1 由下而上(bottom-up)龜裂破壞模式 2-3
2-2-2 由上而下(top-down )裂縫破壞 2-5
2-3 表面裂縫形成原因 2-7
2-4 輪胎種類及對地面之接觸應力 2-9
2-4-1 輪胎結構 2-9
2-4-2 輪胎與地面間之接觸應力 2-10
2-5 龜裂破壞分析 2-13
第三章 研究方法 3-1
3-1 研究流程 3-1
3-2 理論背景 3-3
3-2-1 有限元素分析理論 3-3
3-2-2 裂縫分析模式 3-4
3-3 道路模型之建立及驗證 3-7
3-3-1 交通荷重模型及驗證 3-7
3-3-2 表面裂縫分析 3-8
3-4 地震分析模型之建立 3-13
第四章 道路表面之裂縫反應 4-1
4-1 交通荷重之影響 4-1
4-1-1 均佈與非均佈力對路面之影響 4-1
4-1-2 鋪面含有表面裂縫與否之差異 4-7
4-1-3 重車對含有表面裂縫鋪面之影響 4-16
4-2 地震作用之影響 4-20
4-2-1 震動作用下之力學反應 4-20
4-2-2 裂縫之形成與延伸行為 4-22
第五章 結論與建議 5-1
5-1 結論 5-1
5-2 建議 5-2
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