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研究生：	游友娟 Yu, Yu-Chuan
論文名稱：	運用應力強度因子預測反射裂縫模型 Prediction of reflective cracking with stress intensity factor
指導教授：	郭振銘 Chen-Ming, Kuo,
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：	2005
畢業學年度：	93
語文別：	英文
論文頁數：	32
中文關鍵詞：	應力強度因子、反射裂縫
外文關鍵詞：	reflective cracking, stress intensity factor
相關次數：	點閱：71 下載：2
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　　反射裂縫是柔性加鋪於剛性路面常發生的問題，一般分析研究反射裂縫的做法，在實驗室中以重複載重施加於瀝青梁，得到疲勞次數與試體破壞的關係，或以電腦模擬的方法，研究裂縫趨勢，得之加鋪系統的成效。但鋪面材料的破壞，若能引入破壞力學的基本概念，更能微觀且精確掌控結果，符合實際鋪面行為，量化在交通載重或溫度載重下鋪面損害及裂縫成長的情況。本研究以應力強度因子(K值)作為加鋪系統破壞勢能的指標，透過精確的K值，再以Paris’s的裂縫擴散方程，預測系統的破壞潛能(裂縫擴散速率)，及配合加勁格網之S-N曲線方程，求取鋪面壽命，發現加勁材對加鋪系統的效果，並不在延緩裂縫發生的時間，而是在裂縫成長過程中，加勁材的抗張強度使得加鋪系統得以承受大量的反覆載重，增加加鋪系統的壽命。研究也發現，加勁材的彈性模數對加鋪系統的壽命沒有明顯的相關。加勁系統若用於較軟弱的路基，成效將會比較明顯。

　Reflective cracking is a common type of distress that occurs on composite AC/PCC pavement. Two main ways to analyze reflective cracking were developed. One is getting the relationship between fatigue life and failure by applying cyclic loading on asphalt beam in laboratory, the other is to research the tendency of cracking by computer simulation. It is not only microcosmic and accurate, but also quantifying the damage from traffic loading and temperature loading if analysis base on fracture mechanics. Cracking growth speed (failure potential) is predicted by stress intensity factor and Paris’ Law. Also, Use S-N curve to predict fatigue life of glassgrid. The first finding in this research is that the glassgrid does not delay happening of cracking, but it is effective on extending life of the system in the process of crack propagation because of its tensile strength. The result indicated that an increase in the stiffness of the geogrid is not related well to the fatigue life. The reinforcement effect was more pronounced for weaker subgrade foundation.

Abstract…………………………………………………………………..I
Acknowledgement……………………………………………………….II
Contents…..……………………………………………………………..III
List of Figures…………………………………………………………..IV
List of Tables…………………………………………………………….V


Chapter 1  Introduction………………………………………………….1
1.1  Motive…………………………………………………………….1
1.2  Research scope……………………………………………………2
1.3  Literature review………………………………………………….3
1.3.1  Research of reflective cracking……………………………3
     1.3.2  Application of principle of fracture mechanics……………5
     
Chapter 2  Model development and validation………………………….8
2.1  Research procedures……………………………………………..8
2.2  Pavement Model development…………………………………10
     2.2.1  Model introduction……………………………………….10
     2.2.2  Interface treatment………………………………………..14
2.3  Model validation………………………………………………..15
   2.3.1  Rationality validation…………………………………….15
   2.3.2  Sensitivity of mesh validation……………………………16

Chapter 3  Analysis and discussion of mechanism of reflective cracking……………………………………………………18
  3.1  The performance of composite system…………………………18
     3.1.1  Stress intensity factor……………………………………..18
     3.1.2  Paris’ Law………………………………………………...20
     3.1.3  S-N curve of glass-fiber…………………………………..22
  3.2  The effect of the stiffness of glassgrid……………..………...…25
  3.3  The relationship between the performance and subgrade……...28
  
Chapter 4  Conclusion…………………………………………………29
    
References………………………………………………………………30
                                    

1. S. F. Brown, N. H. Thom and P. J. Sanders, “A study of grid reinforced asphalt to combat reflection cracking”, Association of Asphalt Paving Technologists Annual Meeting 2001.

2. 詹瑞文，「鋪面加鋪結構之模凝與探討」，碩士論文，國立成功大學土木研究所，1999。

3. 許倉榮，「分析加勁格網瀝青加鋪鋪面之反射裂縫行為」，碩士論文，國立成功大學土木研究所，台南，2001。

4. B. J. Dempsey, “Development and Performance of Interlayer Stress-Absorbing Composite in Asphalt Concrete Overlays”, Transportation Research Record, n 1809, 02-3111, 2002, p175-183.

5. N. F. Coetzee and C. L. Monismith, “Analytical Study of Minimization of Reflection Cracking in Asphalt Concrete Overlays by Use of a Rubber-Asphalt Interlayer”Transportation Research Record700, TRB, National Research Council, Washington, D.C.,1979, pp100-108.

6. W. Joe, “Overlay Construction and Performance Using Geotextiles”, Transportation Research Record, n1248, p.24-33.

7. D. T. Chang, R. Q. Lai, J. Y. Chang and Y. H. Wang, “Effects of Geogrid in Enhancing the Resistance of Asphalt Concrete to Reflection Cracks”, Flexible Pavement Rehabilitation and Maintenance, ASTM STP 1348, p.39-51.

8. 林源富，「運用高階有限元素解破裂點尖端應力強度因子」，碩士論文，國立成功大學機械工程所，台南，2002。

9. E. B. Owusu-Antwl, L. Khazanovich, and L. TitusGlo, “Mechanistic Based Model for Predicting Reflective Cracking in Asphalt Concrete-Overlaid Pavements”, Transportation Research Record, n 1629, 98-1118, p234-241.

10. G. S. Cleveland, J. W. Button and R. L. Lytton, “Geosynthetics in Flexible and Rigid Pavement Overlay Systems to Reduce Reflection Cracking”,Project number 0-1777, Texas Transportation Institute 2002.

11. B. D. Agarwal and L. J. Broutman, “Analysis and Performance of Fiber Composites”. Second edition 1990.

12. David Broek, Elementary Engineering Fracture Mechanics, fourth revised edition 1984.

13. 王永康，「以邊界元素法解析應力強度因子問題」，碩士論文，國立成功大學土木研究所，台南，1988。

14. J. F. Mandell, “Fatigue Behavior of Fibre-Resin Composites”, Developments in Reinforced Plastics-2, G. PRITCHARD 1982.

15. H. I. Ling, M.ASCE, and H. Liu, “Finite Element Studies of Asphalt Concrete Pavement Reinforced with geogrid”, Journal of Engineering Mechanics, P.801~811,JULY 2003.

校內：2006-08-04公開
校外：2006-08-04公開

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