在離岸海域中，風力發電機受到來自風、波浪、洋流、船隻行駛造成之衝擊以及地震等反覆側向作用力。這些長時期或短期的反覆側向作用力會使得承受離岸風力發電機整體結構產生側向位移及傾側。由於承載著基礎結構為地表之土壤，在模擬這種反覆側向側向作用情況下，本研究應用Kuo(2008)勁度衰減模型(Degradation Stiffness Model)概念，並以群樁式基礎在勁度衰減模型和配合有限元素法下，模擬在非凝聚性土壤中受反覆作用力之變形行為，模擬群樁中各樁隨反覆作用力次數加之行為，以提供一個可提供工程參考之數值方法，來評估離岸海域群樁結構物在反覆作用下之側向變形行為。

Offshore structures including wind turbine foundation suffer from long term and short term cyclic lateral load, example wave loading, wind loading, vessel impact and earthquake which will make the overall structure of offshore wind turbines produce lateral displacement and tilt. This study apply Kuo(2008)’s Degradation Stiffness Model concept and using Finite Element Method to model cyclic lateral load under cohesiveness soil on the group pile foundation deform behavior with the increase of the cyclic numbers. And provide this reference apparatus to evaluate the deform behavior on the offshore group pile foundation suffer from cyclic lateral load.

1. Brown, D. A., Morrison, C., and Reese, L. C. (1988) “Lateral Load Behavior Of Pile Group In Sand.” J. Geotech. Engrg, Vo. 114, pp.1261-1276.
2. EAU,(2004). Recommendations of the Committee for Waterfront Structures, Wiley-VCH.
3. Elson, W. K. (1984). Design of Laterally-Loaded Piles, Construction Industry Research and Information Association, London.
4. Fleming, K., Weltman, A., Randolph, M., and Elson, K., Piling Engineering, Taylor & Francis, London and New York.
5. Hannigan, P. J., Goble, G. G., Likins, G. E., and Rausche, F. (2006). Design and Construction of Driven Pile Foundations, Federal Highway Administration, U.S. Department of Transportation.
6. Kim, B. T., Kim, N. K., Lee, W. J., and Kim, Y. S. (2004). “Experimental Load–Transfer Curves of Laterally Loaded Piles in Nak-Dong River Sand.” Journal of geotechnical and geoenvironmental engineering, Vo.130, pp. 416-425.
7. Kuo, Y. S. (2008) “On the behavior of large-diameter piles under cyclic lateral load.” Ph.D. thesis, Heft 65, Leibniz Universität Hannover.
8. Long, J. H., and Vanneste, G. (1994). “Effects Of Cyclic Lateral Loads On Piles In Sand.” J. Geotech. Engrg, Vo. 120, pp. 225-244.
9. Leung, C. F. and Chow, Y. K. (1987) “Response Of Pile Groups Subjected To Lateral Loads.” International journal for numerical and analytical methods in geomechanics, Vo. 11, pp.307-314.
10. Ooi, P. S. K., Chang, B. K. F., and Wang, S. (2004).” Simplified Lateral Load Analyses of Fixed-Head Piles and Pile Groups.” Journal of geotechnical and geoenvironmental engineering, Vo.130, pp. 1140-1151.
11. Poulos, H. G., Davis, E. H. (1980). Pile Foundation Analysis and Design, John Wiley and Sons, The University of Sydney.
12. Reese, L. C., Wang, S. T., Arrellaga, J. A., Hendrix, J., and Vasquez, L. (2006). Group 7.0 user’s Manual, ENSOFT, Inc.
13. Reese, L. C., and Impe, W. F. V. (2001). Single Piles And Pile Groups Under Lateral Loading, A.A. Balkema, Netherlands.
14. Sayed, S., and Bakeer, R. (1992). “Efficiency Formula For Pile Group.” J. Geotech. Engrg, Vol. 118, pp. 278-299.
15. Znamensky, V. V., and Konnov, A. V. (1985). “Calculation of bearing capacityof laterally loaded pile groups” Proceedings of the eleventh international conference on soil mechanics and foundation engineering, Vol. 3, pp. 1511-1514.
16. 胡邵敏(2009)，樁基工程，地工技術研究發展基金會。
17. 內政部營建署(2001)，建築物基礎構造設計規範，內政部營建署。
18. 吳佳梁(2010)，海上風力發電技術，化學工業出版社。
19. 李協謙(2008)，「群樁側向阻抗改良之數值模擬」，國立中央大學土木工程學系碩士論文。
20. 陳廣祥(2010)，「模型群樁在砂中的試驗探討樁斷面慣性矩及形狀改變對樁承受側向反覆載重行為的影響」，逢甲大學土木工程學系碩士論文。