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Optimal Design of Breakwater Caisson Considering Expected Total Construction Cost and Allowable Sliding Distance  

Kim Kyung-Suk (School of Civil, Urban and Geosystem Engineering, Seoul National University)
Suh Kyung-Duck (School of Civil, Urban and Geosystem Engineering, Seoul National University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.17, no.4, 2005 , pp. 280-293 More about this Journal
Abstract
In this study, a model to calculate the expected total construction cost has been developed by combining a model to calculate the sliding distance of a caisson of a vertical breakwater and a model to calculate the rehabilitation cost of a caisson. The optimal cross-section of a caisson of a vertical breakwater is defined as the cross-section that requires a minimum expected total construction cost within the allowable limit of caisson sliding. Two allowable limits are considered: 0.1 m of the expected sliding distance during the lifetime of the breakwater and 0.1 of the probability that the cumulative sliding distance during the lifetime of the breakwater is greater than 0.3 m. A discount rate has also been introduced to convert the future rehabilitation cost to the present value. The introduction of the discount rate reduces the expected total construction cost for the caissons designed for shorter return periods due to frequent rehabilitations. The present design method requires a smaller cross-section than the conventional deterministic method in shallow water depths, enabling us to design a caisson more economically. On the other hand, the above-mentioned allowable limits of caisson sliding show similar results for smaller water depths, while, for larger depths, the former requires a larger cross-section than the latter.
Keywords
optimal design; sliding of caisson; expected total construction cost; discount rate;
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  • Reference
1 Alfageme, S.A., Headland, J.R. and Kotulak, P. (2000). Dike design optimization and reliability analysis. Proc. of Coast. Struc. `99, ASCE, 295-299
2 Hong, S.Y., Suh, K.D. and Kweon, H.M. (2004). Calculation of expected sliding distance of breakwater caisson considering variability in wave direction. Coast. Engrg. J., 46(1), 119-140   DOI   ScienceOn
3 Hussarts, M., Vrijling, J.K., Van Gelder, P., de Looff, H. and Blonk,C. (2000). The probabilistic optimization of revetment on the dikes along Frisian coast. Proc. of Coast. Struc. '99, ASCE, 325-329
4 Shimosako, K. and Takahashi, S. (1999). Application of deformation-based reliability design for coastal structures. Proc. of Coast. Struc. '99, ASCE, 363-371
5 Voortman, H.G., Kuijper, H.K.T. and Vrijling, J.K. (1998). Economic optimal design of vertical breakwaters. Proc. 26th Int. Conf. Coast. Engrg., ASCE, 2124-2137
6 星谷 勝, 石井 淸 (1986). 構造物の信賴性設計法. 鹿島出版會
7 Goda, Y. (2001). Performance-based design of caisson breakwaters with new approach to extreme wave statistics. Coast. Engrg. J., 43(4), 289-316   DOI   ScienceOn
8 이철응 (2002). 기대 총 건설비 최소화 기법에 의한 혼성제 직립 케이슨의 설계. 대한토목학회논문집, 22(6-B), 819-831
9 Goda, Y. and Takagi, H. (2000). A reliability design method of caisson breakwaters with optimal wave heights. Coast. Engrg. J., 42(4), 357-387
10 Shimosako, K. and Takahashi, S. (1998). Reliability design of composite break Water using expected sliding distance. Rep. of the Port and Harb. Res. Inst., 37(3), 3-30(in Japanese)
11 권혁미 (2004). 대도시 아스팔트 포장공법에 대한 LCC분석 모델 개발 및 VE평가에 관한 연구. 석사학위 논문, 한양대학교