independent-type structure with a circular cross section and in case of the independent-type/moored-type structures with a rectangular cross section.
4) Comparing the experimental values with the theoretical values, both the values are in relatively good agreement with each other although slight deviation is noticed.
6. CONCLUSIONS
In concluding this paper, it is comprehended that the soft-settled-type offshore structures with a circular cross section are slightly inferior in their freedom from seismicity to the ones with a rectangular cross section. However in a region where water depth is deep enough and frequency is high, the difference between both the structures is extremely small. From this it can be said that the freedom from seismicity is very high compared with settled-type structures.
Note: Details are shown in Ref.11.
REFERENCES
1)Sakuta,M.,Kouda,K.,Tanaka,K.,et al. :A fundamental study on setting method of offshore structure (part1), Summaries of Technical Papers of Annual Meeting, Architectural Institute of Japan (AIJ), 2314,Sept.1980 (in Japanese)
2)Sakuta,M.,Kouda,K.,Shingu,K.,et al. :A studyon responses of a soft-settled-type offshore structure(part1), Summaries of Technical Papers of Annual Meeting, AIJ,10045, Oct.1989 (in Japanese)
3)Shingu,K., Funamoto,D., Sakuta,M. :Responses of a soft-settled-type offshore structure subjected to seismic forces, Proceedings of the Fourth Pacific Congress on Marine Science and Technology (PACON 90),Tokyo, Japan, Vol.2, July, 1990
4)Shingu,K., Funamoto,D., Sakuta,M. :A study on responses of a soft-settled-type offshore structure --independent circular cylinder--,IEEE Oceans Proceedings (Oceans 91) Hawaii, USA, Vol.2, Oct. 1991
5)Shingu,K., Ohkubo,N., Sakuta,M. :A study on responses of a soft-settled-type offshore structure(part8), Summaries of Technical Papers of Annual Meeting, AIJ,10029, Sept.1993 (in Japanese)
6)Shingu,K., Ohkubo,N., Sakuta ,M. :A fundamental study on responses of a soft-settled-type offshore structure, Journal of Coastal Eng., Japan Society of Civil Eng. ,Vol.40,Nov.1993 (in Japanese)
7)Ohkubo,N. ,Shingu,K. ,Sakuta,M. :A study on responses of a soft-settled-type offshore structure(part9), Summaries of Technical Papers of Annual Meeting, AIJ,10016, Sept.1994 (in Japanese)
8)Kobayashi,M. ,Shingu,K. ,Sakuta,M. :A study on responses of a soft-settled-type offshore structure(part10), Summaries of Technical Papers of Annual Meeting, AIJ,10001, Aug.1995 (in Japanese)
9)Saunders, H.E.: Hydrodynamics in ship design, SNAME, 195710)Ohkubo,N.: A Fundamental study on a soft-settled-type offshore structure, Master's Thesis, Nihon Univ., March. 1994 (in Japanese)
1 1)Shingu,K. ,Sakuta,M. : Dynamic Response Characteristics of a Soft-settled-type Offshore Structure --Moored-type structure with a circular cross section--,THEORETICAL AND APPLIED MECHANICS,Vol.45, 1996 (in press)
