Estimation of Proper External Loadings Before designing an ORS, a dynamic analysis of wind, wave and current forces is necessary to estimate the maximum load. To achieve this, development of an analytical model and study by a hydraulic model and wind tunnel model are necessary. Prior to the study of the external load estimation, a field survey at the site is an absolute necessity to grasp the existing environmental conditions. Joints To keep the entire ORS as a stable and well organized structural system, effective joints such as damper joint, universal joint, stiff joint, etc., must be developed and used at the appropriate connections. Construction As the construction period is expected to be long, extreme environmental conditions such as typhoon and tsunami are possible. To cope with these circumstances, an emergent safety system has to be established. Further, an effective construction method to shorten the period of field work is a keen issue to be solved. REFERENCES 1. K. Kikutake, Study on necessity and possibility of new residential space in large city area; see also Artificial floating ground, Kikutake Architect and Associates, Tokyo, 1977. 2. J.P. Craven and J.A. Hanson, Hawaii's Floating City Development Program, First Ann. Rep. Fiscal Year 1972, Univ, of Hawaii/Oceanic Institute, 1972.
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