Trial Design of Floating Airport for Next Generation SST

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When construction of the next generation SST is discussed in Japan, it is natural to conclude that it will be installed at the sea because of necessity of very large area, and also due to noise and environmental problems. Therefore, in this report, a large scale floating airport is designed, which is expected to handle 70 million passengers/year and to have superiority in economy, safety and reliability on navigation and passenger controls. This airport is planned to be constructed at the sea whose water depth is 20^-30m off Kuju-Kuri coast and to be managed in combination with existing Narita Airport. Both airports are connected by a high speed railway, a drive way and an airway using VTOLs. The floating airport is also connected by a fixed bridge with land. When these transportation systems are adopted, SST airport will play a role of so called gate airport and Narita airport will play a role of so called hub airport for flying to a number of cities in North-East Asia area. This floating airport consistts of a large scale burge as terminal and apron and four very long semisubmersibles as runways. The burge was analyzed as a rigid floating body supported by two kinds of reclamated artificial islands installed at offshore and nearshore sides, while the runways were analyzed as elastic beams supported at midspan point and at terminal point. In this way, an new design of the next generation SST was shown. In order to make the design more accurate from structural engineering aspect, lift force due to wind was experimentally studied under the condition of simultaneous existence of high waves. Some important informations on evaluation of lift force and on the effects on the design were induced from these experiments. Moreover, foundamental analyzes were made on behaviors of floating airport when airplane is landing.