The Development of Submerged Floating Tunnels as an innovative solution for waterway crossings
Martire, Giulio (2010) The Development of Submerged Floating Tunnels as an innovative solution for waterway crossings. [Tesi di dottorato] (Inedito)
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The present Thesis is organized in 10 chapters. In particular Chapter 1 gives a general overview of the modern solutions and technologies available in the field of waterway crossings, introducing briefly the revolutionary concept of Submerged Floating Tunnel. Chapter 2 provides a deeper insight into the main characteristics of this innovative structural solution for waterway crossings: first its structural features are described and the relevant loading conditions discussed, subsequently the main advantages of the SFT with respect to the traditional crossing solutions, such as the Cable Supported Bridges and the Underground and Immersed Tunnel are described. Chapter 3 traces the history of the SFT, starting from its first proposal made in 1969 for the Messina Strait crossing, describing all the feasibility studies and preliminary designs developed all over the world in the following years. This Chapter is concluded by a description of the Sino-Italian cooperation programmes, involving among the other partners the University of Naples “Federico II”, which led to a feasibility study relative to the crossing of the Jintang Strait (P.R. of China) with a SFT and to the complete design of the first SFT full-scale prototype, planned to be realized in the forthcoming years in the Qiandao Lake (P.R. of China). A potential SFT crossing in the Pulau Seribu Archipelago (Indonesia), preliminary studied in the last years by the research team headed by Prof. Mazzolani, is also briefly illustrated. Chapter 4 explains in the detail of the various aspects faced in the design of the Archimedes Bridge prototype. The features of the selected location and the structural scheme are illustrated. The structural analyses aimed at investigating the prototype behaviour under the environmental loads are discussed. The conception and the design of the constructional details are presented. Finally, the fabrication and erection procedures are briefly described. Chapter 5 provides a description of the structural models which can be used to analyse the SFT structural behaviour: the beam on elastic foundation, which 2 Outline of the Thesis can be used in the preliminary phase of the design, and a SFT Finite Element Model. Chapters 6 and 7 are devoted to the study of the response of the SFT to the main environmental loads to which is subjected: the hydrodynamic actions due to the presence of waves and currents and the earthquakes. Numerical analyses are carried out with the Finite Element analyses aimed at the understanding of the SFT structural behaviour and at the definition of the optimal structural configurations. In Chapter 8 potential SFT solutions developed for the Messina Strait and Gibraltar Strait crossings are illustrated and a technical-economical comparison with the Suspension Bridges designed for the same locations is made. Chapter 8 describes a simple procedure for a quick comparison of the SFT and CSIB solutions with the Cable Supported Bridges one, providing useful curves highlighting the conditions under which the former ones are more competitive than the latter ones. Finally, in Chapter 9 the future steps and challenges to be faced in the development of Submerged Floating Tunnel are presented. An alternative typology of floating tunnel is introduced too: the Cable Supported Immersed Inversed Bridge (CSIB), which is conceived as a combination of the submerged floating bridge concept with the cable system configurations and features several advantages also with respect to the “traditional” SFT solution.
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