ABSTRACT
Immersed tunnel structures are designed to limit state design principles in the same way as any other modern piece of transportation infrastructure. In many respects, the structural design is not unusual, albeit some of the applied loadings may be. This chapter describes the process for designing a tunnel with the necessary characteristics to be floated and immersed. It also describes the loads that should be considered in the design of an immersed tunnel-in particular, the unusual loads that are specific to the circumstances of an immersed tunnel-and the methods for the analysis and design of the structure for its temporary and permanent condition. Some noncodified aspects of design are also described.
