Dynamic responses of a submerged floating tunnel in survival wave and seismic excitations
Additional Document Info
Copyright 2017 by the International Society of Offshore and Polar Engineers (ISOPE). This paper presents the dynamic response/global performance of two types of submerged floating tunnels (SFTs) under survival wave and seismic conditions. Time domain numerical simulations are performed by the commercial program, OrcaFlex. Three buoyancy to weight ratios (BWRs) are considered as a design parameter. Two different configurations of mooring lines are considered to find a better solution to minimize dynamic responses of the SFTs in the extreme conditions. The floating tunnels are considered as a long/slender elastic cylindrical body clamped at both ends. Not only elastic responses including sway/heave motions at the mid span but also mooring tensions are evaluated and assessed. Modal analysis is performed to obtain the natural frequencies and mode shapes for different BWRs and mooring configurations.