Seismic Analysis and Design of Ocean and Underground Structures

This Reprint, titled "Seismic Analysis and Design of Ocean and Underground Structures", presents a curated collection of high-quality research papers addressing the dual challenges of seismic safety in deep marine and complex underground environments. The Reprint explores four primary thematic areas. First, it highlights advanced numerical simulation methods, specifically focusing on complex fluid-structure interaction (FSI) problems. A notable contribution demonstrates the use of the coupled Eulerian-Lagrangian (CEL) method for analyzing submerged floating tunnels, providing a high-fidelity alternative to traditional methods. Other studies investigate sloshing modes in liquid-filled containers and FSI effects. Second, it addresses the structural design of marine-specific facilities, including modular artificial reefs and nuclear power intake tunnels situated on non-uniform soft soils. A significant portion of this Reprint is dedicated to the seismic resilience of underground structures. Extensive research is presented on the impact of weak interlayers and soft soil sites on subway station stability. These studies introduce and validate innovative seismic mitigation components, such as split columns, which significantly enhance structural ductility and reduce internal force compared to traditional designs. Finally, the collection covers lifeline maintenance and subsurface intelligence, examining the reinforcement of corroded steel pipelines with CFRP and advanced reflected wave extraction algorithms for borehole imaging.