Presenting a comprehensive overview of recent developments, this book explores the latest progress in both theoretical and experimental research. The book distills the findings of scientists and researchers into practical methods, providing a complete framework of the most recent trends. It emphasizes the utilization of multiple level design, the differentiation of earthquake types between near-field and far-field, the analysis of all factors influencing the steel structure behavior during a strong ground motion, and the evaluation of the ductility erosion due to unexpected conditions. The book also presents an analysis of innovative seismic protection techniques utilizing passive and active control devices.