This book introduces the fundamental properties and practical applications of iron-based shape memory alloys (Fe-SMAs) from the perspective of seismic engineering. It objectively discusses the superiority of this novel class of materials that could potentially address the limitations of the existing seismic control technology. The results, vividly presented as tables and figures, are demonstrated with religious experimental verifications supplemented by comprehensive numerical investigations. From the knowledge provided, the readers will gain an in-depth understanding of the working mechanisms of various Fe-SMA-based structural devices and members, including braces, dampers, steel connections, base isolators, and concrete components, and as a result they will be provided with a broader vision of next-generation performance-based seismic design for novel adaptive structural systems. The book aims to help bridge the gap between materials science and structural engineering fronts, and to shed light on the opportunity of commercializing Fe-SMA products in construction industry. The cutting-edge research introduced in this book will also provide technical incentives to encourage design professionals, contractors, and building officials to use high performance and smart materials in structural design, allowing them to remain at the forefront of construction technology.1. The fundamental thermal-mechanical properties, especially the ultra-low cycle fatigue (ULCF) mechanism of Fe-SMA, will be first revealed. 2. Modelling techniques for Fe-SMA material and elements will be first discussed.3. Appropriate welding technology for Fe-SMA elements will be first