This book addresses the topic of structural dynamics, which is a branch of structural analysis devoted to the behavior of structures subjected to dynamic loads, from a theoretical and algorithmic approach. Dynamic loads can originate from many sources, including loading caused by geophysical phenomena such as wind, waves or earthquakes, or manmade sources such as traffic, explosive blasts, or other impacts. The book covers systems with both single and multiple degrees-of-freedom, and numerous case studies are provided to give the reader a deeper insight into the real-world practicalities and constraints of the field. Solutions to these case studies are given in terms of real-time and frequency in both geometric and modal spaces. Emphasis is given to the subject of seismic loading, which makes the book especially important and relevant to mechanical, structural and civil engineers working with these loads in mind.