A short, accessible introduction to structural dynamics, this book covers linear analysis of single (SDOF) and multi-degree-of-freedom (MDOF) systems, under free vibration and in response to a variety of forcing functions. It touches on hand analysis of continuous systems to illustrate key principles and discusses methods of calculation of non-linear dynamic response. Lastly, it presents the key principles of random vibration analysis ¿ this approach is crucial for wind engineering and is increasingly important for other load cases.