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Offshore structures are unique in the field of engineering, as they pose many challenges in the development and conceptualization of design. As innovative platform geometries are envisaged to alleviate the encountered environmental loads efficiently, detailed understanding of their analysis and basic design becomes important. Structural dynamics, being an important domain of offshore engineering. require intensive teaching and guidance to illustrate the fundamental concepts, in particular as applied to ocean structures. With the vast experience of teaching this subject and guiding research, a humble attempt is made to present the basics in a closed form, which will be useful for graduate students and researchers. Chapters in this book are organized such that the reader gets an overall idea of various types of offshore plants, basic engineering requirements, fundamentals of structural dynamics and their applications to preliminary design. Numerical examples and application problems are chosen to illustrate the use of experimental, numerical and analytical studies in the design and development of new structural form for deep-water oil exploration. This book is an effort in the direction of capacity building of practicing and consulting offshore structural engineers who need to understand the basic concepts of dynamic analysis of offshore structures through a simple and straightforward approach.