Chapter 1 Introduction to Structural Dynamics1.1 Introduction1.1.1 Why Dynamic Analysis?61.2 Physical and Mathematical Modelling1.3 Discrete and Continuum Modelling1.4 Laws of Equilibrium1.4.1 Newton’s Law of Motion1.4.2 D’Alembert’s Principle1.4.3 Principle of Virtual Displacement1.5 Types of Dynamic Loading1.6 Solution of Equation of Motion1.7 Illustrative ExamplesProblems