1. I.I- Introduction i- Loading a- Types of dynamic loading Loading
Structure
Response
1- Analyzing structures under dynamic loading
2-Codes and beyond
i- Loading
a- Types of dynamic loading
1-Periodic (repetitive loading) such as rotating machinery in a building
2-Non-Periodic such as blast, earthquake, and wind

2. b- Characteristics of a dynamic loading
1-No single solution (function in time)

3. ii- Structure b- Characteristics of a dynamic loading (cont’d)
2-Inertia loads are developed in dynamic loading ONLY
ii- Structure
a- Structure modeling

4. iii- Response b- Degree of freedom
1-The number of independent displacement required to define the displacement position of all the masses relative to their original position
iii- Response

5. a- Damping b- Sources of damping
Process by which vibration steadily diminishes in amplitude.
b- Sources of damping
1-Friction
2-Opening and closing of micro cracks
3-Impact and energy radiation, etc.
It is almost impossible to identify mathematically each energy dissipating mechanisms in an actual building. We may represent all damping by a single idealized equivalent viscous damping

6. c- Static force
d- Equivalent stiffness