I.I- Introduction i- Loading a- Types of dynamic loading Loading

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Presentation transcript:

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

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

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

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

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

c- Static force d- Equivalent stiffness