equilibrium

equilibrium - Equilibrium 12-100 Introduction to Civil and...

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Equilibrium 12-100 Introduction to Civil and Environmental Engineering Fall 1999
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Outline • Free Body Diagrams • Supports and Reaction Forces • Equilibrium (Newton ’s Laws) • Applying Equilibrium Equations • Statically Determinate Reactions • Examples
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Free Body Diagrams (FBDs) • Sketch representing a body and forces acting on it. • Isolates things of interest. • FBDs are a must for every statics problem being solved • First thing you do is draw an FBD
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FBDs for Supports 1. Body on an inclined plane W R 2. Weight on a chain or rope W R
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FBD B C A A R AB R AC W A B R BC R BX R BY C R CX R CY R BC R AB , R AC and W A are concurrent W C W B
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R 1 R 1 R 2 R 1 R 2 M Supports and Reaction Forces • Pin • Roller • Fixed
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Pin Roller
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Complex FBD Example
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Complex FBD Example Car wheel loads support reaction fixed end reactions Loads from hanging pipe Load from blower Dead load from deck Dead load from beam
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Equilibrium • Newton ’s Laws: • First Law: A particle continues to move in a straight line or remains at rest if there is no unbalanced force • Second Law: The acceleration of a particle is proportional to the force acting on it.
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This note was uploaded on 12/15/2010 for the course EE 111 taught by Professor Jamil during the Fall '99 term at NUCES.

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equilibrium - Equilibrium 12-100 Introduction to Civil and...

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