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# Copy of 1 - Forces Acting on Structures and Mechanisms: Forces Acting on a Structure

Examination of forces acting on a structure - gravity, wind, load/mass, and compression/pressure, activity
by

## Amy Longden

on 28 March 2015

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#### Transcript of Copy of 1 - Forces Acting on Structures and Mechanisms: Forces Acting on a Structure

Forces Acting
on a
Structure

A structure is anything made of parts
put together for a specific purpose.
What is a Structure?
What forces act on structures?
A load refers to a force acting on a structure. The mass/weight that is placed upon a structure
Example: a pile of books (load) is a force acting
upon the shelf (structure)
Compression (Pressure)
Compression is an internal force that occurs within the structure that presses or squeezes the particles of an object together (usually temporarily)
Example: the shelf (structure) bearing the books is
under compression - the mass of the books
A load not caused by gravity. Examples are moving water and high winds
Gravity
The natural force of attraction exerted by the Earth upon objects at or near its surface, tending to draw them toward the center of the Earth.
Function: The task or purpose of the structure
Form: The shape and appearance of a structure
Live Load is the weight of the objects a structure supports
External Forces
Tension
An internal force pulling the particles of an
object apart
Example: The cables of a suspension
bridge.
Torsion
Internal twisting forces
created in an object as a result
of an applied twisting
Example: Strong winds
twisting one end
of a bridge
Shear
Forces acting in an object as
a result of pushes and pulls
in opposite directions
Example: Scissors use shear
force to cut
Internal Forces
Force: A push or
pull
Forces that push or pull objects when the objects come in contact are called applied forces
Forces have magnitude and direction
Full transcript