Tension: the pulling force: Tension in structures is a ... - Mechatronics

plantcalicobeansUrban and Civil

Nov 29, 2013 (3 years and 6 months ago)

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Strength

Definition
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Tension: the pulling force:
Tension in structures is a pulling force. It stretches materials. Link
your hands together and pull. You feel tension. Stretch a rubber band. You see tension in
action. The rubber stretches, and th
e band gets longer. Examples of materials in tension: rope
bridges, suspension bridges, telephone wires, tents, steel cables supporting an elevator, and your
hair when someone pulls on it.


Compression: the pushing force:
Compression is a pushing force. It squashes materials. Put
your hands together and push hard. You feel compression. Put a marshmallow on the counter and
push it down with your hand. As you push,
the marshmallow gets shorter. It is in compression.
Examples of materials in compression: pyramids, telephone poles, arch bridges, elephant legs,
tree trunks, and your little brother when you sit on him.


Different parts of a structure are either in tensi
on, or in compression, or both. Therefore, the
materials we use to build structures must be strong in tension, in compression, or both.


Load:

All structures have to stand up to the loads placed on them.


Live Load:
Live loads are the things a structure

supports through regular use. These loads can
change and move. Live Loads include snow, rain, people, cars, wind, etc.


Dead Load:
Dead loads do not move. The structure always has to support them. Dead Loads
include walls, beams, arches, floors, and
ceilings.