Types of Structures
This structure is made of connected parts like a skeleton.
What is a FRAME structure?
The stability of a structure depends mostly on this; it is the point where a structure’s weight is balanced.
What is CENTRE OF GRAVITY?
This type of load does not move.
Which of the following describes the size or strength of a force...
- Direction
- Magnitude
- Point of Application
- Friction
What is MAGNITUDE?
This design feature helps spread forces evenly.
A turtle shell is this type of structure.
What is a SHELL structure?
This factor improves stability the most.
What is a WIDE BASE?
A person standing still creates this type of load.
What is a STATIC LOAD?
This word describes the way in which a force acts
What is DIRECTION?
TRIPLE POINTS!
Why does a wide base increase stability?
It keeps the centre of gravity inside base
DOUBLE POINTS!
What is it called when a structure uses more than one classification?
What is a COMBINATION structure?
A structure is most stable when its centre of gravity is this.
What is low and centered?
A car moving on a bridge would be an example of this type of load.
What is a DYNAMIC LOAD?
This is the surface or area where a force is applied.
What is POINT OF APPLICATION?
Why are bridges often symmetrical?
There is an even force distribution and more stability
This type of structure is also called a mass structure and is usually made of strong materials.
What is a SOLID structure?
What happens when the centre of gravity moves outside the base?
What is the structure will TIP or FALL OVER?
This force resists motion between surfaces.
Gravity is an example of an __________ force
EXTERNAL
A structure becomes less stable when it increases in ___________.
height
A bicycle is a good example of this type of structure
What is a FRAME structure?
This is the exact spot where the force meets the structure.
What is the point/plane of application?
Double Points!
These four are types of internal forces.
What is COMPRESSION, TORSION, TENSION, SHEAR?
Too heavy of a ______ can cause structures to fail.
load
The leaning tower is Pisa is a popular tourist site in Italy and a very tall structure. Imagine if the structure did not have any support cables. Explain why the tower would likely fall over using a concept from the unit.
Its center of gravity moves outside its base, making it unstable and causing it to tip over.