STRUCTURES Flashcards
What is a structure?
Something that is BUILT, MADE or PUT TOGETHER in a particular way.
It can be STIFF, STABLE and STRONG and can SUPPORT loads.
Name types of Structures.
- Shell Structure
- Frame Structure
- Solid Structure
Discuss Shell Structure:
- Most containers (that hold something) are shell structures
- They are usually lighter that frame structures
- Strength of shell is on outside, eg. bag for rice, coffe mug
Explain Frame Structure
Is different parts joined together by joints.
Build in such a way that it makes the structure strong
What is a Solid Structure?
They do not have different parts with open spaces, like roks, bricks, cement poles
What are the purpose of a structure?
Give 2 examples at each purpose
- Contain - enclose or hold something
- Protect - shield or cover
- Support - hold or strengthen something
- Span a distance - arch spanning between pillars
How do we classify structures and explain/discuss with an example
Natural Structures:
Not made by people eg. caves, skeletons
Man-made Structures:
Made in workshops or factories eg. planes, tables, chairs
Name the following forces on Structures:
COMPRESSION:
A squashing force that compresses a structure
Name the following forces on structures:
TENSION:
A strecthing force on a structure
Name the following force on a tructure and explain:
TORSION:
A twisting force on a structure
What force is this and explain:
BENDING:
A bending force on s structure
Name this force on a structure and explain.
SHEARING:
Its a tearing force
Why do we need to strenghten structures?
There are always forces pushing (compression) and pulling (tension) on structures and they need to be able to withstand this
What is a push force?
A force used in the direction of the object - push
This power causes pressure
What is a pull force?
A force used away from the object - pulling
The power causes tension
How can we strengthen MATERIALS ? Discuss
Tubing / Struts:
- Has 3 shapes - Triangular, round, square
- Round tubing carry most weight - strongest
- Tubing can be used as a pillar to carry weight of building or bridge
Folding:
- Folding - by folding something it becomes thicker and stronger eg. corrugated paper (boxes) or corrugated iron (roofs)
How can we strengthen STRUCTURES?
By using or joining triangular shapes to strengthen structures, like:
- Struts
- Braces and Gussets
What is this and how does it work?
STRUTS:
A traingular is stronger than a square. Struts are used to strengthen the pole in a fence against the push and pull forces
What is this and how do we use this?
BRACES OR GUSSETS:
Small triangular shapes placed in corners of squares to strenghten a structure.
And so that the shape cannot change
