building

Building
People have built buildings since they came around. Take Stonehenge for example.
Most buildings have to fight against the forces of Gravity , Comprehension and Tension.
Gravity pulls buildings down . Comprehension squeezes buildings and Tension pulls buildings apart.
below i will tell you how buildings fight these forces  

Simple buildings
lets take the post and lintel for example.
the post and lintel is a very simple structure and you can see it in the 
Stonehenge. The post and lintel displaces the forces into its posts. The Post and lintel is two vertical posts with one horizontal beam placed on top . Another simple structure is the pyramid . It has a large base to hold all that wight on top of it . 

skyscrapers
skyscrapers are immensely tall. They have to fight the forces of Gravity , Comprehension and Tension. These forces are dissipated or spread over a wide area in the skyscraper. This area is the skeleton structure . Their is also a foundation where the forces can go.
bridges
bridges cross many things . Rivers, Chasms and  connect buildings . Bridges also have to fight against the three forces Gravity , Comprehension and Tension. There are three types of bridges

The Beam Bridge
the beam bridge is the simplest and weakest bridge .
It works a lot like the post and lintel. The logest
bridge in the world is a beam bridge in Louisiana
USA 

The Arched Bridge
the arched bridge is stronger than the Beam bridge
and more complicated. It dissipates the three forces
 Gravity , Comprehension and Tension .

The Suspension Bridge
the suspension bridge is the strongest of all three and most complicated.
it spreads out the three forces along cables that are attached to towers that are in the ground.
The strongest bridge covers more ground in one span then all the other bridges.
A span is the length between two piers that are in the ground. 

Architecture
there are lots of different ways to build buildings.
The people who design them are called architects.
Architects make sure every building they design
follows three basic rules. First the building has to
be structurally sound. Which means it will not be
destroyed by any natural disasters like earthqakes
and hurricanes. Second they make sure it is desi-
gned for the function it serves like if you were
building a fire house but you build a house instead
it would not serve its function. And last Aesthetics
to make sure it looks and fells good. If you want to
see some of my a architecture click here 


source: brainpop