Studying structures

In technology class we are studying structures and we are doing the lesson summary. In the workshop we are starting a new project called lifting bridge.
In this project we are working in groups of threes, this project is gonna take five weeks to be done.
The body structure is a group of pieces that have a mision to support, to protect and to give consistence to the others parts.
Elements in the structures:
Pillars.
Beams.
Suspenders.
Square.