Structures can be either natural or man-made and serve several purposes like enclosing spaces, spanning gaps, and supporting loads. They are composed of parts held together that experience various forces like tension, compression, bending, torsion, and shearing. Common structure types include frame, shell, and solid structures, with frames using beams connected to support loads. Triangulation adds extra members to structures to form triangles that increase stability.

1. Educator: Mondlane.J

2. Unit 1 understanding
structures
Definition of and purpose of structure
 Structure is something that consist of many parts held together in a
specific way.
Classification of structure
 Natural structure
 Man-made structure
Man-made structure-is structure that have made by human being is also
known as artificial structure.eg Bridge, stadium, traditional hurt ,
birdcage and aeroplane
Natural structureNatural structure is structure that have no human interference.eg nest,
snail and tortoise.
Purpose of structure.
 To enclose and protect
 To span a gap
 To support a load

3. Purpose of structures
 Structures are build to support load is static( not moving or
dynamic moving)
 Parts in structure support tensile (pulling) or compressive
(pushing) force.
Types of structures
 Frame structures
 Shell structures
 Solid structures
Frame structures are made from beams connected to each other
to support a load. eg skeleton
Shell structures have a solid outer surface, like the skin covering
your body (enclose something) eg snail shell.
Solid structures are rigid and heavy. e.g. mountain

4. Triangulation
 Triangulation – is when an extra member is added to rectangle to form two
triangle
 Struts: as rod or bars forming part of a framework that are designed to resist
compression.
 Tie: a rod or bar that resists pulling or tension

5. Summary
 Stability is the state or condition of being steady and unlikely to change, fall or
move.
 Stiffening is the process of adding strength and form to sheet materials.

Tubing and corrugation are two method used to stiffen materials
 Corrugation is used to shape a sheet of materials into folds to form alternating
ridges and grooves.
 Tension forces stretch, bending forces bend
 Torsion forces twist
 Shearing force caused two surfaces to slide against each other.
 Beams that resist compression (pushing force) are called struts.
 Beams that support pulling force are called ties.

6. Summary
 Stability is the state or condition of being steady and unlikely to change, fall or
move.
 Stiffening is the process of adding strength and form to sheet materials.

Tubing and corrugation are two method used to stiffen materials
 Corrugation is used to shape a sheet of materials into folds to form alternating
ridges and grooves.
 Tension forces stretch, bending forces bend
 Torsion forces twist
 Shearing force caused two surfaces to slide against each other.
 Beams that resist compression (pushing force) are called struts.
 Beams that support pulling force are called ties.