DEFINITION OF STRUCTURE
Blocks, rods or sheets of different materials arranged in such a way that they can bear without breaking the followings forces:
- Internal forces like their own weight.
- External forces like wind, rain, loads, etc.
TYPES OF STRUCTURES
- Massive structure: it is made of blocks of material: For example a Roman aqueduct, an ancient bridge made of stone, etc.
- Laminated structure or shell structure: it is made of plates or sheets of material (e.g. a pencil case is made of sheets of wood).
- Framework structure: it is made of rods (sticks or strings) combined in different ways, following different patterns.
> Triangulated framework structure: is the strongest structure and it is made of groups of three rods joined in triangles.
Types of rods
Beam: it is a rod which bears flexion forces (e.g. a diving board).
Tie: it is a rod which bears tensile forces (e.g. the string which hold the ceiling lamp).
Strut: it is a rod which bears compressive forces (e.g. the legs of your table).
Axle or shaft (eix en català): it is a rod which bears torsion forces (e.g. a drill or screwdriver) or shear forces (e.g. the part of a beam between the wall and the air).
Examples of structures
WHAT MAKES BRIDGES SO STRONG?