Structures 1
What are the three types of structures?
shell, frame, solid
What is a shell structure?
uses an outside layer to provide support
What are the 2 types of forces?
internal & external
How many types of bridges are there?
4
A force is a ______ or ______
push, pull
What is a structure?
is something with a definite size, shape, purpose, and can hold a load
What is a frame structure?
rely on a framework arrangement that is made from parts that are connected together
What is an internal force?
a force that acts from within the structure
What are the types of bridges?
beam, truss, arch, suspension
What is gravity?
is the force that attracts a body toward the centre of the Earth
What is form?
the shape, size, and materials of a structure
What is a solid structure?
are made from one piece of solid material
What is an external force?
acts on an object or structure from outside the structure
Describe a beam bridge
Simple bridge
Horizontal bridge supported by piers
What is static load?
is a weight that does not change
What is function?
is a structure’s purpose or ability to do something
What is an example of a shell structure?
a glass jar, metal can, eggshell
What are 4 types of internal forces?
compression, tension, shear, torsion
Describe a suspension bridge
Cables suspended from towers to support the load
What is dynamic load?
is a force that can change when acting on a structure
What does FORM FOLLOWS FUNCTION mean?
states that the shape of a structure should primarily relate to its intended function or purpose
What is an example of a solid structure?
concrete dams & pyramids
What is an example of an external force?
wind, water, gravity
Describe a truss bridge
Similar to beam bridge
Has a brace that is made from triangles to provide extra support
What is the 90-90-90 rule?
Feet are flat on the ground
Knees at 90 degree angle
Back is upright at a 90 degree angle