1. Structures
1.1. soild
1.1.1. a structure that is strong and sturdy, and is mostly solid all the way through.
1.1.1.1. example
1.1.1.1.1. dam (human made)
1.1.1.1.2. it is a solid structure, because it is mostly solid all the way though. even though there are rooms in the dam, the weight of the solid part weighs more than the hollow structure of the same size and made of the same material. therefore it is a solid structure.
1.1.1.1.3. Mountain
1.1.1.1.4. it is a solid structure because the mountain is almost solid all the way through, and the solid part is more heavier than the hollow structure part of the same material and size
1.2. frame
1.2.1. a structure made out of columns and beams are put together to create the frame for the structure. this is often called structural components.
1.2.1.1. example
1.2.1.1.1. Car: it has a frame made out of metel. the frame is made out of columns and beams of metal, therefore making the car strong. and look like a car.
1.2.1.1.2. Human Skeleton: it is a frame because, it is strong and they are all connected together. It is made out of bones. That make a human skeleton very strong
1.3. shell
1.3.1. a structure that is strong and mostly hollow
1.3.1.1. example
1.3.1.1.1. igloo: it is a shell structure, because it is very strong, even though it uses very little materials in it's construction and is hollow. Also it is very light for it's size.
1.3.1.1.2. Egg carton: it is a shell structure, because it is also hollow and it is really light weight. that is when there is no egg in it. It is quite strong, considering how light is it.
1.4. combination
1.4.1. a structure made out if a combination of 2 or 3 of these types of structures.
1.4.1.1. example
1.4.1.1.1. A house: it is a combination of all three types. it has a shell, a frame, and solid parts. the frame is made out of wood, the shell that goes around the frame, and the solid parts are the nails bricks, etc.
1.4.1.1.2. a play ground is also a combination structure because it has a frame made out of plastic or wood and solid parts made out of plastic, wold, metal, etc.
2. Purpose
2.1. what it is made for
2.1.1. it could be made as a wall to block something or someone EX// a dam
2.1.2. it could be made for a shelter in case of a fallout....FALLOUT 4!!!!<--- GET THE GAME
3. Form
3.1. what the structure looks like and feels like.
3.1.1. it could be rough or smooth when you lay your fingers on it.
3.1.2. it could be very shinny and sparkly, or it could be plan with rust all over it.
4. Function
4.1. What the structure is used for
4.1.1. it could be used for transporting cars across a bridge. EX// bride.
4.1.2. it could be used for transporting people EX// car.
5. Forces
5.1. External forces: can be classified as, a static load and a dynamic load.
5.1.1. Dynamic Load
5.1.1.1. A force that moves or changes while acting on a structure.
5.1.1.1.1. Wind: is an unpredictable force that can change very rapidly. it could be weak or strong, or deadly.
5.1.1.1.2. Vehicle on a bridge: Is a dynamic load because, there could be very little cars on the bridge, non-rush hour, and then there could be a huge traffic jam on the bridge at rush hour. also cars go on and off at simultaneously therefore the weight on the bridge constantly changes.
5.1.2. Static load:
5.1.2.1. The affect of gravity on a structure
5.1.2.1.1. A person standing holding books: it is a static load because the the person is not moving and the books.
5.1.2.2. An elevator with people waiting inside: it is a static load because, the elevator is not moving and the people standing in the elevator is not moving.
5.2. Internal Forces
5.2.1. Internal forces can be classified as compression, tension, shear, and torsion.
5.2.1.1. Tension
5.2.1.1.1. Two people pulling a rope from the opposite ends: is tension because the rope is stretching as they pull it.
5.2.1.1.2. A force that stretches, expand or lengthen.
5.2.1.2. Torsion
5.2.1.2.1. A force that can twist.
5.2.1.3. Shear
5.2.1.3.1. A force that pushes together in opposite directions.
5.2.1.4. Compresion
5.2.1.4.1. A force that squeezes or presses something together.
6. Load
6.1. Live Load
6.1.1. A moving, variable weight added to the dead load
6.1.1.1. The people in a building: is a live load because people is moving inside the building.
6.1.1.2. A car: a car is a live load because, it is moving with weight.
6.2. Dead Load
6.2.1. A permanent load attached to a structure
6.2.1.1. Building: A building is a live load because it is permanent and it holds lots of weight.
6.2.1.2. The engine in a car: it is a dead load because, it is a load and is permanent on the car
7. Center Of Gravity
7.1. the center of mass. where the mass is equally balanced on both sides.
7.1.1. Example:
7.1.1.1. your body because, if you bend down your center of gravity shifts to your stomach. When you stand up your center of gravity shifts to your legs.
7.1.1.2. radio tower: the reason why a radio tower is able to stay up, and not fall over, it was a lower center of gravity. because there is more weight near the bottom