structures and forces

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structures and forces

1. structures

1.1. form

1.1.1. the form of the structure is very important because the form of the structure makes the structure special like making it into a plane shape to fly.

1.1.2. Eiffel tower

1.1.3. london tower bridge

1.2. function

1.2.1. the function is important because the function of the structure will decide the form of the structure and how it would be built for the specific function it has.

1.2.2. plane

1.2.3. watermill

2. types of structures

2.1. frame structure

2.1.1. spider web

2.1.2. a structure made of different components combined into one structure

2.1.3. umbrella frame

2.2. shell structure

2.2.1. dome

2.2.2. helmet

2.2.3. definition:a shell structure is a very strong structure that is very strong but is hollow in the inside of the structure

2.3. solid structure

2.3.1. a solid structure is a structure solid all the way through it is also always heavier than a shell structure

2.3.2. sandcastle

2.3.3. candle

2.4. combination structure

2.4.1. a combination structure is a combination of shell, frame, or solid structure used in one structure

2.4.2. house

2.4.3. glasses

3. golden gate bridge in San Fransisco

3.1. purpose, form, and function

3.1.1. the form of the bridge is a straight bridge but with arcs and wires on top of the bridge for structural support

3.1.2. the purpose of the bridge is for cars to cross the bridge to get to Marin country Calif

3.1.3. the function is to hold a lot of weight, lots of cars, without the bridge snapping it is supposed to be able to carry 4200 tons and max. of 22500 tons.

3.2. type of structure:

3.2.1. it is a frame structure since it is an entire frame with very strong metal, it is quite strong since they make a lot of triangles which makes the bridge very strong.

3.3. two types of external forces

3.3.1. one type is point of application. the point of application is the top of the bridge since all the cars drive on top of the bridge causing a lot of force on the bridge.

3.3.2. the second external force is the direction force which is a push since the cars are pushing downwards on the bridge with its own weight

3.4. center of gravity

3.4.1. center of gravity on this bridge is low, it gives the bridge more stability and more strength, this is impotent to the structure because it holds the weight, so the cars on the bridge can pass safely.

3.5. internal and forces

3.5.1. the internal forces acting on this bridge might be torsion, because the wind will push against the bridge, the point of application might be on the top, the plane of application might be 90 degree, and the direction will be a pull, and if there are only cars on the others side, it will cause the twist, the other internal force might be a tension, because the car's weight on the bridge, causing the wires on the bridge to stretch out

3.6.1. the dead loads on this bridge is the mass of the bridge it self, the live load on this structure will be the cars on the bridge that is on top of it, the dynamic load might be the wind pushing against the bridge.

3.6.2. the live load on this structure is the cars that are traveling on it, the cars gives more weight to the bridge so it is a live load.

3.6.3. the dynamic load on is bridge might be the wind, the wind blows against the bridge causing it to rock forwards and back.