Structures
- 1. Structures What can you see here?
- 2. IDENTIFICATION EXERCISE Can you identify the following structures?
- 3. IDENTIFICATION EXERCISE 1. Match each building with the corresponding fact and country. 2. Differentiate between the present and past tense. Building Eiffel tower Taj Mahal Statue of Liberty Big Ben Guggenheim Bilbao Facts It was a present from France. It was made for the Universal Exposition of 1889. It is the largest four-faced chiming clock in the world. It was built as a masoleum. It is covered in titanium panels. Country Spain France U.S.A United Kingdom India
- 4. STRUCTURES Why do we need bridges? Could you think of other kinds of structures? Do you see any structures in the class? Could you think of any structures that you use every day?
- 5. DEFINITION OF STRUCTURE A structure is a group of elements that can support weights without breaking or deforming.
- 6. PROPERTIES OF A STRUCTURE RIGIDITY -A structure maintains its form STABILITY -A structure cannot turn over. RESISTENCE -A structure doesn't break easily.
- 7. Types of structures We can find different kinds of structures in our surroudings. Structures created by nature are called natural structures . E.g: Skeletons, rock formations, shells of an animal
- 8. Types of structures Others have been designed and built by man to meet their needs during their evolution. These man-made structures are called artificial structures . The most common examples of such structures are bridges and buildings.
- 9. STRUCTURAL ELEMENTS Column - A column is a vertical element that has to support the weight of a structure. It transfers weight to the ground. GRAMMAR REVIEW -When do you use have to ?
- 10. STRUCTURAL ELEMENTS Beam- A beam is a horizontal element that has to support the weight of a structure. It transfers weight to a column.
- 11. STRUCTURAL ELEMENTS Brace- A brace is an element that improves the rigidity of a structure.
- 12. STRUCTURAL ELEMENTS Arch- An arch is an element that transfers weight to other structural elements, like columns and beams.
- 13. Forces in Structures A structure must be able to support, besides its own wheight, other forces and external loads acting on them. http://www.galileo.org/tips/structures/forces.html These forces are: Tension Compression Flexion Torsion Shear
- 14. TENSION FORCES Forces which cause a member to "stretch".
- 15. Compression Forces Forces than can cause a member to be "squashed".