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# Structures

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### Transcript

• 1. STRUCTURES
• 2. A structure is a group of elements somehow united to support a load with stability
• There are 6 types of structures.
• 3. Frame Structures
• 4. Shell Structures
• 5. Arch
• 6. Mix and Match
• 7. Mass Structures
• 8. Suspension Structures
• 9. FRAME STRUCTURES
• Is the most common choice of structure.
• 10. These structures are composed of long elements joined to each other at the ends.
• 11. SHELL STRUCTURES
• Shell structures are made out of a thin outer layer of material that surrounds a volume.
• 12. That volume can be empty space or can be filled with something that has no structural relevance.
• 13. ARCH
• There are many types,but the semicircular Arch,which was the Roman arch,still remains the most used.
• 14. In Roman times,they were made of stone.
• 15. Romans invented it.
• 16. MIX AND MATCH
• The combination of structures make more complex structure,this structures are called Mix&Match structures.
• 17. MASS STRUCTURES
• They are made of clump material,filling the body completely.
• 18. The structure is normally thick.
• 19. They can be made by piling up materials into a shape or design.
• 20. SUSPENSION STRUCTURES
• A suspension structure holds an element(often a beam) by cables that are held from the top of a tall column.
• 21. The distance between one column and the next is calld the span.
• 22. Structural elements can be defined by “the simplest part of the whole”.
• The foundation is an element joined to the ground by friction.The foundation is also joined to the column by friction.
• 23. The column is another element joined to the foundation and to the primary beams.
• The beams and the column are joined by welding if they are metallic.
• 24. Is some cases the beam can be laid on the column (Held by gravity.)
• 25. All structural elements must be somehow united to the other elements.
• Permanent unions are meant for structures that will not need to be dissasembled.
• 26. Examples : Rivets,welding,glue...
• Non-Permanent Unions are those designed to assemble and dissasemble the elements of the structureas many times as necessary
• 27. Examples : Nuts and bolts,clamps,friction...
• 28. TENSIONAL AND COMPRESSION
• Is the strain that causes an element to stretch.It can be due to forces that pull an element from its ends
• They are those forces which cause an element to get squeezed or buckled.
• 29. SHEAR AND TORSION
• Shear forces act across a material in such a way that they can force one part of an element to slide over another.
• If you apply a turning force (Called “torque”) at one end of an element and,if the element is fixed to a support at the other end,the element twists.
• 30. BENDING FORCES
• Bending forces act at an angle
• 31. to a member (AT 90º from the axis line),
• 32. making it bend.
• 33. THE END Laura Aparicio Recio & María Megías Teijón