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Bridges

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Bridges

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  1. Bridges By: Alaa, Dustin, Kamran, and Maggie

  2. Importance • Necessary to daily life • Makes for easy transportation over water or valleys • Makes land travel faster and more efficient

  3. History • Bridges have been around since before the first century A.D. • A main use was to move water to where it was needed though aqueducts

  4. History • In the late 1700’s cast iron was innovated into bridges. • With the innovation of steel mills came stronger and longer bridges, such as the suspension bridge

  5. Types of Bridges • Arch Bridges • Beam Bridges • Suspension Bridges • Truss Bridges

  6. Arch Bridges • One of the oldest types of bridges • The weight of the bridge is carried out along the curve of the arch • This support takes the load and keeps the ends from flatting out • Mostly constructed from stone or brick

  7. Beam Bridges • Consists of a horizontal beam • Made from almost anything; wood, stone, steel, ect. • Supported at each end by piers • Weight of the beam pushes down on the piers, without them the bridge would sink into the ground

  8. Suspension Bridges • Suspended roadway by cables, sometimes spanning the length of the bridge • Cables rest on top of towers, this enables the main cable to be draped over long distances • Must be constantly maintenance to perform properly

  9. Truss Bridges • A beam bridge with two sides that extend to the top and or bottom are the trusses • Hold the weight of the bridge in the truss • Most common design of truss or the interior of a truss is triangles

  10. Active Forces • Tension- The state of being stretched • Torsion- To twist in opposing directions • Compression- To push together • Shear- Two objects to slide past one another in opposing directions

  11. Triangles • One of the most stabilizing force in architecture • If weight is applied onto a triangle the pressure due to compression is distributed evenly • Only if a side of the triangle is compromised will the triangle fail and break • They are used in bridges, buildings and towers

  12. Rigidity • When a triangle is added to a structure it becomes more rigid • When a structure is more rigid it can be made longer and bigger

  13. Engineering • To engineer a bridge theorems and postulates are used • If a triangle did not add up to 180 in a truss then the truss would have no support

  14. No Geometry? • Without geometry life would be very basic • There would be no large bridges, planes, trains, cars or other forms of transportation • Buildings would not be more than a story tall