Bridging the FutureChoosing the Right BridgeSlide 3Slide 4What forces will the structure be subjected to?Slide 6Other FactorsCable-stay Bridge ActivityBridging the FutureDaniel SpakeSeptember 2, 2009Choosing the Right Bridge•Use the design process–What are the 8 steps in order?•4 types of bridges–Arch–Beam–Suspension–Cable-stayed•Of course, each bridge has advantages and disadvantages•In this chapter, the cable-stayed bridge was the best choice•To make this decision the engineers estimated loads that a new bridge would experience•Load-weight and forces a structure must support; 2 typesDead load- any load associated with the structure itself (beams, cables, road, etc.)Live load- loads that are not constant on the structure (cars, people, wind, etc.)•Dead load + Live load= Total load•Why is it necessary to calculate the Total load?–Materials–# of cables and towersWhat forces will the structure be subjected to?•Compression- the ends of an object are pushed toward the objects center•Tension- the ends of an object are pulled away from the centerWhat forces will the structure be subjected to?•Bending- one side of an object experiences compression while the other side experiences tension•Torsion- when the object twistsOther Factors•Heat–Thermal Expansion- a material expands or contracts when exposed to hot or cold temperaturesCable-stay Bridge Activity•Divide into groups of 3-4 people•Complete the group
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