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Bridge

Introduction
Even the most primitive humans have created bridges from material lying around in their surroundings. Hunters and gatherers always shared a common problem; streams, rivers and trenches needed to be crossed. A fallen tree can be dragged into position to serve as a plank. Forest tendrils may be intertwined as an elementary suspension bridge. Or rafts can be tied together in a pontoon (Cridlebaugh, 2002). That was the invention of the first bridge. The innovation of this basic concept came in during the Roman Empire. Romans would create a structure that could withstand great pressure and weight. This is the Roman arch - an invaluable principle which was the trailblazer for bridges in the future
There are three basic designs for bridges that we analyzed. The beam bridge is a good design when trying to span a short gap that is also not very high. It is supported on either end by land or tall columns. This bridge is normally quite heavy. The truss bridge is similar to a......


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Approximate Word Count: 783
Approximate Pages: 4 (250 words per double-spaced page)

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