Let’s Learn About Bridges. Simplest bridge form A log across a street was the earliest form of a beam bridge Consists of a horizontal beam supported at each end by a pier The weight of the beam pushes down on the piers The farther apart the piers, the weaker the beams
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Horizontal BeamBeam Bridge
These bridges can span 2,000 to 7,000 feet -- much farther than any other type of bridge!