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What are beam bridges made of?

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The first beam bridges built by humans appeared as an imitation of nature – prehistoric humans saw a tree that had fallen across a stream and used the same technique nut in places where it was convenient for them. read more

The beam bridge, also known as a girder bridge, is a firm structure that is the simplest of all the bridge shapes. Both strong and economical, it is a solid structure comprised of a horizontal beam, being supported at each end by piers that endure the weight of the bridge and the vehicular traffic. read more

The simplest beam bridge could be a log (see log bridge), a wood plank, or a stone slab (see clapper bridge) laid across a stream. Bridges designed for modern infrastructure will usually be constructed of steel or reinforced concrete, or a combination of both. read more

To build a simple bridge over a creek all you need is a stone slab or a wood plank. Modern beam bridges that can carry road traffic and railroad are made of steel or reinforced concrete which can also be prestressed or post-tensioned. read more

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Further Research

Beam Bridges History, Construction, and Future
www.brighthubengineering.com

Fun Facts about Beam Bridges
easyscienceforkids.com

What is a Beam Bridge?
www.innovateus.net