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Geometry Of Bridge Construction - ConstructionFeeds
The beam or truss bridge is, to all intents and purposes, a pair of beams backing a deck covering the gap between two pillars. A beam has to endure both compression and tension, the first one (compression) is in its upper parts and the last one (tension) in its lower parts. During the time of passing over supports, other forces get involved. A beam could be a void box support or an open frame or truss.