These things support the downward weight of the bridge and any traffic traveling over it. The simplest beam bridge could be a log, wood plank, or stone slab laid across a narrow creek or stream. More complicated ones are usually constructed of steel or concrete or a combination of the two. The concrete elements may be reinforced, pre-stressed, or post-tensioned. In supporting weight, a bream bridge endures both compressive and tension stress. To understand how this works, think about this simple model or try it out in your garage. Imagine taking a board and laying it on top of two bricks. If you were to place a heavy weight in the middle of the board, it would bend. The top side would bend in under the force of compression, and the bottom side would bend out under the force of tension.
Add enough weight, and the “bridge” would eventually break. The top side would buckle and the bottom side would snap. With this example, you can understand the factors an engineer needs to consider when designing a bridge.īeam bridges are generally used to cross relatively short distances (usually less than 250 feet) because unlike other types of bridges, they have no built-in supports. The farther apart the supports, the weaker a beam bridge gets. This doesn’t mean beam bridges can’t be used to cross longer distances, it simply requires that a series of beam bridges must be joined together, creating what’s known as a continuous span. Location: Metairie and Mandeville, Louisiana.īest bridge for west point bridge designer 2016 series#.Construction: Continuous-span beam bridge.Longer, more complex beam bridges are built using many beams lined up side by side with a deck across the top of them. The main beams could be I-beams (also known as H-beams), trusses, or box girders. They could run halfway across the bridge or across its full length.īeam bridges are used to carry pedestrians, automobiles, trucks, and rail lines across limited-distance spans. Best bridge for west point bridge designer 2016 full#
They’re frequently used for monorail and raised transit systems.
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