A box girder is a type of beam used in bridge construction that has a hollow rectangular or square shape. This design provides strength and stability while being lightweight, making it effective for spanning long distances. Box girders are commonly made from steel or concrete and are often used in modern bridges, including highway overpasses and railway bridges. The hollow shape allows for efficient use of materials and helps to reduce the overall weight of the structure. Box girders are known for their ability to support heavy loads while maintaining a sleek and streamlined appearance.

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