PROBLEM TO BE SOLVED: To completely or partially maintain a traffic function fulfilled by a bridge, even on the occurrence of a large-scale disaster.
SOLUTION: A cross-sectional shape of a bridge girder 2 is set to be a vertically asymmetric shape, the upside 4 of which is approximately horizontal and which is elongated to a downside in such a manner as to be curved downward from a lateral side of at least one width-direction side continuing into the upside 4 or bent in a polygonal shape. Thus, lift generated in a thickness direction in the bridge girder 2 during overtopping is directed downward.
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