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The Beam bridge costs less. And much, much smaller. The Beam bridge costs less. And much, much smaller.
It depends on the type of beam, the material, whether it is a bridge span or cantilever, the allowable deflection and safety margin needed. We need a lot more data on the application.
Arch bridges are in the shape of an upside down "U" with mainly steel beans, while supension bridges have one or two Major verticle beams with strong wire connecting to the bridge.
A simple way is to use the specification of the beam, most beams will have a specification saying how much it ways per meter or per foot. Calculation. weight = Area*Length*density *Note that when calculating the weight of a beam for structures a safety factor which will be defined in you country design code
Mass, in architecture, refers to how much weight an object can hold, such as a ceiling beam or a floorboard.