1) Beams 2) Beams as main supports 3) Bridge parts 4) Building supports 5) Construction beams 6) Some members 7) Steel bands 8) Supporting beams 1) Ibars 2) I-beams 
(Learning Modules / Mathematics / Bridges) A beam, usually made from concrete or steel, that is designed to strengthen another structural element. Concrete beam bridges often have steel girders beneath the road deck in order to help bear the tensile forces.