A girder is a main load-supporting beam. Steel or iron girders may be made of a single piece or of laminated strips built up of plates, latticework, or bars. When the cross-section is formed in the shape of an I by riveting and welding plates or by rolling the girder, greater stiffness is achieved and larger spans are possible. Girders may also be made of reinforced or pre-stressed concrete.
Related category TECHNOLOGY
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