... bridge ,workshope ,building.....An I-beam, also known as H-beam, W-beam (for "wide flange"), rolled ... in Polish, Spanish and German), is a beam with an I- or H-shaped cross-section ... resists shear forces while the flanges resist most of the bending moment experienced by the beam. Beam theory ... shows that the I-shaped section is a very efficient form for carrying both bending and shear ...