Definitions for i-beamˈaɪˌbim
Random House Webster's College Dictionary
a rolled or extruded metal beam having a cross section resembling anI.
Category: Building Trades
Origin of I-beam:
girder having a cross section resembling the letter `I'
A beam shaped like a capital letter I (with serifs top and bottom), used in construction.
A cursor shaped like the letter I, usually indicating the presence of editable text.
An I-beam, also known as H-beam, W-beam, Universal Beam, Rolled Steel Joist, or double-T, is a beam with an I- or H-shaped cross-section. The horizontal elements of the "I" are flanges, while the vertical element is termed the "web". The web 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 loads in the plane of the web. On the other hand, the cross-section has a reduced capacity in the transverse direction, and is also inefficient in carrying torsion, for which hollow structural sections are often preferred.
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