What is "i-beam"

An -beam, also known as H-beam, W-beam (for "wide flange"), Universal Beam (UB), Rolled Steel Joist (RSJ), or double-T (especially in Polish, Bulgarian, Spanish, Italian and German), is a beam with an or H-shaped cross-section. The horizontal elements of the "" are known as flanges, while the vertical element is termed the "web". I-beams are usually made of structural steel and are used in construction and civil engineering.

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.

The I-Beam was a popular nightclub in San Francisco that was located in the Haight-Ashbury neighborhood at 1748 Haight Street. Before opening the club, Sanford Kellman had an impromptu party there and found that all the neighbors complained about the noise. Therefore, Sanford Kellman was required by the City government of San Francisco to soundproof the entire building at great expense, delaying the opening of the club for several months. On the opening night of the club in October 1977, groups of bare-chested men in jeans and construction hats carried I-Beams on their shoulders into the club.