The central "web" of the steel I-beam is often wider than a column web to resist the higher bending moments that occur in beams. Steel beams are connected to the columns with bolts and threaded fasteners, and historically connected by rivets. ![]() Square and round tubular sections of steel can also be used, often filled with concrete. The two wide flanges of a column are thicker and wider than the flanges on a beam, to better withstand compressive stress in the structure. The rolled steel "profile" or cross section of steel columns takes the shape of the letter " I". The development of this technique made the construction of the skyscraper possible. Steel frame is a building technique with a " skeleton frame" of vertical steel columns and horizontal I-beams, constructed in a rectangular grid to support the floors, roof and walls of a building which are all attached to the frame. Steel framed housing development Rectangular steel frame, or "perimeter frame" of the Willis building (at right) contrasted against the diagrid frame at 30 St Mary Axe (at center), in London. JSTOR ( September 2023) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. ![]() ![]() Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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