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By 1963, a new structural system of framed tubes had appeared in skyscraper design and construction. Fazlur Rahman Khan, a structural engineer from Bangladesh (then called East Pakistan) who worked at Skidmore, Owings & Merrill, defined the framed tube structure as "a three dimensional space structure composed of three, four, or possibly more frames, braced frames, or shear walls, joined at or ...
Tube-frame construction was first used in the DeWitt-Chestnut Apartment Building, designed by Khan and completed in Chicago in 1963. [5] It was used soon after for the John Hancock Center and in the construction of the World Trade Center. A variation on the tube frame is the bundled tube, which uses several interconnected tube frames.
Framed tubes allow fewer interior columns, and so create more usable floor space. The bundled tube structure is more efficient for tall buildings, lessening the penalty for height. The structural system also allows the interior columns to be smaller and the core of the building to be free of braced frames or shear walls that use valuable floor ...
A classification for the structural system of a high-rise was introduced in 1969 by Fazlur Khan and was extended to incorporate interior and exterior structures. The primary lateral load-resisting system defines if a structural system is an interior or exterior one. [2] The following interior structures are possible: Hinged frame; Rigid frame
Tube frame may refer to: Tube (structure), a structure designed to act like a three-dimensional hollow tube so to resist lateral loads; Space frame or space structure, a truss-like, lightweight rigid structure constructed from interlocking struts in a geometric pattern; Superleggera, sometimes referred to as a tube-frame structure
The John Hancock Center is a braced tube structure. Most braced frames are concentric. This means that, where members intersect at a node, the centroid of each member passes through the same point. Concentrically braced frames can further be classified as either ordinary or special. Ordinary concentric braced frames (OCBFs) do not have ...