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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 ...
Framed tubes allow fewer interior columns, and so create more usable floor space. Where larger openings like garage doors are required, the tube frame must be interrupted, with transfer girders used to maintain structural integrity. Tube structures cut down costs, at the same time allow buildings to reach greater heights.
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 ...
[32] [33] He 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 near their edges to form a vertical tube-like structural system capable of resisting lateral forces in any direction by cantilevering from the foundation."
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 term structural system in structural engineering refers to the load-resisting sub-system of a structure. Structural system transfers loads to the foundation or supporting structure through interconnected structural components or members.
Structural engineers are responsible for engineering design and structural analysis. Entry-level structural engineers may design the individual structural elements of a structure, such as the beams and columns of a building. More experienced engineers may be responsible for the structural design and integrity of an entire system, such as a ...