HIGHRISE INFORMATION.ppt

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    Advanced Structure and Construction

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    3.0 Vertical Structural Systems Pt. 3

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    Types of vertical structural systems

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    The Monadnock Building Pirelli Tower Commerzbank

    Bearing wall / pier structures

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    Pirelli Building Gio Ponti with P.L. Nervi Milan, Italy 1960

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    Mixed Use Tower Frank Lloyd Wright Bartlesville , Oklahoma 1952

    Core / cantilever structures

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    7/59 Administration Building, Johnson & Johnson Co. F. L. Wright Racine, Wisconsin 1939

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    Standard Bank of Johannesburg, S. Africa 1970

    Example of tall building with a core tree structure: floors are suspended from cantilevered arms in groups of ten floors.

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    Lake Shore Apartments (steel) Stanhope Building (reinforced concrete)

    Rigid frame structures

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    A rigid or semi-rigid frame will deform under lateral loads in two ways: a) cantilever bending and b) shear sway distortion

    The combination of these represents the actual behavior of the frame structure.

    Stiffening the frame with x-bracing, for example, will cause more cantilever bending and less shear sway

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    Core and frame systems provide adequate stiffness up to 30-40 stories. Generally cores are at the center of the building, both for

    practical reasons (daylight) and to resist shear forces more effectively. If not centered, they are usually symmetrically located.

    Core and frame structures

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    Examples of tall buildings with cores in various positions. From left to right: Knights of Columbus Building (core at four corners),

    Inland Steel (core on one side), PSFS (core on one side), and Jardin House (central core)

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    Alcoa Building, San Francisco Intl Financial Ctr, Shenyang Hotel, Barcelona Hearst Building, NYC

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    First Wisconsin Center Skidmore Owings & Merrill Milwaukee, Wisconsin 1974

    An example of a steel frame with a belt truss and outrigger system at the 15th and 41st floors, and a transfer truss at the

    3rd level. Note that the outrigger trusses are in the direction of the wind only indicating that wind resistance in the longi-

    tudinal direction is provided only by the stiffness of the frame.

    Diagrams illustrate the effect of belt truss and outriggers in st iffening a core-frame structure. Onthe right, the bending moment decreases in response to increasing stiffness provided by the belt trusses.

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    The research on tall buildings at IIT (Illinois Institute of Technology) under Mies van der Rohe and Fazlur Khan of SOM led to new

    concepts on how tall buildings might efficiently resist lateral forces. Myron Goldsmiths thesis project proposes a super structural

    frame, detached from the envelope, and capable of resisting all the lateral forces at the perimeter of the building where it can do so

    more effectively.

    Myron Goldsmith Superframe 80+ story high rise

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    The Chestnut-Dewitt apartment building (Chicago, 1961-65) and the Brunswick Building (Chicago,

    1962-66) were the starting points for Fazlur Khan and SOMs application of the concept of a framed

    tube structure for high rise buildings.

    Chestnut-Dewitt Apartment Building Brunswick Building

    framed tube tube in tube

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    One Shell Plaza Skidmore Owings & Merrill Houston, Texas 197152 story office block tube in tube structural type. All lightweight concrete. Matt foundation.

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    Alcoa Building (Truss frame) Skidmore Owings & Merrill San Francisco, CA ca 1965

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    Effect of increasing building height on weight of structure per unit area.

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    Effect of perimeter trussing to stiffen structure. John Hancock Building, Chicago, USA

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    Office level floors 26 - 33

    Street level

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    Apartment level floors 82 - 92

    Sky Lobby floor 44

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    Sears Tower (Sears & Roebuck Co.) Skidmore Owings & Merrill Chicago, IL 1974

    109 stories. Bundled tube structural concept. Height to width ratio 6.4.

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    Fazlur Khans structural systems classification

    Type 1 Shear Frames: semi-rigid and rigid

    Type 2 Interacting Systems: frame with shear truss, frame with shear belt & outrigger trusses

    Type 3 Partial Tubular Systems: end channel frame with interior shear trusses

    Type 4 Tubular Systems: exterior framed tube, bundled frame tube, exterior diagonalized tube

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    There is more fun than anything else in doing a more elegant solution for an ordinary 75-

    story building. We have a long way to go to make the skyscraper what it really can be, and it

    doesnt have to be super-tall to do this. There are ways to open up space, to make it more

    economical and to face the problems of fire and transportation and pedestrian joy at the

    bottom. These are much more interesting problems.

    William LeMessurier

    Engineering News Record November 3, 1983

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    Citicorp Center Hugh Stubbins / Wm. Lemessurier New York City 1977

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    The base of the CitiCorp Center Tower has only a central concrete lift core and four mega-columns coming down to the ground. This

    creates an open through-block site that has been filled with public space, retail shops and a reconstructed church (St. Peters

    Lutheran) seen in the left foreground of the photo.

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    Engineer William LeMessurier designed the structure of the CitiCorp Tower as a braced perimeter frame with long diagonals on the

    facades in a chevron pattern (eight floors high) collecting and transferring the floor loads to the center of each face where the mega-

    columns below are located. These faade trusses collect about 1/2 of the gravity loads and resist the entire wind loads on the

    building. At the base of the tower, where the chevrons end, a diagonally braced transfer floor is required to transfer the wind shear(resisted by the chevron trusses) to the central concrete core.

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    In the typical floor framing beams run in one direction, girders in the other.

    Diagonals at the corners are required for stiffening due to the unique chevron

    vertical structure. Note the doubling of columns at the midpoints of the sides to

    carry the concentrated vertical loading transferred by the chevrons. The coreabove the base is steel framed. Below it is reinforced concrete.

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    The tuned mass dampening system of the CitiCorp Tower.

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    Bank of the Southwest Helmut Jahn and Wm LeMessurier Houston, Texas 1982

    Comparison of types of building structures based on

    the bending rigidity index(BRI).

    See Ch.2 Tower and Office p.80

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    IFC2 Rocco Yim, Cesar Pelli Hong Kong 2002

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