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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Construction of Post-Tensioned Roof Panels
Author(s): Jack L. Korb
Publication: Journal Proceedings
Appears on pages(s): 475-491
Keywords: abrasive blasting;air terminals;beams (structural);columns (structural); construction;contraction;curved beams;expansion;exposed concrete;formwork (construction);prestressed concrete;post-tensioning;placing;quality control; roofs;shoring;slabs
Abstract:A two-paper report combined under one general title, the following two papers describe first the design presented by members of the design team, then construction presented by a member of the construction firm that built this imposing structure. A key feature of the $5,500,000 North Terminal Building of the Detroit Metropolitan Airport is the horizontally curved post-tensioned girders supporting the roof. The 150 x 300~ft roof consists of five independent 70 x 232~ft post-tensioned panels separated by 5 ft wide continuous skylight strips. Each panel is made up of a slab, upturned perimeter beams, two horizontally curved girders, and two cross-arm beams. A single pair of tapering 60 ft reinforced concrete columns support each roof panel. The columns vary in cross section from a four-pointed star at the base to a hexagon at the top. A combination of board finishing for the columns, roof slab and beams, and sandblasting for the wall panels gives the terminal building a pleasing architectural appearance. The choice of construction method, engineering assumptions, and structural design are described by the structural engineers, while the construction of the roof panels and columns, formwork and erection, post-tensioning procedures, and field control are discussed by the vice president of the general contractor’s firm.
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