307-684 Long Spans in Post-Tensioned Architectural concrete


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Title: 307-684 Long Spans in Post-Tensioned Architectural concrete

Author(s): Raymond S. Clark and John Zils

Publication: Concrete International

Volume: 6

Issue: 9

Appears on pages(s): 07-12

Keywords: architectural concrete; concrete construc-tion; framing systems; high-rise buildings; post-tension-ing; structural design.

Date: 9/1/1984

The structural design and detailing of a long-span post-tensioned framing system in exposed aggregate architectural concrete for a high-rise building is discussed. As in any architectural concrete structure, appropri-ate attention was given to the selection of materials, use of admixtures, and the development of reliable mix proportions. Formwork and forming systems were critical in achieving uniform concrete surfaces. Concrete finishes and techniques of achieving the finishes were consistent throughout the structure due to a comprehensive quality control program. Proper detailing was required to insure strength and serviceability of the structure. Additional special detailing of post-tensioned anchorages was required to provide for interior stressing of all members, thereby eliminating the need for anchor pockets at the exterior architectural surfaces. Construction sequencing played an important role in establishing structural design criteria.