The Concrete Diagonal

by John J. Zils, (M.ASCE), Assoc. Partner; Skidmore, Owings & Merrill, Chicago, IL,
Ray S. Clark, (M.ASCE), Assoc.; Skidmore, Owings & Merrill, Chicago, IL,

Serial Information: Civil Engineering—ASCE, 1986, Vol. 56, Issue 10, Pg. 48-50

Document Type: Feature article


Onterie Center in Chicago, Fazlur Kahn's last major structural design, is a companion in concrete to the diagonally braced steel John Hancock Center. It is a mixed-use building with parking and commercial areas on the lower levels, sloping from the 6th to 12th floors to provide a transition from offices to the smaller apartment floors, which begin at the 12th floor sky lobby. The diagonally braced tube is expressed on the exterior by architecturally exposed columns, spandrel beams and solid concrete infill panels. All lateral wind loads are resisted by the exterior. Concrete strengths were designed for strengths of 4,000 to 6,000 psi.

Subject Headings: Floors | Concrete | Bracing | Beam columns | Concrete beams | Lateral loads | Wind loads | Strength of materials | Chicago | Illinois | United States

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