Seven-Story Concrete Brackets Support Office Tower

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Title: Seven-Story Concrete Brackets Support Office Tower

Author(s): Robert B. Johnson

Publication: Concrete International

Volume: 5

Issue: 12

Appears on pages(s): 18-22

Keywords: beams (supports); columns (supports); con-crete slabs; concrete construction; high-rise buildings; load transfer; office buildings; shearwalls; structural de-sign.

Date: 12/1/1983

Abstract:
A requirement for a 40,000 ft2 (3716 m2) column-free floor area near ground level meant that the upper 30 stories of the first of twin office towers had to be cantilevered 32 ft (10m) out over the floor. Large, heavily reinforced concrete diaphragm walls provided the brackets to achieve the required cantilever. To counteract the anticipated lateral displacement of the tower due to the cantilever, the structure was constructed out of plumb to compensate for the movement.*