Hypar Recreational Complex Built Under Football Field

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Title: Hypar Recreational Complex Built Under Football Field

Author(s): Daniel F. Tully

Publication: Concrete International

Volume: 1

Issue: 8

Appears on pages(s): 50-57

Keywords: concrete construction; diaphragms (con-& e); edge beams; forming techniques; formwork (construction); hot weather construction: hyperbolic parabolic shells; loads (forces); mix proportioning; placing; post-tensioning.

Date: 8/1/1979

Abstract:
No land being available, the designer created an underground sports facility and placed a football field on top of it for Georgetown University, Washington, D.C. Concrete bearing walls are 85 percent below grade. Covering two clear-span recreation areas, each 130 x 325 ft (40 x 99 m), is a roof of hyperbolic paraboloid shells, eleven of them 65 x 130 ft (20 x 40 m) in dimension. A concrete surface roof slab, overlaid with artificial grass, restored the university’s football field.