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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: Jack's Spring Shell Off Formwork
Author(s): Hannskarl Bandel
Publication: Journal Proceedings
Appears on pages(s): 1095-1104
Abstract:Design and construction features of the hyperbolic paraboloidal shell that roofs the central court of the National Library of Medicine at the National Institute of Health Methesda, Md., are described. The four segments of the saddle-shaped roof cover an area-97 x 97 ft. and rise 2 3 ft. above the main portion of the building. The sag of the gable frames of the shell caused a problem. Since a major part of this deformation was due to bending in the supporting columns, an artificial, counter displacement was introduced. The introduction of the deflection had the effect of springing the shells off their formwork
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