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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.
Showing 1-5 of 9 Abstracts search results
Document:
SP110
Date:
November 1, 1988
Author(s):
Editor: Jack Christiansen
Publication:
Symposium Papers
Volume:
110
Abstract:
SP110 Offering both utility and beauty, the hyperbolic paraboloid (HP) shell came to the attention of American designers in the early 1950's. Since that time, many hyperbolic paraboloid structures have been built both in the United States and around the world. This state-of-the-art report on hyperbolic paraboloids is the culmination of over ten years of research and fact gathering. Effort has been devoted to developing analysis and design data and techniques for hyperbolic paraboloid concrete shells, especially for umbrella, gable and saddle shells. "Hyperbolic Paraboloid Shells" offers the latest information on topics such as: bending theory, saddle shells, hyperbolic paraboloid performance and cost, groined vaults, membrane analysis and construction.
DOI:
10.14359/14143
SP110-07
Jack Christiansen
The performance of hyperbolic paraboloid concrete shell structures with respect to function, strength, serviceability, and economy is discussed. Cost estimates are presented for three example roof structures.
10.14359/3612
SP110-03
W. C. Schnobrich
The equations for a bending theory of shallow shells are specialized to the case of the hyperbolic paraboloid shell. The nature of the analytic solutions to these equations that have been achieved for this class of shells is described. Such analytical solutions involve boundary conditions that depart significantly from those present in real shell applications. Types of numerical approximate solutions present as alternatives are noted and the details of one of these, the finite element method, are described. The importance of the dead weight of perimeter or support beams is noted, demanding a bending solution with real support conditions. Some representative solutions are included as examples.
10.14359/2808
SP110-08
Milo S. Ketchum
Construction of hyperbolic paraboloidal concrete shell roof structures is discussed, including the phases for selection, economy, forms, reinforcing, concrete materials, placing, and curing. Umbrella shells have the greatest potential for economy for large commercial or industrial construction. Gabled shells and saddle shells are suited to long span monumental buildings. Shells require high standards of concrete construction and the close cooperation of the architect, the engineer, and the contractor.
10.14359/3420
SP110-01
W. C. Scnobrich
Shell structures mobilize geometry to activate both the membrane and the flexural internal force systems to efficiently support any distributed loads applied to those structures. Based primarily on their efficiency, these geometric structural forms are employed in a number of industrial applications such as pressure vessels, containment structures, etc., where the principal function of the structure is to contain or sustain a particular loading environment. This selection is especially true when substantial loads such as high internal pressures are involved. The shell structures selected for these applications are simple forms, most frequently combinations of various shells of revolution such as cylinders, cones, spheres, and (for the pressure vessels) the torospherical or ellipsoidal shapes, because of their ability to respond to most loads by a membrane state over the major area of the shell. Edge effects are confined to a narrow zone near the edge or around a zone of discontinuity that may be present as a result of geometry changes. In addition, shell forms contain a number of functional, economic and aesthetic virtues that make them logical choices for applications to building structures. For repetitive structures and for those needing long, column-free spans, reinforced concrete shell roofs have often been chosen. Furthermore, these structures provide a clean inner surface, often in a pleasant geometric shape. They have good fire-resistance qualities. By proper orientation or shape selection, glass areas can be placed so that natural lighting can be directed onto all or nearly all the covered ground plan.
10.14359/3164
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