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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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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: Helicoidal Staircase Study
Author(s): A. R. Cusens and Supachai Trirogna
Publication: Journal Proceedings
Appears on pages(s): 85-102
Abstract:Methods of analysis for a projected fixed-ended reinforced 80 deg helicoidal staircase as compared methods used are those of Holmes, Scordelis, Morgan, and Bergman. Tests are described on half-scale models under uniformly distributed loading. For a model based on the prototype design a load factor in excess of 4.8 was obtained. When reinforcement against lateral moment was reduced by 50 percent, together with some reduction to main steel, the load factor was 3.6. The use of ultimate strength design based on vertical moments only gave a simple and safe solution for the staircase under study. Proposals for further work in this field are made.
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