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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 16 Abstracts search results
May 1, 2005
Current practice related to design of concrete structures for deflection control is reviewed. The paper discusses the limitations of the current code procedures based on minimum thickness rules and deflection calculations. Results are presented to demonstrate the sensitivity of deflections to span to depth ratio, sustained live load, and extent of cracking.
March 1, 2005
P. J. E. Sullivan
Three approaches to fire design are currently available: (1) The direct application of data from furnace tests on simply supported members heated at the ISO 834 Time/Temperature standard rate. (2) Conventional ultimate limit state design in bending for fire, taking into account idealised material losses in strength at elevated temperatures. (3) Complete analysis of structural members using iterative finite difference or finite element techniques to estimate temperature gradients and determining the resulting stress and strain resultants. Prescriptive design falls into the first category and the thickness of the protective cover to the steel together with the minimum dimensions of the element is tabulated in building codes. Performance design would be carried out by the other 2 methods, where the applied heat impinging the surface due to a fire is assessed, the temperature distribution evaluated and the deterioration determined. This method is more appropriate for important structures with indeterminate members.
R. W. Furlong
Building Codes have specified for the purpose of design, that “Theory of Elastic Frames” be used for analyses of indeterminate structures. Sophisticated computer software has been developed based on the condition of elastic response to loading. Designers rely on computed results from such analyses as if those results were perfect and reliable evaluations of structural behavior. The influence of assumptions regarding accepted simplifications, member stiffnesses, load definitions and frame connectivity is addressed. Reliability from elastic analyses is revealed as an illusion, and less sophisticated alternate analytic requirements are suggested.
K. B. Bondy, FACI
This paper critically examines the deflection criteria in Chapter 9 of the current ACI Building Code, ACI 318-02, with a particular focus on two-way non-prestressed slabs. The relationship between criteria based on deflection computations and arbitrary minimum thicknesses, which are independent of loading and concrete strength, are scrutinized. A numerical example is presented in which it is demonstrated that current code criteria can lead to unsatisfactory performance in heavily loaded slabs. Recommendations are made for changes to improve code deflection criteria.
Editors: Florian Barth, Robert Frosch, Hani Nassif, and Andrew Scanlon / Sponsored by: ACI Committee 224 and Joint ACI-ASCE Committee 421 and ACI Committee 435
The Edward G. Nawy Symposium was sponsored by ACI Committees 224, Cracking; 421, Design of Reinforced Concrete Slabs; and 435, Deflection of Concrete Building Structures. The symposium and this special publication celebrate and honor the distinguished career of Dr. Nawy as an outstanding educator, committed researcher, influential author, and professional engineer. This special publication offers technical papers on aspects of concrete serviceability, with emphasis on concrete cracking and deflection for prestressed and non-prestressed members.
Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order.
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