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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 26 Abstracts search results
Document:
SP12
Date:
January 1, 1965
Author(s):
Sponsored by: ASCE, ACI, Univ of FL-College of Engrg, and NSF
Publication:
Symposium Papers
Volume:
12
Abstract:
SP12 Contains the proceedings of the 1964 International Symposium on Flexural Mechanics of Reinforced Concrete. In addition to providing a more basic understanding of the complex, non-ideal flexural behavior of reinforced concrete, this publication aims to further both immediate and long-range objectives in improving the analytical and statistical basis for the flexural design of reinforced concrete.
DOI:
10.14359/14064
SP12-19
Peter R. Barnard
With discussion by Leonard G. Tulin and Kurt H. Gerstle, Ralph M. Richard and Stanley D. Hansen, and Peter R. Barnard. The purpose of this paper is to explain, in the light of recent research into the concrete stress-strain relationship in compression, the flexural behavior of statically indeterminate reinforced conrete beams when loaded to collapse. Based on the concept of concrete as a strain-softening material, it is shown that a length of a beam can continue to rotate when moment is falling off and that rupture will not occur unless the energy balance in the beam ceases to be satisfied. In a comparison between the inelastic behavior of structural steel and reinforced concrete beams, it is shownthat in the latter there is a distinct maximum load which such a beam can withstand; that hinging regions tend to contract rather than spread as in steel; that it is possible for some regions of a beam to be falling off in moment while the total load on the beam is increasing; and that moment redistribution occurs through falloff in moment at some sections as well as through inelastic action. Finally, the possible development of true collapse methods for the analysis or design of indeterminate reinforced concrete beams is discussed.
10.14359/16730
SP12-15
Herbert A. Sawyer, Jr.
With discussion by M. Z. Cohn, Milik Tichy and Milos Vorlicek, and Herbert A. Sawyer, Jr. It is proposed that statically indeterminate beams and frames be designed for suitably low probabilities of failure for two failure stages. One stage would be wide cracking, using an elastic analyses for stresses at a section and for distribution of moments. The other stage would be crushing-spalling, for which the conventionalultimate strength analysis wouldbe used at sections, and an analysis based on a bilinear moment-curvature relationship and plasticity factors would be used for the distribution of moments. The required moment-curvature relationships and plasticity factors are derived and presented quantitatively. The design procedure based on these analyses is outlined, and revisions in present load factors, based on both a critical re-examination of simplebeam test results and the special characteristics of bilinear analysis, are recommended. Finally, the quantitative evidence available on the validity of the proposed method from the experimental investigations of continuous beams by Glanville and Thomas, Mattock, Ray and Nilsen, and Petcu and Cohn, is presented. Agreement is good within the limited range of these investigations.
10.14359/16726
SP12-16
Emilio Rosenblueth and Roger Diaz de Cossio
With discussion by Peter R. Barnard, HerbertlA. Sawyer,,M.Z. Cohn, and Emilio Rosenblueth and Roger Diaz de Cossio. Failure due to crushing is a case of instability. The traditional nonlinear moment-curvature approach does not hold for systems exhibiting descending (unstable) portions in their force-deformation characteristics. A method based on a moment-rotation approach and an assumed contaminated zone is presented, which takes into account descending branches.
10.14359/16727
SP12-17
A. A. Gvozdev
h accordance with recent views that have been clearly expressed in the 1954 and 1962 Building Codes of the USSR [ 1], [ 2] ,2 the 1963 recommendations of the CEB, and to some degree in other building codes of the world, the purpose of the calculations described herein is to evaluate whether a structure will attain some limiting state that would render its normal utilization impossible, or improbable. The different limit states are: (1) Failure (Loss of strength, impaired endurance, loss of stability) ; ( 2) excessive deformations; (3) excessive vibrations; or (4) excessive cracking that would reduce the durability or adversely affect the appearance.
10.14359/16728
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