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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 20 Abstracts search results
Document:
SP76-01
Date:
October 1, 1982
Author(s):
Max Zar
Publication:
Symposium Papers
Volume:
76
Abstract:
Creep, shrinkage, and temperature effects on concrete structures are discussed from a design perspective. Research into these problems and various solutions to these problems are looked at. Also emphasized is the importance of complex, sophisticated techniques of analysis for special structures, such as nuclear reactor containments.
DOI:
10.14359/6782
SP76-02
Zdenek P. Bazant and Liisa Panula
A new model for the prediction of creep and shrinkage (which is presented in full detail elsewhere), along with a large scope verification by test data, is outlined in simple terms, explained and illustrated in this paper. In this model, the total creep strain is separated into the basic and drying creep components, but not into "reversible" and "irreversible" creep components. The effect of environmental relative humidity is modeled by vertical scaling of the drying creep term. The effect of specimen size is modeled by a horizontal shift of the drying creep term in the logarithmic time scale, and the basic creep term is unaffected by humidity and specimen size. The effects of humidity and size upon the drying creep are modeled completely analogously to those on shrinkage. The dependence of shrinkage as well as drying creep on the size of the cross section is introduced by means of shrinkage-square halftime, which is the same for both shrinkage and drying creep. Finally, the basic creep component of total creep strain is characterized by double power law.
10.14359/6783
SP76-03
Paul P. Kraai
Concrete drying shrinkage, as measured by ASTM C-157--Length Change of Hardened Cement Mortar and Concrete, represents a total value which is influenced by the cement type, aggregate source, and the test method. Based on available test data, percentage values can be assigned to each of the above contributions. One purpose of this paper is to show that ASTM C-157 is primarily a laboratory test and not a field test. A second purpose is to relate laboratory shrinkage to structure shrinkage. A third purpose is to relate the above shrinkagfe data to the volume change of field concrete which is also significantly influenced by ambient conditions.
10.14359/6784
SP76-04
Andrew Scanlon
The results of a parameter study of factors affecting time-dependent slab deflections are presented. The study is based on a finite element plate-bending analysis. Concrete is treated as an ageing linear viscoelastic material and the effects of shrinkage and cracking are included. Factors studied include creep and shrinkage, tensile behaviour of concrete, span to depth ratio, column width to span ratio, loading history, and reinforcement layout. A brief assessment is made of simplified procedures for computing slab deflections.
10.14359/6785
SP76-05
Heinrich Trost
The proposed calculation procedure is based on a reference deflection at the interesting point of the uncracked concrete member. This reference deflection is calculated on the basis of the existing distribution of the gross section stiffness-in analogy to the usual determination of the design forces in statically indeterminate systems-- as available from tables or handbooks. Then this reference value, either for the maximum service load or for the sustained load when time-dependent effects are concerned, is multiplied by reinforcement-dependent coefficients given in figures or calculable from closed formulae in order to obtain the initial deflection and the time-dependent deflection due to creep and shrinkage. The probable deflection, as the prognostic value of interest and in which the deflection-reducing effect of the reinforcement and the tension stiffening is considered, is determined by interpolation between the deflections in the limit states according to the acting moment level.
10.14359/6786
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