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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 22 Abstracts search results

Document: 

SP27-18

Date: 

January 1, 1971

Author(s):

Zdenek P. Bazant

Publication:

Symposium Papers

Volume:

27

Abstract:

For the rate-type creep law of concrete (Eq. 1), the general problem of creep analysis is converted to a sequence of elasticity problems with intial strains. It is shown how this general method can be applied to the analysis of composite beams. The method is demostrated by a numerical example. It is found that statical indeterminancy of supports significantly alters the effects of shrinkage in composite beams.

DOI:

10.14359/17192

Document: 

SP27-19

Date: 

January 1, 1971

Author(s):

C.H. Wang

Publication:

Symposium Papers

Volume:

27

Abstract:

Data on creep of concrete subjected to various loadings at elevated temperatures rang 200F (93.3C) to 800f (426.8C) are presented, together with the informations of specimens failure in test. Compressive strength and thermal expansion coefficient of concrete in this temperature range are also provided. Relationships between creep, stress strength ration and time under loading are shown in curves.

DOI:

10.14359/17193

Document: 

SP27-20

Date: 

January 1, 1971

Author(s):

Zdenek P. Bazant

Publication:

Symposium Papers

Volume:

27

Abstract:

To determine the internal forces induced by shrinkage in restrained elements or structures whose free shrinkage in the unrestrained state is known, it is necessary to take into account the creep properties and their dependence on age of concrete. The problem leads to an integral equation which has been solved by computer for various typical values of material characteristics. Graphs were then constructed from which the effect of shrinkage can be determined.

DOI:

10.14359/17194

Document: 

SP27-21

Date: 

January 1, 1971

Author(s):

Zdenek P. Bazant

Publication:

Symposium Papers

Volume:

27

Abstract:

Creep, shrinkage and delayed thermal dilatation of concrete at low stress are caused by mass transport of water and other molecules along thin layers in the microstructures. The theory of the consitutive equation based on this mechanism is summarized and, as an example, a plausible explanation of the phenomenon of drying creep is presented.

DOI:

10.14359/17195

Document: 

SP27-13

Date: 

January 1, 1971

Author(s):

D.E. Branson and M.L. Christiason

Publication:

Symposium Papers

Volume:

27

Abstract:

Presented are design procedures for predicting strength and elastic properties, creep, and shrinkage as a function of time. Continuous functions are provided for all standard equations and correction factors, so that the procedures readily lend themselves to computer solution.

DOI:

10.14359/17187

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