Zveza društev gradbenih inženirjev in tehnikov slovenije
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Objavljeno v: Gradbeni vestnik - 4,5 - 1969

Avtorji

dr. Srdan Turk, dipl. inž.

Ekonomsko dimenzioniranje armiranobetonskih konstrukcij

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Economical dimensioning of reinforced concrete constructions

Synopsis
Owing to the great multitude and value of existing reinforced concrete structures, even a little improvement of the dimensioning technique of those structures could bring considerable savings to our national economy. To this end some conclusions from the author’s own investigations of these problems are brought together in the present article. These conclusions permit a rapid determination of the economical dimensions of reinforced concrete structures.
The methods, indicated in the article, are useful first in the elaboration of design since they permit a rapid determination of economical basic dimensions. Some more accurate formulas are well serving the determination of final dimensions for the principal design. At last the paper also exposes simple summary criteria for an economical dimensioning of reinforced concrete constructions to be considered in the evaluation resp. control of projects from the economical point of vieu.
Particularly the just mentioned criteria represent a novelty in the theory of econom of structures and some of them are given just in the present summary.
The article discusses first the problems of economy of girders subject to the bending load. From the argument it1 follows that the economical height of a girder is reached in the moment where the expenses for the reinforcement are equal to the expenses for the vertical forms. In the slabs resp. in the girders whose width is determined there is a economical re-quierement according to which the expenses for the reinforcement should be approximatively equal to the sum of expenses needed for the concrete as well as vertical forms. From the arguments relating to the columns one can establish that in the case of a little excentricity of the resultant the cheapiest cross-section is that when the static necessary reinforcement is identical to the prescribed minimal reinforcement i. e. when the expenses for concrete are approximately equal to the expenses for reinforcement. In the case of a great excentricity of the resultant it is appropriate from the economical point of view to use more reinforcement until the point is reached when the expenses of concrete, increased by the value of the vertical forms.

Synopsis

Owing to the great multitude and value of existing reinforced concrete structures, even a little improvement of the dimensioning technique of those structures could bring considerable savings to our national economy. To this end some conclusions from the author’s own investigations of these problems are brought together in the present article. These conclusions permit a rapid determination of the economical dimensions of reinforced concrete structures.

The methods, indicated in the article, are useful first in the elaboration of design since they permit a rapid determination of economical basic dimensions. Some more accurate formulas are well serving the determination of final dimensions for the principal design. At last the paper also exposes simple summary criteria for an economical dimensioning of reinforced concrete constructions to be considered in the evaluation resp. control of projects from the economical point of vieu.

Particularly the just mentioned criteria represent a novelty in the theory of econom of structures and some of them are given just in the present summary.

The article discusses first the problems of economy of girders subject to the bending load. From the argument it1 follows that the economical height of a girder is reached in the moment where the expenses for the reinforcement are equal to the expenses for the vertical forms. In the slabs resp. in the girders whose width is determined there is a economical re-quierement according to which the expenses for the reinforcement should be approximatively equal to the sum of expenses needed for the concrete as well as vertical forms. From the arguments relating to the columns one can establish that in the case of a little excentricity of the resultant the cheapiest cross-section is that when the static necessary reinforcement is identical to the prescribed minimal reinforcement i. e. when the expenses for concrete are approximately equal to the expenses for reinforcement. In the case of a great excentricity of the resultant it is appropriate from the economical point of view to use more reinforcement until the point is reached when the expenses of concrete, increased by the value of the vertical forms.

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