On Minimum Reinforcement in Concrete Structures
Publication: Journal of Structural Engineering
Volume 111, Issue 12
Abstract
The usual criteria to fix minimum reinforcement in concrete structures require first, that the cross section of reinforcement be dimensioned so that the tensile stresses acting on the ``embedment section'' of concrete, when concentrated on the steel after cracking, do not exceed its elastic limit, and second, the crack width be kept within established limits. But these rules neglect some important aspects as soon as cracking provokes significant redistribution of stresses. The incidence of redundancy is decisive in the presence of imposed deformations. An interesting example is the case of a well in which thermohygrometric effects generates a diffused state of tension. From a finite elements analysis it appears that, in the mid-vertical section, a limited opening of the crack enduces a marked relaxation, the sum of the tensile stresses along the section being much smaller than before crack formation. This result suggests the idea to replace evenly distributed bars with series of well-reinforced chords (or prestressed prismatic elements) spaced so that they may keep within acceptable limits the opening of cracks in the intermediate zones and allowing to exploit the release of stresses to cut down load effects in restraining elements.
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References
1.
Carbone, V. I., and Marro, P., “Regime Fessurativo di Muri su Suolo Elastico” (Cracking Behavior of Walls on Elastic Support), Atti Istituto di Scienza delle Costruzioni, Politecnico, Torino n. 622—Dec, 1983 (in Italian).
2.
Levi, F., “Les états de coaction, aspect spécifiques et influence opérationnelle,” Centennial Conference on A; Castigliano, Turin, Italy, 1984.
3.
“Model Code for Concrete Structures, CEB‐FIP,” FIP Congress, London, England, 1978.
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Copyright © 1985 ASCE.
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Published online: Dec 1, 1985
Published in print: Dec 1985
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