Concerning of calculation of the reinforced concrete prestressed containments of nuclear power plants

Authors

  • A. M. Bambura Doctor in Technical science, professor, Ukraine
  • I. R. Sazonova Engineer, senior scientist, Ukraine

Keywords:

Reinforced concrete element, deformation method, rectangular section, reinforcement area, analytical dependences, pre-stressing. 

Abstract

Annotation. Goal. The purpose of this work is to develop an analytical apparatus for a simplified determination of the area of ordinary and pre-stressed fittings in the stretched zone of the bent element of a rectangular section with single-layer reinforcement. Techniques. When bending a reinforced concrete element of a rectangular section with reinforcement in a stretched zone in one layer it is possible to carry out the initial purpose of reinforcement. Previously, the equilibrium equation is a system of nonlinear equations and its solution in the boundary state does not always correspond to the maximum bearing capacity. The "moment-curvature" diagram in some cases has an extremum (there is a descending branch), which is far from the boundary state. At the preliminary determination of reinforcement for a rational boundary state, simultaneous implementation of boundary deformations in compressed (εcu) and stretched (εs0) zones was made. The analysis of the equilibrium equations obtained by the deformation method showed that for bending structures it is possible to determine the reinforcement in the boundary state for both equations. Results. A methodology and algorithm for a simplified determination of the area of a conventional and pre-stressed stretched armature for a rectangular cross section is proposed. In order to evaluate the accuracy of the analytical dependencies obtained, calculations were made to determine the area of the ordinary and pre-stressed fittings in the stretched zone with single-layer reinforcement. Comparison of the results of calculations with the simplified method with direct calculation according to the deformation method showed that the error in the preliminary determination of the area of the armature does not exceed 8.5%. According to the presented algorithm, for the simplified determination of the area of stretched reinforcement for a rectangular cross-section, examples are given of calculating a beam with a conventional and prestressed reinforcement.Scientific novelty. The analytical dependencies and the methodology for the simplified determination of the area of the usual and pre-stressed reinforcement in the stretched zone with single-layer reinforcement are obtained. Practical significance. The recommended simple dependencies allow you to determine the reinforcement area of the bending structures, regardless of which deformation pattern the concrete is used. The obtained dependencies allow to determine the area of both conventional and pre-stressed fittings.

Author Biographies

A. M. Bambura, Doctor in Technical science, professor

Department of building and structures reliability, State enterprise «The State research and development Institute of building constructions», 5|2, Preobrazhenska Str., Kyiv, 03037, Ukraine, tel. +38 (044) 249-37-44

I. R. Sazonova, Engineer, senior scientist

Department of building and structures reliability, State enterprise «The State research and development Institute of building constructions», 5|2, Preobrazhenska Str., Kyiv, 03037, Ukraine, тел. +38 (044) 249-38-88

References

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Published

2017-08-30

Issue

Section

Innovative lifecycle technology of housing and civil, industrial and transportation purposes