About the Use Rationality of Confinement Reinforcement with Flat Welded Meshes in Expanded Clay Concrete Elements at Local Compression

ABSTRACT

The article presents a brief historical essay on the initiation of the use of lightweight concrete in the process of erecting buildings and structures in the United States, Europe, and the countries of the former USSR. The physical meaning of such a complex stress state as local compression is briefly described. The urgency of the work carried out from the point of view of the development of the building science on the territory of the Republic of Belarus is indicated. The publication provides a brief overview of the methods of calculating the elements of lightweight concrete with confinement reinforcement with flat welded meshes of various types existing in the valid normative documents of the USA, Europe and the countries of the former USSR. A technique for carrying out experimental studies is also presented, with references to earlier publications, a research program with the corresponding illustrative material. The article presents the main results of experimental studies of the resistance to local compression of elements made of structural expanded clay concrete elements with confinement reinforcement with flat welded meshes. The analysis of the obtained results of experimental investigations is carried out, the main schemes of crack formation in the samples are illustrated with a loss of bearing capacity. The publication presents a methodology for calculating the resistance to local compression of elements made of structural expanded clay concrete elements with confinement reinforcement with flat welded meshes, an analysis of the main parameters influencing the convergence of the theoretical and experimental values of ultimate loads, and the corresponding new dependences for determining the coefficient of efficiency of confinement reinforcement.

The article presents in analytical form an estimation for rational use of confinement reinforcement with flat welded meshes in expanded clay concrete elements. The accuracy of the proposed calculation methods was assessed in accordance with the requirements of the European norms in force in the Republic of Belarus, as well as their comparison with the current norms of the Russian Federation.

Keywords: bearing capacity, reinforced structural expanded clay concrete, experimental researches, calculation procedure, efficiency factor of confinement reinforcement, volume reinforcement factor.

For citation: Bondar V., Rak N. About the Use Rationality of Confinement Reinforcement with Flat Welded Meshes in Expanded Clay Concrete Elements at Local Compression. In: Contemporary Issues of Concrete and Reinforced Concrete: Collected Research Papers. Minsk. Institute BelNIIS. Vol. 9. 2017. pp. 129–147. https://doi.org/10.23746/2017-9-9

Full text in Russian:

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