CONCRETE

UDC 69.07

[:en]Guladze Т. I.[:ru]Гуладзе Т. И.[:] [:en]Candidate of Technical Sciences, Docent, Chief Designer of the Department of Construction Engineering and Reconstruction of JSC “KtB ZhB”, Russia[:ru]канд. тех. наук, доцент, гл. конструктор отдела строительного инжиниринга и реконструкции АО «КТБ ЖБ», Россия[:]

[:en]Kataev D. Yu.[:ru]Катаев Д. Ю.[:] [:en]Head of the Department of Construction Engineering and Reconstruction JSC “KtB ZhB”, Russia[:ru]зав. отделом строительного инжиниринга и реконструкции АО «КТБ ЖБ», Россия[:]

Alitinform №1 (62) 2021 г. 16-29 p.

Abstract

The article describes the studies of low-rise prefabricated and monolithic framework systems with reinforcement tension of floors in construction conditions from low-modulus concretes of various types (fine-grained, lightweight and cellular). Studies have found that it is possible to improve the technical and economic indicators of low-rise (up to three storeys) systems by using the available reserves of bearing capacity when using low-modulus concretes instead of heavy concretes (in comparison with concretes with a bulk density γ < 24 kN/m3 and an initial modulus of elasticity E0 < 30·103 MPa) of various types, with reinforcement tension on concrete during construction (under construction conditions). The use of low-modulus concretes in such framework systems will also allow the use of small-piece elements: columns (consisting of four prefabricated elements) and floor slabs and coverings (consisting of three or more elements). Furthermore, during the installation of these framework systems, due to the reduction in the dimensions and weight of the bearing structures, it becomes possible to use small mechanization (winches, hoist and hydraulic jack), which is an advantage over prefabricated reinforced concrete framework buildings, where heavy mechanization is used during the installation of the structure with high material and labor costs.

Key words:

low-rise prefabricated and monolithic framework systems, reinforcement tension in construction conditions, low modulus concretes, prestressing of reinforcement, columns, floor slabs, side elements