Abstract
This article presents a theoretical study of a stress-strain state of layered reinforced concrete - foam concrete floor slabs (hereinafter called as the LRFCS), with the use of a deformation analysis. Compressive and tensile diagrams of the foam concrete, a tensile diagram of the reinforced concrete and compressive and tensile diagrams of the reinforcement rod are used for the estimation of the stress-strain state of the calculated cross-section of the LRFCS. It should be noted that this article presents the deformation method of loading by the scheme of pure bending for the LRFCS. This deformation method of loading is determined by six shapes of the stress-strain state. These shapes of the stress-strain state are represented by the corresponding distribution diagrams of the relative deformations and the distribution diagrams of internal stresses in the calculated cross-section of the floor slab. Also, this article presents the corresponding equilibrium equations of internal efforts and moments, which act in the calculated cross-section of the floor slab for all shapes of its stress-strain state. Consequently, the mentioned recommendations and mathematical dependencies allow to evaluate the stress-strain state of the LRFCS from its initial loading to its destruction.
Highlights
The different methods of calculation for the bending building structures were changing depending on the achievement of science and technology
Accepted diagrams of dependencies of the stresses from relative deformations along the height of the calculated cross-section are different for different materials, which are acted upon by the load, and for different conditions of their work
They are resultant forces of tensile stresses or compressive stresses that are perceived by corresponding layers of non-autoclave foam concrete, normal concrete, and upper and lower reinforcement rods
Summary
The different methods of calculation for the bending building structures were changing depending on the achievement of science and technology. Linear and deformation analyses are the most widespread methods of calculation to estimate a stress-strain state of the bending building structures. These calculation methods have positive and negative features. The evaluation of the behaviour of the bending element from the initial load to its destruction can be carried out with the use of a deformation analysis [3, 4]. This analysis allows to understand the structural behaviour of structures in the serviceability and ultimate limit states [5, 6]. The deformation analysis allows to simulate the behaviour of the structure from the initial load to its destruction based on the deformation diagrams of the material
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