Influence of long-term exposure to loads on the annular sections’ strength and rigidness

Victor L Shchutskiy ,Alik Blyagoz,Sergey Shchutskiy,Svetlana Slabukha,Konstantin Kurgin

doi:10.1051/e3sconf/202128101038

Victor L Shchutskiy , Alik Blyagoz + Show 3 more

Open Access

https://doi.org/10.1051/e3sconf/202128101038

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Abstract

A numerical experiment was carried out to study rigidity, critical force, and bearing capacity of reinforced concrete racks with annular section under short-term and long-term loading. The effect of long-term loading was estimated in the numerical experiment by changing the coefficient φl from 1 to 1.8 times 0.2, as well as the modulus of deformations Eb,τ, taking into account the operating conditions (W = 40-75%). At the same time, the external load on the rack N was taken in the experiments as a multiple of the critical force Ncr from 0.2 to 1.0, and the relative eccentricity δe of the load application varied from 0.15 to 1.35, which made it possible to estimate the stress state of the struts in an extended range of possible loadings. The results obtained made it possible to identify qualitative and quantitative regularities of rigidity changes, critical force and bearing capacity of annular struts during short-term and long-term load application.

Highlights

Investigation on the centrifuged concrete properties, the strength and deformability of reinforced concrete structures of annular section, are devoted to the works of I.N
In this work, which is a continuation of the previous studies [8,9,10], the results of a numerical experiment on the study of the bearing capacity, bending rigidity and the critical force of annular struts under short-term and long-term loads are presented
In a numerical experiment to expand the field of possible loadings of the strut, the change in rigidity D and critical force Ncr was investigated for the short-term and long-term loading, depending on the relative eccentricity δδee = 0,15-1,35

Summary

Introduction

Investigation on the centrifuged concrete properties, the strength and deformability of reinforced concrete structures of annular section, are devoted to the works of I.N. The research results of these authors were used as the basis for calculating the structures of the annular section according to the SNiP 2. The methodology for calculating such structures in the new standards BC 63.13330.2018 [7] has not undergone significant changes. We analyzed in detail some features of the calculation according to the new standards in [8]. It should be noted that most of the above-mentioned studies, including ours [8, 10], were based on the results of the short-term loads’ impact on structures. Insufficient attention has been paid to the study of the long-term loadings influence on the operation of structures with an annular section

Main part

D Concrete

Conclusion