Calculation Model for Estimation of Residual Bearing Capacity of Damaged Reinforced Concrete Slender Columns

Kos, Željko; Klymenko, Yevhenii; Crnoja, Anđelko; Grynyova, Iryna

doi:10.3390/app12157430

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…Developing methods for strengthening RC structures requires the improvement of calculation methodologies. To determine the necessary amount of reinforcement for structures, their residual bearing capacity needs to be known [10,11]. Only by having the exact value of the residual strength is it possible to design economic strengthening of structures.…”

Section: Analysis Of Previous Researchmentioning

confidence: 99%

A Calculation Model for Determining the Bearing Capacity of Strengthened Reinforced Concrete Beams on the Shear

et al. 2023

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This article presents research on the bearing capacity and methods of calculating reinforced concrete beams on the shear without internal shear reinforcement, which are strengthened with a composite FRCM system. The test samples were divided into two series: the first series—control, in which the variable parameter was the shear span (a/d = 2, a/d = 1.5, and a/d = 1); and the second series—reinforced by the FRCM system, without load, and strengthened at different load levels. The method of calculating experimental beams was tested according to the current code and data from the fib report. In this article, recommendations for determining the angle of inclined struts θ, the coefficient of the concrete shear strength CRd,c, and the coefficient of the load level at which strengthening is performed are proposed. The calculation with the these recommendations showed a good convergence of experimental and theoretical data in the 16–29% range, which is a much higher convergence than the calculation without these recommendations.

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Section: Analysis Of Previous Researchmentioning

confidence: 99%

A Calculation Model for Determining the Bearing Capacity of Strengthened Reinforced Concrete Beams on the Shear

et al. 2023

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“…However, the columns failed mainly due to the overall buckling associated with concrete crushing and buckling of steel bars. Kos et al (2022) carried out tests on RC slender columns to study the failure modes and the residual strengths of the damaged columns. A calculation model was proposed to calculate the residual strength of the damaged columns and validated against the test results.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations of precast circular reinforced concrete slender columns with intermediate connection

Hamoda,

Ahmed,

Abadel

et al. 2023

Advances in Structural Engineering

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This paper carries out experimental and numerical investigations on the axial performance of circular Reinforced Concrete (RC) precast slender columns with an intermediate connection. A series of tests are carried out to study the effects of longitudinal reinforcement ratio (ρ), and embedded length of steel bars (Lb) of precast columns on their axial performance under concentric loading. Test results show that increasing the reinforcement ratio and the embedded length of the precast columns significantly improves the axial performance of the precast slender columns. Nonlinear finite element models (FEM) are developed to simulate the performance of the columns experimentally observed. The accuracy of the FEM is validated against the test results and found to reasonably predict the axial performance of tested columns.

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“…These can be technological solutions that allow the creation of buildings and structures, including increased responsibility, through the introduction of new technologies, expensive equipment and digital computer programs [6][7][8][9][10]. However, an interesting approach involves the search for hidden reserves and unexplored areas in those existing types of structures that are known, but so far have not been taken into account in design, calculation and modeling [11][12][13][14][15]. In this regard, such building structures look promising, which are either known and proposed in regulatory and technical documents, proven and reliable building structures, but with a new approach to them through the use of new materials [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Calculation of Improved Centrifuged Reinforced Concrete Columns with Variotropic Structure

et al. 2023

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The use of vibro-centrifugation technology allows the manufacture of variotropic structures that are inhomogeneous in the annular section and have different characteristics along the section thickness. Hardening of the outer layers allows the structure to better resist bending conditions, however, the behavior of the variotropic column under central and eccentric compression remains unexplored. This article considers the problem of compression of hollow columns made of homogeneous concrete that is non-uniform in the annular section (variotropic), and is reinforced with steel reinforcing bars at different values of the load application eccentricity. Variotropic concrete obtained by vibro-centrifugation technology has a stronger outer part and a less durable inner part. The strength of a homogeneous column corresponds to the strength of the middle part of variotropic concrete. The problem was solved numerically in the ANSYS environment for a vertical column rigidly clamped at the bottom edge and loaded with eccentricity at the top edge. Three types of eccentricity are considered; e/r = 0, 0.16 and 0.32 (respectively 0 mm, 0.24 mm and 48 mm). The results of the solution in the form of stress fields, deformations and a pattern of crack development in a spatial setting are obtained. The results showed that for central compression, a homogeneous column has a better bearing capacity of 3.6% than a variotropic one. With the values of eccentricity e/r = 0.16 and 0.32, the variotropic column has a higher bearing capacity (by 5.5% and 6.2%) than the homogeneous one and better resists the development of cracks. The significance of the study lies in the practical application of the proposed approach, developed on a research basis, for non-trivial and complicated operating conditions of columns. This study influences the development of reinforced concrete structures and applies scientific findings to engineering practice.

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Calculation Model for Estimation of Residual Bearing Capacity of Damaged Reinforced Concrete Slender Columns

Cited by 6 publications

References 22 publications

A Calculation Model for Determining the Bearing Capacity of Strengthened Reinforced Concrete Beams on the Shear

A Calculation Model for Determining the Bearing Capacity of Strengthened Reinforced Concrete Beams on the Shear

Experimental and numerical investigations of precast circular reinforced concrete slender columns with intermediate connection

Modeling and Calculation of Improved Centrifuged Reinforced Concrete Columns with Variotropic Structure

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