Overall Reliability of the Concrete Columns in Case of Stability Loss

Benko, Vladimír; Kendický, Peter; Krizma, Martin; Kišac, Marián; Beleš, Ivan

doi:10.4028/www.scientific.net/amr.1106.229

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…As a part of the preparation of the experiment, we had asked numerous experts around Europe to predict the behaviour of the column during the test with the nonlinear method. A similar prediction was also performed [7] in the previous research [4], [5]. The aim of this prediction was to ask experts with experiences for their results.…”

Section: Prediction Of the Experimental Behaviourmentioning

confidence: 90%

Experimental Verification of Slender Reinforced Concrete Columns Design

Dobrý

Benko

Kováčik

et al. 2021

SSP

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The columns have been part of the constructions since the beginning of the buildings and have retained their design and construction importance to the present. The advantage of using more slender elements are less material consumption and more usable space in the interiors. The continuous improvement of the building materials and the use of hybrid structural elements leads to the downsizing of the structural elements. The aim of this article is the nonlinear analysis of the slender rein-forced concrete columns and the loss of stability verified by the experimental tests. Nonlinear calculations can be considered as the most accurate calculation option for the load bearing structural elements. On the other hand, the effect of the “black box” has been, and will be the cause of a large number of building defects. In the Eurocode 2 in chapter 5.8.6 of the European Concrete Design Standard, there is a possibility of using the general nonlinear method in practice, even for the com-pressed elements. In the design of the slender structures, the influence of second-order theory is a very important part of the design. In this publication are described theoretical and experimental analyses of the slender columns, that failed due to loss of stability inside of their design interaction diagram - much sooner than the critical cross-sections reached its resistance. As a part of the experimental preparations, reinforced concrete columns were designed, based on numerous numerical analyses. Later, the chosen columns were tested in the laboratories of TU Wien in Vienna. Experimental verification is one of the main parts of my dissertation thesis.

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Section: Prediction Of the Experimental Behaviourmentioning

confidence: 90%

Experimental Verification of Slender Reinforced Concrete Columns Design

Dobrý

Benko

Kováčik

et al. 2021

SSP

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“…Second order effect can be very large due to increase of eccentricity, so the stability failure of compressed concrete members can occur inside the design interaction diagram M-N of a cross-section much earlier than design resistance in critical crosssection is reached (force N Rd(c) in Fig. 1) [3,4,5,6]. Using the general non-linear analysis [7,8], as defined in [1] clause 5.7 (4) P "the use of material characteristics which represents the stiffness in a realistic way but takes account of the uncertainties of failure, shall be used when using non-linear analysis" demands to use mean values of the material properties.…”

Section: Stability Failure Of Compressed Concrete Columnsmentioning

confidence: 99%

Experimental Analysis of Slender Concrete Columns at the Loss of Stability

Kendický¹,

Benko²,

Gúcky³

2016

SSP

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The use of non-linear methods for design of slender concrete columns by European standards. For the verification of non-linear design methods it is important to compare their results with results of experiments. Within the applied research of the Faculty of Civil Engineering at Slovak University of Technology in Bratislava in cooperation with the company ZIPP Bratislava LTD the experimental verification of the slender reinforced concrete columns was realized. In the paper the authors present the preparation and process one of three series of slender reinforced concrete columns, which were made to verify the reliability of various design methods. Columns of planned second series were designed from high performance concrete C100/115, but the material tests showed that the strength class of concrete was C70/85. The columns, subjected to axial force and bending moment were designed to fail due to loss of stability before the resistance of the critical cross-section is reached. The expected compressive strain in concrete was 1,5 ‰.

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“…Die Bestimmung des charakteristischen Werts aus den Versuchsergebnissen sowie die direkte Bestimmung des Bemessungswerts erfolgten mit einem FORM‐Sensitivitätsfaktor auf der Widerstandsseite von α R = 0,8 und einem Zielwert des Zuverlässigkeitsindex von β = 4,7. Vergleich zwischen Bemessungsverfahren nach [1] siehe auch [23–25].…”

Section: Vergleich Mit Normativen Verfahrenunclassified

Tragkapazität schlanker Druckglieder

Strauß¹,

Eschbacher²,

Kendický

et al. 2015

Beton und Stahlbetonbau

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Load capacity of slender compression members Part 1: Component tests and round robin test of the nonlinear numerical prediction of system behavior Non-linear calculation methods allow a realistic description of the physically caused complex load-deformation behavior of reinforced concrete structures and suggest in comparison of proven approximate methods a more accurate design in both ultimate and serviceability limit states. Especially the geometrically and materially nonlinear analysis of slender compression members in the ultimate limit state is, however, still controversial because of the known inconsistencies in the design concept, which is why, despite the in EN 1992-1-1 explicitly granted ability to use non-linear methods, further research is needed. The following paper compares an a priori carried out round robin test of numerical simulations to predict the load capacity of a slender single column with an a posteriori conducted test series. The results show that the numerical calculations overestimate the load capacity in some cases significantly but, however, the widely accepted and normatively governed nominal curvature method yields in these cases to too conservative results. It will be necessary to develop universal and consistent safety formats for non-linear analysis and provide "best practice" guidelines to ensure the safe use of the now widely available software packages.

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Overall Reliability of the Concrete Columns in Case of Stability Loss

Cited by 4 publications

References 5 publications

Experimental Verification of Slender Reinforced Concrete Columns Design

Experimental Verification of Slender Reinforced Concrete Columns Design

Experimental Analysis of Slender Concrete Columns at the Loss of Stability

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