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Influence of random character of reinforcement cover in bending elements

Katarzyna Sieńkowska Lidia Buda-Ożóg

Archives of Civil Engineering | 2021 | vol. 67 | No 4 | 123-137 | DOI: 10.24425/ace.2021.138490

Keywords reinforced structures reliability index bending FEM analysis FORM method Monte Carlo simulation

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Abstract

The paper presents the assessment of reliability depending on the reinforcement cover thickness for elements subject to bending. Based on the experimental tests of 12 reinforced concrete beams subjected to four-point bending the numerical model was validated. In the next steps this numerical model was used for the Monte Carlo simulation. During the analyses the failure probability and the reliability index were determined by two methods – using probabilistic method –FORMand fully probabilistic method Monte Carlo with the use of variance reduction techniques by Latin hypercube sampling (LHS). The random character of input data – compressive strength of concrete, yield strength of steel and effective depth of reinforcement were assumed in the analysis. Non-parametric Spearman rank correlation method was used to estimate the statistical relationship between random variables. Analyses have shown a significant influence of the random character of effective depth on reliability index and the failure probability of bending elements.

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Bibliography

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[2] L. Buda-Ozóg, “Diagnostics of technical condition of concrete elements using dynamic methods”, PhD thesis, Rzeszow University of Technology, Poland 2008 (in Polish).
[3] L. Buda-Ozóg, K. Sienkowska, and I. Skrzypczak, “Reliability of beams subjected to torsion designed using STM”, Archives of Civil Engineering, vol. 66, no. 3, pp. 555–573, 2020. DOI: 10.24425/ace.2020.134413.
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[14] I. Skrzypczak, L. Buda-Ozóg, and M. Słowik, “Projektowanie elementów żelbetowych z założoną niezawodnością”, Czasopismo Inżynierii Lądowej, Środowiska i Architektury, vol. 61, no 3/II, pp. 503–510, 2014, DOI: 10.7862/rb.2014.116.
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Authors and Affiliations

Katarzyna Sieńkowska

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Lidia Buda-Ożóg

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Rzeszów University of Technology, Faculty of Civil and Environmental Engineering and Architecture, Powstancow Warszawy 12, 35-859 Rzeszów, Poland

Reliability of Beams Subjected to Torsion Designed Using STM

Lidia Buda-Ożóg Katarzyna Sieńkowska Izabela Skrzypczak

Archives of Civil Engineering | Vol. 66 | No 3 | 555-573 | DOI: 10.24425/ace.2020.134413

Keywords strut ad tie model torsion reinforced concrete beam reliability

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Abstract

This paper presents probabilistic assessment of load-bearing capacity and reliability for different STM of beams loaded with a torsional and bending moment. Three beams having different reinforcement arrangement obtained on the basis of STM but the same overall geometry and loading pattern were analysed. Stochastic modelling of this beams were performed in order to assess probabilistic load-bearing capacity. In the analysis, the random character of input data - concrete and steel was assumed. During the randomization of variables the Monte Carlo simulation with the reduce the number of simulations the Latin Hypercube Sampling (LHS) method was applied. The use of simulation methods allows for approximation of implicit response functions for complex in description and non-linear reinforced concrete structures. On the basis of the analyses and examples presented in the paper, it has been shown that the adoption of different ST models determines the different reliability of the analysed systems and elements.

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Authors and Affiliations

Lidia Buda-Ożóg

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Katarzyna Sieńkowska

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Izabela Skrzypczak

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Influence of the tie reinforcement on the development of a collapse caused by the failure of an edge column in RC flat slab system

Lidia Buda-Ożóg Joanna Zięba Katarzyna Sieńkowska Damian Nykiel

Archives of Civil Engineering | 2023 | vol. 69 | No 1 | 39-54 | DOI: 10.24425/ace.2023.144158

Keywords reinforcement tie reinforcement progressive failure edge column RC flat slab system deformation

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Abstract

RC flat slabs are one of the most popular and effective methods of shaping plates in buildings. Although failures of entire structures are relatively rare, they cannot be excluded from the occupancy cycle of the facility. The research analysis presented in this paper is an attempt to understand more precisely the phenomena that occur in the RC flat slab system and to assess the influence of the additional protection of the flat slabs against progressive collapse in the case of failure of one of the supports. The results were obtained from destructive experimental investigations of a flat reinforced concrete slab made in scale 1:3. The collapse in the analysed model was simulated by removing three edge columns and additional loading by means of hydraulic actuator. In place of the columns removed, differential tie reinforcement was applied. The results obtained confirm that the structure achieved a much higher ultimate load than the one resulting from the design calculations.

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Authors and Affiliations

Lidia Buda-Ożóg

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Joanna Zięba

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Katarzyna Sieńkowska

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Damian Nykiel

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Department of Building Structures, Faculty of Civil Engineering and Environmental Engineering, Rzeszow University of Technology, Poznańska 2, Rzeszow 35-084, Poland

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Influence of random character of reinforcement cover in bending elements

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Authors and Affiliations

Reliability of Beams Subjected to Torsion Designed Using STM

Abstract

Authors and Affiliations

Influence of the tie reinforcement on the development of a collapse caused by the failure of an edge column in RC flat slab system

Abstract

Authors and Affiliations