Simulation of Severe Accident Scenarios in Nuclear Containments

Červenka, J; Janda, Zdenek; Jendele, Libor; Pukl, Radomír; Červenka, Vladimír

doi:10.1016/j.proeng.2017.11.097

Cited by 8 publications

(11 citation statements)

References 7 publications

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“…This paper is focused on evaluation of 2D and 3D FEM models of modified CT test, specimen size XL and configurations A, B and C, with initiation notch of length α = 0.5 (α = a´/W´). For assembling of these models and the FEM analysis of their response the 2D and 3D versions respectively, the ATENA software was used [6]. This software was developed to perform nonlinear analysis of structures based on the FEM and include a tool specifically designed for simulation of the quasi-brittle fracture.…”

Section: Atena Modelsmentioning

confidence: 99%

Modelling of Modified Compact Tension Test of Fine-Grained Cement-Based Concrete Specimens Using FEM Software

Klon

Sobek

Keršner

2017

KEM

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The paper discusses creation of numerical models of the modified Compact Tension (CT) test configuration on specimens made of fine-grained cement composite. Numerical models of this test configuration are used for predictions of crack initiation and damage propagation and are important for the further evaluation of fracture parameters. To assemble the numerical models, ATENA FEM software was used. In this software, fracture of the structure/specimen caused by cracks, their initiation and progressive propagation throughout the loading process, can be modelled. In case of this study the material model for concrete based on cohesive law approach was used. The analysis is focused on evaluation of 2D and 3D numerical models created with real material properties obtained from experimental data.

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Section: Atena Modelsmentioning

confidence: 99%

Modelling of Modified Compact Tension Test of Fine-Grained Cement-Based Concrete Specimens Using FEM Software

Klon

Sobek

Keršner

2017

KEM

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“…For the material model Concrete EC2-CC3DNonLinCementitious 2, this law is given by the Hordijk [21] softening function presented in Figure 2a, where σ is the tensile stress, w is the crack opening, f t ef is the effective tensile stress and w c is the crack opening value when σ = 0. The compressive behaviour of concrete is determined by a Hardening/Softening Plasticity Model based on Menetrey-William [22] failure surface and is represented in ATENA by Fictitious Compression Plane Model [23]. The uniaxial stress-strain law has a linear descending branch, where the value of post-peak plastic displacement due to compression (wd) is an input parameter.…”

Section: Constitutive Modelsmentioning

confidence: 99%

“…This is an isoparametric element integrated by Gauss integration at integration points. Interpolation functions for all variants of the elements are given in Cervenka et al [23]. The constant part of initial moisture value considered on the numerical model was 0,9728.…”

Section: Numerical Modellingmentioning

confidence: 99%

Parametric analysis of thermomechanical behavior of reinforced concrete slabs with different aggregates in fire

Fanton,

Almeida,

Trautwein

2024

Rev. IBRACON Estrut. Mater.

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Reinforced concrete structures, when subjected to fire, have their mechanical resistance reduced related to the behavioral change of the material. Many experimental and numerical research on the behavior of concrete exposed to fire have been carried out on beams and columns, with slabs being studied less frequently, mainly due to its size and consequently higher research costs. This paper carried out a numerical analysis of the thermomechanical behavior of reinforced concrete slabs exposed to fire, using finite element modeling. The parametric analysis carried out changing the aggregate type of concrete showed that when exposed to ISO834 fire curve, the displacement in the center of slab with siliceous aggregate was 47% higher than the slab with calcareous aggregate. Analyzing the crack opening, for slabs exposed to ISO834 fire curve, the first 1mm-cracks were noticed at 18min when using calcareous aggregate, while the slabs with siliceous aggregate started at 13min.

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“…Local material damages causing nonlinear response of the structure to the acting load are modelled by means of the nonlinear finite element software ATENA [30][31] developed by Červenka Consulting s.r.o. This software includes elite material models for the basic materials -concrete and reinforcing steel.…”

Section: Nonlinear Computational Modellingmentioning

confidence: 99%

Nonlinear probabilistic structural assessment: Findings from Austrian and Czech bridges

Novák,

Strauss,

Novák

et al. 2023

ce papers

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Consideration of uncertainties in bridge structural engineering is a growing topic because it provides valuable information on the reliability of bridges in time while addressing life‐cycle aspects. Utilization of nonlinear finite element method (NLFEM) and Monte Carlo (MC) type simulation is essential for modelling of the concrete bridge random behaviour and its reliability assessments. This contribution describes keystones of a complex methodology for statistical, reliability and risk analyses of concrete structures including advanced nonlinear finite element analysis, uncertainty propagation and degradation modelling. It presents virtual simulation used on the way from assessment of experimental results to reliability analysis of a bridge structure, based on randomization of nonlinear fracture mechanics finite element analysis. Keystones of complex methodology are material parameters identification, nonlinear computational modelling, uncertainties propagation, surrogate modelling, degradation modelling, and safety formats. The paper describes methodology and for a routine complex assessment utilizing developed software tools and practical application of the approach for selected case studies of concrete bridges from Austria and the Czech Republic.

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Simulation of Severe Accident Scenarios in Nuclear Containments

Cited by 8 publications

References 7 publications

Modelling of Modified Compact Tension Test of Fine-Grained Cement-Based Concrete Specimens Using FEM Software

Modelling of Modified Compact Tension Test of Fine-Grained Cement-Based Concrete Specimens Using FEM Software

Parametric analysis of thermomechanical behavior of reinforced concrete slabs with different aggregates in fire

Nonlinear probabilistic structural assessment: Findings from Austrian and Czech bridges

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