Probabilistic safety assessment to determine the seismic fragility of NPP

Králik, Juraj

doi:10.1051/matecconf/202031300015

MATEC Web Conf.

2020

DOI: 10.1051/matecconf/202031300015

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Probabilistic safety assessment to determine the seismic fragility of NPP

Juraj Králik

Abstract: This paper gives the results of the probabilistic analysis of the seismic resistance of nuclear power plant (NPP) structures. The seismic probabilistic safety assessment based on the requirements of the agency IAEA and US NRC are presented. On the base of the geophysical and seismological monitoring of locality the peak ground acceleration and the spectrum of the acceleration was defined for the return period 104 years. There is showed summary of calculation models and calculation methods for the probability a… Show more

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Cited by 3 publications

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Stochastic-Based Reliability Analysis of Stainless-Steel Beams Under Bending

Puklický

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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The presented article studies the bending resistance of a stainless steel hot-rolled profile UPE 80, which is stressed by bending around the minor principal axis. Resistance is studied as the random output variable, which is a function of input material and geometric characteristics. The paper deals with the stochastic analysis of this static resistance. The computational model is created on the basis of the finite element method using geometric and materially nonlinear solution. The Ansys software with 4-node Shell 181 element is used. The input random variables of the stainless steel are taken from previous research aimed at identifying the material mechanical properties based on experimental research of austenitic chromium-nickel stainless steel 1.4307/AISI 304 L. Statistical analysis is performed using the Latin Hypercube Sampling method. The probability of achieving standard design resistance is estimated and compared with the reliability level in standard EN1990 given by the reliability factor beta 3.8. The article discusses the need for a larger number of samples for reliable estimates of design resistances and for the verification of partial reliability factors, which are a challenge for further research.

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Stochastic-Based Reliability Analysis of Stainless-Steel Beams Under Bending

Puklický

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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Global Sensitivity Analysis of Ultimate Limit States of Stainless Steel Structural Members

Omishore

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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The article presents global Sobol sensitivity analysis of a rolled member in tension made from austenitic chromium-nickel stainless steel of type 1.4307/AISI 304 L. The statistical characteristics of yield strength and of the geometry of the rolled steel IPE cross-section are presented on the basis of published experimental research. The sensitivity analysis showed the dominant effect of the yield strength on the static resistance. The second dominant variable is the flange thickness. Higher-order sensitivity indices oriented at detecting the presence of interaction effects between input variables are very small. The characteristics of other types of sensitivity analyses oriented at quantiles or the probability of failure are discussed, especially in terms of a higher proportion of higher-order sensitivity indices. The results of Sobol sensitivity analysis of stainless steel are compared with similar results of carbon steels.

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Role of Subgrade Reaction Modulus in Soil-Foundation-Structure Interaction in Concrete Buildings

et al. 2022

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One of the key issues in structural and geotechnical engineering is that most parts of buildings are usually analysed separately and then the outputs are used in foundation designs. In this process, some effects are neglected. In this study, the soil–structure interaction (SSI) in foundations of concrete buildings was evaluated using the direct finite element method (DFEM). 3D models were developed and used to analyse concrete buildings with different stories constructed on soft soil. Foundation settlement, deformation of foundation, soil pressure diagram, and weight of reinforcement in the foundation were considered as the main parameters. Deformation of the foundation was analysed using the finite element method considering the effect of combined loadings (combinations of dead load, live load, and earthquake load). It is shown that by changing values of subgrade reaction modulus (Ks) in foundation design, the effects of SSI on tall buildings can be considered automatically. The results also show that the soil–structure interaction can cause changes in the pattern of foundation settlement, foundation deformation, and the weight of reinforcement used in foundation design. Furthermore, dishing deformation in foundation appeared in terms of SSI effects. An equation is provided to simplify considering SSI effects in foundation design. This method is practical for civil (especially structural) engineers, and they can conveniently consider these effects in foundation design without using DFEM.

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Probabilistic safety assessment to determine the seismic fragility of NPP

Cited by 3 publications

References 6 publications

Stochastic-Based Reliability Analysis of Stainless-Steel Beams Under Bending

Stochastic-Based Reliability Analysis of Stainless-Steel Beams Under Bending

Global Sensitivity Analysis of Ultimate Limit States of Stainless Steel Structural Members

Role of Subgrade Reaction Modulus in Soil-Foundation-Structure Interaction in Concrete Buildings

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