DOProC-based reliability assessment of steel structures exposed to fatigue

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F16%3A00467519" target="_blank" >RIV/68081723:_____/16:00467519 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.pisc.2015.11.037" target="_blank" >http://dx.doi.org/10.1016/j.pisc.2015.11.037</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.pisc.2015.11.037" target="_blank" >10.1016/j.pisc.2015.11.037</a>

Jazyk výsledku

angličtina

Název v původním jazyce

DOProC-based reliability assessment of steel structures exposed to fatigue

Popis výsledku v původním jazyce

Fatigue crack damage depends on a number of stress range cycles. This is a time factor in the course of reliability for the entire designed service life. The failure rate increases in the course of time and the reliability decreased. If possible propagation of the fatigue crack is included into the failure rate, it is necessary to investigate into the fatigue crack and define the maximum acceptable degradation. Three sizes are important for the characteristics of the propagation of fatigue cracks. These are the initial size, detectable size and acceptable size. The theoretical model of fatigue crack progression is based on a linear fracture mechanics.A tension flange has been chosen for applications of the theoretical solution suggested in the studies. Depending on location of an initial crack, the crack may propagate from the edge or from the surface. Regarding the frequency, weight and stress concentration, those locations rank among those with the major hazard of fatigue cracks appearing in the steel structures and bridges. When determining the required degree of reliability, it is possible to specify the time of the first inspection of the construction which will focus on the fatigue damage. Using a conditional probability, times for subsequent inspections can be determined.nFor probabilistic calculation of fatigue crack progression was used the original and new probabilistic methods – the Direct Optimized Probabilistic Calculation (“DOProC), which uses a purely numerical approach without any simulation techniques. By means of FCProbCalc (which stands for Fatigue Crack Probability Calculation), it is possible to carry out the probabilistic modelling of propagation of fatigue cracks in a user friendly environment and to propose a system of regular inspections which should reveal damage to the structure, using the described computational procedures.

Název v anglickém jazyce

DOProC-based reliability assessment of steel structures exposed to fatigue

Popis výsledku anglicky

Fatigue crack damage depends on a number of stress range cycles. This is a time factor in the course of reliability for the entire designed service life. The failure rate increases in the course of time and the reliability decreased. If possible propagation of the fatigue crack is included into the failure rate, it is necessary to investigate into the fatigue crack and define the maximum acceptable degradation. Three sizes are important for the characteristics of the propagation of fatigue cracks. These are the initial size, detectable size and acceptable size. The theoretical model of fatigue crack progression is based on a linear fracture mechanics.A tension flange has been chosen for applications of the theoretical solution suggested in the studies. Depending on location of an initial crack, the crack may propagate from the edge or from the surface. Regarding the frequency, weight and stress concentration, those locations rank among those with the major hazard of fatigue cracks appearing in the steel structures and bridges. When determining the required degree of reliability, it is possible to specify the time of the first inspection of the construction which will focus on the fatigue damage. Using a conditional probability, times for subsequent inspections can be determined.nFor probabilistic calculation of fatigue crack progression was used the original and new probabilistic methods – the Direct Optimized Probabilistic Calculation (“DOProC), which uses a purely numerical approach without any simulation techniques. By means of FCProbCalc (which stands for Fatigue Crack Probability Calculation), it is possible to carry out the probabilistic modelling of propagation of fatigue cracks in a user friendly environment and to propose a system of regular inspections which should reveal damage to the structure, using the described computational procedures.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JL - Únava materiálu a lomová mechanika

OECD FORD obor

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Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Perspectives in Science

ISSN

2213-0209

e-ISSN

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Svazek periodika

7

Číslo periodika v rámci svazku

MARCH

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

228-235

Kód UT WoS článku

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EID výsledku v databázi Scopus

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