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    Wyświetlanie 1-4 z 4
    Tytuł:
    Probability distribution functions for service loads of frame scaffoldings
    Autorzy:
    Błazik-Borowa, Ewa
    Pieńko, Michał
    Szer, Iwona
    Hoła, Bożena
    Czarnocki, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2128143.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    scaffoldings
    service load
    extreme events
    probability distribution function
    safety
    rusztowanie
    obciążenie usługi
    zdarzenia ekstremalne
    funkcja rozkładu prawdopodobieństwa
    bezpieczeństwo
    Opis:
    The paper discusses service load measurements (weight of construction materials, small equipment and workers) conducted on 120 frame scaffoldings all over Poland in 2016‒2018. Despite the fact that the scaffolding should ensure the safety of its users, most accidents on construction sites are caused by fall from height. Service loads are one of the elements affecting the safety of scaffolding use. On the basis of the studies, maximum load on one platform and maximum load on a vertical scaffolding module for one day were obtained. They were treated as the random variables of the maximum values. Histograms and probability density functions were determined for these variables. The selection of a probability distribution consisted in the selection of a probability density function by means of fitting curves to the study result histograms using the method of least squares. The analysis was performed for distribution Weibull and Gumbel probability density functions which are applied for maximum values of random variables. Parameters of these functions can be used for the purposes of the reliability analysis to calibrate partial safety factors in simulation of service load during the scaffolding failure risk assessment. Besides, the probability of not exceeding the standard loads provided for frame scaffoldings for 120 weeks was established on the aforementioned basis. The results of the presented research show that in Poland there is a high probability of exceeding the permissible service loads in one year and thus there is a high risk of scaffolding damage.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136734, 1--10
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probability distribution functions for service loads of frame scaffoldings
    Autorzy:
    Błazik-Borowa, Ewa
    Pieńko, Michał
    Szer, Iwona
    Hoła, Bożena
    Czarnocki, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2173610.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    scaffoldings
    service load
    extreme events
    probability distribution function
    safety
    rusztowanie
    obciążenie usługi
    zdarzenia ekstremalne
    funkcja rozkładu prawdopodobieństwa
    bezpieczeństwo
    Opis:
    The paper discusses service load measurements (weight of construction materials, small equipment and workers) conducted on 120 frame scaffoldings all over Poland in 2016‒2018. Despite the fact that the scaffolding should ensure the safety of its users, most accidents on construction sites are caused by fall from height. Service loads are one of the elements affecting the safety of scaffolding use. On the basis of the studies, maximum load on one platform and maximum load on a vertical scaffolding module for one day were obtained. They were treated as the random variables of the maximum values. Histograms and probability density functions were determined for these variables. The selection of a probability distribution consisted in the selection of a probability density function by means of fitting curves to the study result histograms using the method of least squares. The analysis was performed for distribution Weibull and Gumbel probability density functions which are applied for maximum values of random variables. Parameters of these functions can be used for the purposes of the reliability analysis to calibrate partial safety factors in simulation of service load during the scaffolding failure risk assessment. Besides, the probability of not exceeding the standard loads provided for frame scaffoldings for 120 weeks was established on the aforementioned basis. The results of the presented research show that in Poland there is a high probability of exceeding the permissible service loads in one year and thus there is a high risk of scaffolding damage.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136734
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of the statistical model failure of orthotropic composite materials
    Autorzy:
    Kvit, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/24201506.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    stochasticity
    probability of failure
    orthotropic composite material
    failure loading
    integral probability distribution function
    stochastyczność
    prawdopodobieństwo uszkodzenia
    ortotropowy materiał kompozytowy
    całkowa funkcja rozkładu prawdopodobieństwa
    Opis:
    A composite plate (matrix and reinforcing elements) under conditions of plane deformation is considered. According to the elastic properties, the material of the plate is considered orthotropic with uniformly distributed defects-cracks that do not interact with each other. The geometric characteristics of defects are statistically independent random variables – the half-length and the orientation angle between the defect line and the axis of orthotropy with a larger Young’s modulus. The ratio for the failure loading integral probability distribution function of the composite was obtained. The dependencies of the researched composite probability of failure (reliability) for the different number of cracks (plate sizes), different types of loading and various values of the exponential distribution parameter are calculated and investigated graphically.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2023, 22, 2; 26--35
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Derivation of Equations for a Size Distribution of Spherical Particles in Non-Transparent Materials
    Autorzy:
    Gurgul, Daniel
    Burbelko, Andriy
    Wiktor, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2056033.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    planimetric analysis
    linear analysis
    estimation of diameter sizes distribution
    probability density function
    analiza planimetryczna
    analiza liniowa
    szacowanie rozkładu wielkości średnic
    funkcja gęstości prawdopodobieństwa
    Opis:
    This paper presents a new proposition on how to derive mathematical formulas that describe an unknown Probability Density Function (PDF3) of the spherical radii (r3) of particles randomly placed in non-transparent materials. We have presented two attempts here, both of which are based on data collected from a random planar cross-section passed through space containing three-dimensional nodules. The first attempt uses a Probability Density Function (PDF2) the form of which is experimentally obtained on the basis of a set containing two-dimensional radii (r2). These radii are produced by an intersection of the space by a random plane. In turn, the second solution also uses an experimentally obtained Probability Density Function (PDF1). But the form of PDF1 has been created on the basis of a set containing chord lengths collected from a cross-section. The most important finding presented in this paper is the conclusion that if the PDF1 has proportional scopes, the PDF3 must have a constant value in these scopes. This fact allows stating that there are no nodules in the sample space that have particular radii belonging to the proportional ranges the PDF1.
    Źródło:
    Journal of Casting & Materials Engineering; 2021, 5, 4; 53--60
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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