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Probability distribution functions for service loads of frame scaffoldings

Ewa Błazik-Borowa Michał Pieńko Iwona Szer Bożena Hoła Krzysztof Czarnocki
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 2 | e136734 | DOI: 10.24425/bpasts.2021.136734
Keywords scaffoldings service load extreme events probability distribution function safety
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Abstract

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.
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Authors and Affiliations

Ewa Błazik-Borowa
1
ORCID: ORCID
Michał Pieńko
1
ORCID: ORCID
Iwona Szer
2
ORCID: ORCID
Bożena Hoła
3
ORCID: ORCID
Krzysztof Czarnocki
4
ORCID: ORCID
  1. Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland
  2. Faculty of Civil Engineering, Architecture and Environmental Engineering, Lodz University of Technology, Politechniki 6, 90-924 Łódz, Poland
  3. Faculty of Civil Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
  4. Faculty of Management, Lublin University of Technology, Nadbystrzycka 38, 20-618 Lublin, Poland

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