Analysis of scaffolding harmonic excitation

• Autorzy: Bęc Jarosław , Błazik-Borowa Ewa , Szer Jacek

Identyfikatory

DOI

10.24425/bpasts.2023.144577

• Języki publikacji: EN

Abstrakty

EN

Scaffolding is equipment usually used at construction sites. A scaffolding structure is lightweight and made of elements used many times. The characteristics of scaffolding make it susceptible to dynamic actions present at the structure or occurring nearby. A scaffolding structure of medium size was subjected to analysis in this paper. The structure FEM model was loaded with single force harmonic excitation with various frequencies ranging from 1 Hz to 12 Hz applied in one of many selected points on the scaffolding façade. In the first step, natural frequencies and mode shapes of the analyzed structure were calculated. Then the full dynamic analysis was carried out to obtain maximum displacements of selected control points. The relation of excitation force frequency and location to the amplitudes of generated displacement was observed. It was found that low excitation frequencies close to the natural frequencies of the structure produced vibrations ranging to large areas of the scaffolding surface. Higher excitation frequencies are usually less propagated at the scaffolding but still may produce some discomfort to the structure users in the vicinity of the excitation force location. Scaffolding is equipment usually used at construction sites. A scaffolding structure is lightweight and made of elements used many times. The characteristics of scaffolding make it susceptible to dynamic actions present at the structure or occurring nearby. A scaffolding structure of medium size was subjected to analysis in this paper. The structure FEM model was loaded with single force harmonic excitation with various frequencies ranging from 1 Hz to 12 Hz applied in one of many selected points on the scaffolding façade. In the first step, natural frequencies and mode shapes of the analyzed structure were calculated. Then the full dynamic analysis was carried out to obtain maximum displacements of selected control points. The relation of excitation force frequency and location to the amplitudes of generated displacement was observed. It was found that low excitation frequencies close to the natural frequencies of the structure produced vibrations ranging to large areas of the scaffolding surface. Higher excitation frequencies are usually less propagated at the scaffolding but still may produce some discomfort to the structure users in the vicinity of the excitation force location.

Słowa kluczowe

EN

scaffolding; harmonic excitation; dynamic analysis; direct integration

PL

rusztowanie; wzbudzenie harmoniczne; analiza dynamiczna; integracja bezpośrednia

• Wydawca: Polska Akademia Nauk, Wydział IV Nauk Technicznych
• Czasopismo: Bulletin of the Polish Academy of Sciences. Technical Sciences
• Rocznik: 2023
• Tom: Vol. 71, nr 1
• Strony: art. no. e144577
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Bęc Jarosław

• Faculty of Civil Engineering and Architecture, Lublin University of Technology, Poland

• https://orcid.org/0000-0002-5853-3710

autor

Błazik-Borowa Ewa

• Faculty of Civil Engineering and Architecture, Lublin University of Technology, Poland

• https://orcid.org/0000-0001-8200-3827

autor

Szer Jacek

• Faculty of Civil Engineering, Architecture and Environmental Engineering, Lodz University of Technology, Poland

• https://orcid.org/0000-0002-7830-2952

Bibliografia

• [1] J. Bęc and E. Błazik-Borowa, “Dynamic properties of façade-frame scaffoldings,” MATEC Web Conf., vol. 285, p. 00001, 2019, doi: 10.1051/matecconf/201928500001.
• [2] E. Błazik-Borowa and J. Bęc, “Influence of dynamic properties on scaffoldings safety,” Arch. Civ. Mech. Eng., vol. 21, no. 4, p. 144, Dec. 2021, doi: 10.1007/s43452-021-00295-3.
• [3] J. Bec, E. Blazik-Borowa, P. Jaminska-Gadomska, and T. Lipecki, “Vibrational characteristics of façade frame scaffoldings,” Arch. Civ. Eng., vol. 66, no. 3, pp. 467–484, 2020, doi: 10.24425/ace. 2020.134408.
• [4] J. Jia, Essentials of Applied Dynamic Analysis, no. 1215. Springer Berlin, Heidelberg, 2014, doi: 10.1007/978-3-642-37003-8.
• [5] N.J. Mansfield, Human response to vibration. Boca Raton, FL: CRC Press, 2005.
• [6] Y. Matsumoto and M.J. Griffin, “Dynamic response of the standing humanbody exposed to vertical vibration: influence of posture and vibrationmagnitude,” J. Sound Vib., vol. 212, no. 1, pp. 85–107, 1998, doi: 10.1006/jsvi.1997.1376.
• [7] T. Lipecki, P. Jamińska-Gadomska, and E. Błazik-Borowa, “Windload on façade scaffolding without protective cover – Eurocode andin-situ measurement approaches,” J. Build. Eng., vol. 42, p. 102516, Oct. 2021, doi: 10.1016/J.JOBE.2021.102516.
• [8] T. Lipecki, P. Jamińska-Gadomska, J. Bęc, and E. Błazik-Borowa, “Façade scaffolding behaviour under wind action,” Arch. Civ. Mech. Eng., vol. 20, no. 1, p. 27, Mar. 2020, doi: 10.1007/S43452-020-00034-0.
• [9] P. Jamińska-Gadomska, Analiza oddziaływania wiatru na układ budynek-rusztowanie. Wydawnictwo Politechniki Lubelskiej, 2020.
• [10] P. Cyniak, E. Błazik-Borowa, J. Szer, T. Lipecki, and I. Szer, “Thechoice of boundary conditions and mesh for scaffolding FEM model on thebasis of natural vibrations measurements,” in AIP Conference Proceedings, Jan. 2018, vol. 1922, no. 1, p. 150002, doi: 10.1063/1.5019155.
• [11] P. Jamińska-Gadomska, J. Bęc, T. Lipecki, and A. Robak, “Verification of the façade scaffolding computer model,” Arch. Civ. Eng., vol. 64, no. 1, pp. 467–484, 2018, doi: 10.2478/ace-2018-0003.

Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).