English
Język Polski
Influence of anchoring and bracing system on dynamic characteristics of façade scaffolding
DOI:
https://doi.org/10.24425/ace.2023.147672Abstract
The basic dynamic characteristics of façade scaffolding are natural frequencies of vibrations and corresponding mode shapes. These properties affect the scaffolding safety, as well as comfort and safety of its users. Many of the dynamic actions present at scaffolding are in the low frequency range, i.e. below 10-15 Hz. The first natural frequency of a structure is usually in the range of 0.7 to 4 Hz which corresponds to resonant frequencies of human body and it means that vibrations induced at scaffolding may strongly affect the human comfort. The easiest way of increasing the rigidity of the structure is by ensuring correct boundary conditions (support, anchorage) and bracing of the structure. The numerical analysis was performed for the real scaffolding structure of medium size. The analysis consisted of natural frequencies calculation for the original structure and for models with modified bracing and anchoring systems. The bracing modifications were introduced by reducing or increasing the number of vertical bracing shafts. The anchor system was modified by reduction of the 6 anchors in the top right corner of the scaffolding in three stages or by evenly removing nearly 1/3 of the total number of anchors. The modifications of bracing and anchor systems resulted in changing the natural frequencies. The increase of natural frequencies due to higher number of anchors and more bracing is not even for all mode shapes. Bracing is more effective in acting against longitudinal vibrations, while anchoring against vibrations perpendicular to the façade.References
[1] J. Jia, Essentials of applied dynamic analysis. Berlin, Heidelberg: Springer, 2014, doi: 10.1007/978-3-642-37003-8.
[2] J. Bęc, E. Błazik-Borowa, P. Jamińska-Gadomska, and T. Lipecki, “Vibrational environment at scaffoldings”, in EEBP8, 2018 – Environmental Effects on Buildings and People, T. Lipecki and A. Flaga, Eds. Cracow-Lublin: Polish Association for Wind Engineering, 2018, pp. 85-86.
[3] J. Bęc, E. Błazik-Borowa, P. Jamińska-Gadomska, and T. Lipecki, “Vibrational characteristics of façade frame scaffoldings”, Archives of Civil Engineering, vol. 66, no. 3, pp. 467-484, 2020, doi: 10.24425/ace.2020.134408.
[4] T. Lipecki, P. Jamińska-Gadomska, J. Bęc, and E. Błazik-Borowa, “Façade scaffolding behaviour under wind action”, Archives of Civil and Mechanical Engineering, vol. 20, no. 1, 2020, doi: 10.1007/S43452-020-00034-0.
[5] T. Lipecki, P. Jamińska-Gadomska, and E. Błazik-Borowa, “Dynamic wind action on façade scaffoldings”, AIP Conference Proceedings, vol. 1922, no. 1, art. no. 110001, 2018, doi: 10.1063/1.5019104.
[6] P. Jamińska, “Analiza działania wiatru na układ budynek z rusztowaniem”, Budownictwo i Architektura, vol. 12, no. 2, pp. 111-118, 2013.
[7] T. Lipecki, P. Jamińska-Gadomska, and E. Błazik-Borowa, “Wind load on façade scaffolding without protective cover – Eurocode and in-situ measurement approaches”, Journal of Building Engineering, vol. 42, art. no. 102516, 2021, doi: 10.1016/J.JOBE.2021.102516.
[8] T. Lipecki, P. Jamińska-Gadomska, E. Błazik-Borowa, and J. Bęc, “Szacowanie oddziaływania wiatru na rusztowanie w świetle badań w skali rzeczywistej”, Fizyka Budowli w Teorii i Praktyce, vol. 9, no. 4, pp. 9-14, 2017.
[9] E. Blazik-Borowa, et al., “Analysis of the load bearing capacity of scaffoldings used in Poland”, IOP Conf Ser Mater Sci Eng, vol. 951, no. 1, doi: 10.1088/1757-899X/951/1/012023.
[10] P. Jamińska-Gadomska, Analiza oddziaływania wiatru na układ budynek-rusztowanie. Wydawnictwo Politechniki Lubelskiej, 2020.
[11] F. Wang, Y. Tamura, and A. Yoshida, “Wind loads on clad scaffolding with different geometries and building opening ratios”, Journal of Wind Engineering and Industrial Aerodynamics, vol. 120, pp. 37-50, 2013, doi: 10.1016/J.JWEIA.2013.06.015.
[12] E. Błazik-Borowa and J. Bęc, “Influence of dynamic properties on scaffoldings safety”, Archives of Civil and Mechanical Engineering, vol. 21, no. 4, art. no. 144, 2021, doi: 10.1007/s43452-021-00295-3.
[13] P. Cyniak, I. Szer, J. Szer, T. Lipecki, and E. Błazik-Borowa, “Wpływ obciążenia dynamicznego na wytężenie konstrukcji rusztowania”, Journal of Civil Engineering, Environment and Architecture, vol. 64, no. 3, pp. 487-497, 2018, doi: 10.7862/rb.2017.140.
[14] M. Pieńko, A. Robak, E. Błazik-Borowa, and J. Szer, “Safety conditions analysis of scaffolding on construction sites”, International Journal of Civil and Environmental Engineering, vol. 12, no. 2, pp. 72-77, 2018.
[15] J. Bęc and E. Błazik-Borowa, “Dynamic properties of façade frame scaffoldings”, MATEC Web of Conferences, vol. 285, art. no. 00001, 2019, doi: 10.1051/matecconf/201928500001.
[16] M. Pieńko, A. Robak, and E. Błazik-Borowa, “Rusztowania budowlane – przepisy a praktyka”, Budownictwo i Architektura, vol. 15, no. 2, pp. 5-12, 2016.
[17] E. Błazik-Borowa, P. Jamińska-Gadomska, and M. Pieńko, “Influence of foundation quality on the stress in the elements of steel façade scaffolding”, Buildings, vol. 10, no. 7, pp. 1-13, 2020, doi: 10.3390/BUILDINGS10070130.
[18] M. Pieńko, A. Robak, and E. Błazik-Borowa, “Scaffoldings used during the renovation of the Metropolitan Cathedral of St. John The Baptist and St. John The Evangelist in Lublin”, Civil And Environmental Engineering Reports, vol. 19, no. 4, pp. 79-86, 2015, doi: 10.1515/ceer-2015-0054.
[19] ALTRAD-MOSTOSTAL, “Assembly Manual – MOSTOSTAL Plus Frame Scaffoldings”. [Online]. Available: http://www.altrad-mostostal.pl/wp-content/uploads/2020/02/instrukcje_rusztowania_ramowe_EN.pdf. [Accessed: 27. Apr. 2023].
[20] PN-EN 12810-2:2010 Rusztowania elewacyjne z elementów prefabrykowanych – Część 2: Specjalne metody projektowania konstrukcji. PKN, 2010.
[21] PN-EN 12811-1:2007 Tymczasowe konstrukcje stosowane na placu budowy – Cześć 1: Rusztowania – Warunki wykonania i ogólne zasady projektowania. PKN, 2007.
[22] PN-M-47900-2:1996 Rusztowania stojące metalowe robocze – Rusztowania stojakowe z rur. PKN, 1996.
[23] J. C. Rubio-Romero, M. Carmen Rubio Gámez, and J. A. Carrillo-Castrillo, “Analysis of the safety conditions of scaffolding on construction sites”, Safety Science, vol. 55, pp. 160-164, 2013, doi: 10.1016/j.ssci.2013.01.006.
[24] P. Jamińska-Gadomska, J. Bęc, T. Lipecki, and A. Robak, “Verification of the façade scaffolding computer model”, Archives of Civil Engineering, vol. 64, no. 1, pp. 41-53, 2018, doi: 10.2478/ace-2018-0003.
[25] P. Cyniak, E. Błazik-Borowa, J. Szer, T. Lipecki, and I. Szer, “The choice of boundary conditions and mesh for scaffolding FEM model on the basis of natural vibrations measurements”, AIP Conference Proceedings, vol. 1922, no. 1, art. no. 150002, 2018, doi: 10.1063/1.5019155.
Downloads
Published
How to Cite
Issue
Section
