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Reliability-based calibration of partial factors for the design of temporary scaffold structures

Eline Vereecken (UGent) , Wouter Botte (UGent) , Didier Droogné (UGent) and Robby Caspeele (UGent)
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Abstract
In this work, partial factors for the design of temporary scaffold structures are calibrated based on reliability calculations. Scaffolds are commonly designed in accordance with the rules in standards (e.g. EN12811, EN12810) and information found in codes of good practice. However, there is no clear proof that these design procedures result in an appropriate and consistent safety level for scaffold structures. The present study proposes appropriate target reliability levels for fa?ade scaffolds, based on which partial factors are determined. The results are based on simulations of different scaffold design situations, considering samples generated by Latin Hypercube Sampling (LHS). The results of these simulations are processed by applying FORM analyses for buckling and yielding of the scaffold elements. As such, the inherent reliability corresponding to current design practice is determined. Based on the inherent and target reliabilities, partial factors are calibrated using two methods: the Adjusted Partial Factor Method and an optimisation procedure based on least-square averaging. Concluding, annual reliability indexes in the range 2.5?3.5 are found. These lead to partial factors lower than or equal to those used in current design practice. Hence, there is an optimisation possible in the design of temporary structures compared to current practice, leading to more economical scaffold designs.
Keywords
OPTIMIZATION, Safety factors, calibration, temporary structures, reliability & risk, analysis, structural reliability, optimisation

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MLA
Vereecken, Eline, et al. “Reliability-Based Calibration of Partial Factors for the Design of Temporary Scaffold Structures.” STRUCTURE AND INFRASTRUCTURE ENGINEERING, vol. 16, no. 4, 2020, pp. 642–58, doi:10.1080/15732479.2019.1670214.
APA
Vereecken, E., Botte, W., Droogné, D., & Caspeele, R. (2020). Reliability-based calibration of partial factors for the design of temporary scaffold structures. STRUCTURE AND INFRASTRUCTURE ENGINEERING, 16(4), 642–658. https://doi.org/10.1080/15732479.2019.1670214
Chicago author-date
Vereecken, Eline, Wouter Botte, Didier Droogné, and Robby Caspeele. 2020. “Reliability-Based Calibration of Partial Factors for the Design of Temporary Scaffold Structures.” STRUCTURE AND INFRASTRUCTURE ENGINEERING 16 (4): 642–58. https://doi.org/10.1080/15732479.2019.1670214.
Chicago author-date (all authors)
Vereecken, Eline, Wouter Botte, Didier Droogné, and Robby Caspeele. 2020. “Reliability-Based Calibration of Partial Factors for the Design of Temporary Scaffold Structures.” STRUCTURE AND INFRASTRUCTURE ENGINEERING 16 (4): 642–658. doi:10.1080/15732479.2019.1670214.
Vancouver
1.
Vereecken E, Botte W, Droogné D, Caspeele R. Reliability-based calibration of partial factors for the design of temporary scaffold structures. STRUCTURE AND INFRASTRUCTURE ENGINEERING. 2020;16(4):642–58.
IEEE
[1]
E. Vereecken, W. Botte, D. Droogné, and R. Caspeele, “Reliability-based calibration of partial factors for the design of temporary scaffold structures,” STRUCTURE AND INFRASTRUCTURE ENGINEERING, vol. 16, no. 4, pp. 642–658, 2020.
@article{8661755,
  abstract     = {In this work, partial factors for the design of temporary scaffold structures are calibrated based on reliability calculations. Scaffolds are commonly designed in accordance with the rules in standards (e.g. EN12811, EN12810) and information found in codes of good practice. However, there is no clear proof that these design procedures result in an appropriate and consistent safety level for scaffold structures. The present study proposes appropriate target reliability levels for fa?ade scaffolds, based on which partial factors are determined. The results are based on simulations of different scaffold design situations, considering samples generated by Latin Hypercube Sampling (LHS). The results of these simulations are processed by applying FORM analyses for buckling and yielding of the scaffold elements. As such, the inherent reliability corresponding to current design practice is determined. Based on the inherent and target reliabilities, partial factors are calibrated using two methods: the Adjusted Partial Factor Method and an optimisation procedure based on least-square averaging. Concluding, annual reliability indexes in the range 2.5?3.5 are found. These lead to partial factors lower than or equal to those used in current design practice. Hence, there is an optimisation possible in the design of temporary structures compared to current practice, leading to more economical scaffold designs.},
  author       = {Vereecken, Eline and Botte, Wouter and Droogné, Didier and Caspeele, Robby},
  issn         = {1573-2479},
  journal      = {STRUCTURE AND INFRASTRUCTURE ENGINEERING},
  keywords     = {OPTIMIZATION,Safety factors,calibration,temporary structures,reliability & risk,analysis,structural reliability,optimisation},
  language     = {eng},
  number       = {4},
  pages        = {642--658},
  title        = {Reliability-based calibration of partial factors for the design of temporary scaffold structures},
  url          = {http://dx.doi.org/10.1080/15732479.2019.1670214},
  volume       = {16},
  year         = {2020},
}

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