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

机译：基于可靠性的临时脚手架结构设计的部分因子校准

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摘要

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.
机译：在这项工作中，基于可靠性计算校准了临时脚手架结构设计的部分因素。脚手架通常根据标准规则（例如，EN12811，EN12810）和在良好做法的代码中找到的信息。但是，没有明确证明这些设计程序导致支架结构的适当和一致的安全水平。本研究提出了适当的FAα粘结构的目标可靠性水平，基于确定部分因素。结果基于不同的脚手架设计情况的模拟，考虑到拉丁超立方体采样（LHS）产生的样本。通过施加形式分析来处理这些模拟的结果，用于屈曲和屈服支架元件。因此，确定对应于当前设计实践的固有可靠性。基于固有和目标可靠性，使用两种方法校准部分因素：基于最小平均平均的调整后的部分因子方法和优化过程。结论，2.5档范围内的年可靠性指数。3.5。这些导致部分因素低于或等于目前设计实践中使用的因素。因此，与当前的实践相比，临时结构的设计具有可能的优化，导致更经济的脚手架设计。

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