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Sensitivity analysis for setting up the investigation protocol and defining proper confidence factors for masonry buildings

机译：敏感性分析，用于建立调查协议并定义砌体建筑物的适当置信度

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摘要

At present, the codified procedures for the seismic assessment of existing structures do not consider explicitly the use of sensitivity analysis that, on the contrary, is an essential tool due to the intrinsic and epistemic uncertainties involved. In particular, results of a sensitivity analysis allow, on one hand, to optimize the plan of investigations and tests, limiting it to what is really useful, and, on the other hand, to be aware of the propagation of uncertainties in the final outcome of the assessment. The paper proposes how to implement the sensitivity analysis in a systemic way, in order to define proper confidence factors, which are used within the semi-probabilistic approach of the performance-based assessment procedure. In relation to the procedures adopted by current standards, this method is aimed to overcome the following drawbacks: (1) the a priori definition of values for the confidence factor; (2) the a priori selection of parameters to which confidence factor has to be applied; (3) the weak connection between investigation and assessment. Despite the generality of most aspects of the proposed procedure, main attention is given in the paper to its application in the case of masonry existing buildings and, in particular, of those with a significant cultural value, where the minimization of invasiveness of investigations on the construction together with that of costs plays a crucial role for the aim of conservation.
机译：目前，对现有结构进行地震评估的编纂程序并未明确考虑使用敏感性分析，相反，由于涉及内在和认识上的不确定性，敏感性分析是必不可少的工具。特别是，敏感性分析的结果一方面可以优化研究和测试的计划，将其限制在真正有用的范围内，另一方面，也可以知道最终结果中不确定性的传播评估。本文提出了如何以系统的方式实施敏感性分析的方法，以定义适当的置信度，这些置信度将在基于绩效的评估过程的半概率方法中使用。关于当前标准所采用的程序，该方法旨在克服以下缺陷：（1）先验定义置信度的值; （2）先验选择必须应用置信因子的参数; （3）调查与评估之间的联系薄弱。尽管拟议程序的大多数方面具有普遍性，但本文仍主要关注其在砌体结构的现有建筑物中的应用，尤其是在具有重大文化价值的建筑物中，在这种情况下，对建筑物的调查的侵入性降至最低建设与成本一起对于保护的目标起着至关重要的作用。

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