ABSTRACT

The improvement of the seismic performance of existing buildings is majorly accomplished by adopting one or more retrofitting interventions. The selection of the latter is generally made considering conventional parameters, based on e.g. economic or structural considerations, without carrying out a comprehensive and integrated comparison of different retrofitting solutions. Instead, for an optimal choice of a retrofitting option, it is necessary to include different evaluation criteria to better assess the effectiveness of each strategy. This aspect becomes even more relevant when referring to buildings of strategic importance, such as school buildings, for which typical structural response-oriented criteria may not be enough to identify the best choice. This paper implements and scrutinizes various multi-criteria evaluation methodologies to comparatively assess retrofitting options for an existing reinforced concrete (RC) school building, considering different aspects, weighted according to their deemed importance. These evaluation criteria focus not only on the structural performance but also on how each intervention affects the operability of the building and on economic aspects. A comparative performance assessment is conducted on a detailed numerical model, able to reproduce the main structural deficiencies observed during past earthquakes in RC school buildings. Then, different retrofitting interventions are identified with the aim to solve the structural issues and improve the overall performance of the case-study school building. The seismic performance is quantified in terms of seismic losses, including the contribution of non-structural elements, amongst several other metrics. Finally, the outcomes of the different evaluation methodologies, which denote a non-unanimous optimal solution, are compared and critically analyzed.

摘要

现有建筑物抗震性能的提高主要通过采用一种或多种改造干预措施来实现。后者的选择通常是基于例如经济或结构考虑考虑常规参数，而不是对不同的改造解决方案进行全面和综合的比较。相反，对于改造方案的最佳选择，有必要包括不同的评估标准，以更好地评估每个策略的有效性。当提到具有战略重要性的建筑物时，这一方面变得更加相关，例如学校建筑，典型的结构响应导向标准可能不足以确定最佳选择。本文实施并审查了各种多标准评估方法，以比较评估现有钢筋混凝土 (RC) 学校建筑的改造方案，考虑不同方面，根据其认为的重要性进行加权。这些评估标准不仅关注结构性能，还关注每项干预措施如何影响建筑物的可操作性和经济方面。对一个详细的数值模型进行了比较性能评估，该模型能够再现过去地震期间在 RC 学校建筑中观察到的主要结构缺陷。然后，确定不同的改造干预措施，以解决结构问题并提高案例研究学校建筑的整体性能。抗震性能是根据地震损失量化的，包括非结构元素的贡献，以及其他几个指标。最后，对表示非一致最优解的不同评估方法的结果进行了比较和批判性分析。