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首页> 外文期刊>Bulletin of earthquake engineering >Seismic retrofit solutions using base isolation for existing RC buildings: economic feasibilty and pay-back time
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Seismic retrofit solutions using base isolation for existing RC buildings: economic feasibilty and pay-back time

机译：使用碱隔离的地震改造解决方案对现有的RC建筑物：经济繁殖和薪酬时间

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摘要

The existing reinforced concrete buildings typical of the Mediterranean area commonly have poor seismic performance and high vulnerability to the seismic events. As demonstrated by recent post-earthquake reconstruction processes, they commonly exhibited significant damage to structural components and to infills and partitions resulting in very high repair costs. This suggests that effective seismic strengthening interventions should aim at both improving the safety and reducing the expected annual losses. Nowadays, the seismic retrofitting of existing RC buildings by using base isolation is becoming popular because of the high effectiveness as seismic protection strategy. However, the high costs of installation are limiting the widespread in the common design practice. In this context, a unique design parameter capable of combining the increasing seismic safety, the cost of installation and the reduction of the expected losses can be useful to draw simple cost-benefits considerations. This research work proposes a PBEE-based methodology to quantify the Pay-Back Time (PBT) of seismic retrofit solutions for existing RC buildings. The non-linear response of base isolated building is assessed and a comparison with different strengthening solutions is proposed to show the applicability of the PBT as a unique design parameter to select the most effective retrofit solution. A database of 59 RC buildings retrofitted by using base isolation during the L'Aquila reconstruction process, where actual retrofit costs are available, is used for the validation. Finally, these data are used to calibrate a simple formulation of the PBT to be used in the design practice.
机译：地中海地区典型的现有钢筋混凝土建筑通常抗震性能较差，且易受地震影响。正如最近的地震后重建过程所表明的那样，它们通常会对结构部件、填充物和隔墙造成严重损坏，导致极高的修复成本。这表明，有效的抗震加固措施应以提高安全性和减少预期年损失为目标。目前，利用基础隔震技术对既有钢筋混凝土建筑进行抗震加固正成为一种流行的抗震措施，因为它具有高效的抗震性能。然而，高昂的安装成本限制了通用设计实践中的广泛应用。在这种情况下，一个独特的设计参数，能够结合不断提高的地震安全性、安装成本和预期损失的减少，有助于得出简单的成本效益考虑。本研究工作提出了一种基于PBEE的方法来量化现有钢筋混凝土建筑抗震加固解决方案的回报时间（PBT）。评估了基础隔震建筑的非线性响应，并与不同加固方案进行了比较，以表明PBT作为唯一设计参数的适用性，从而选择最有效的加固方案。在拉奎拉重建过程中，使用了59座钢筋混凝土建筑的数据库进行了验证，该数据库在实际改造成本可用的情况下使用了基础隔震进行了改造。最后，这些数据用于校准设计实践中使用的PBT的简单公式。

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