ABSTRACT

In this paper, a modified empirical large-territorial-scale procedure to assess the seismic vulnerability of aggregate buildings in urban areas located within a highly seismic context is proposed. The methodology is applied to a group of unreinforced masonry (URM) aggregates located in the Yungay’s historic center in downtown Santiago, Chile. This assessment was carried out by modifying and integrating a vulnerability-index-based procedure, a specific existing approach called first level macro-seismic method used to predict seismic damage and loss scenarios through fragility curves of structural components. The procedure was calibrated using the observed damage after the 2010 Chile earthquake in 292 URM structural units. The results of this new damage index for URM aggregate buildings are used to derive Probability Mass Functions (PMFs) of the different damage states and preliminary Empirical Fragility Functions (EFFs). To the best of the authors’ knowledge, these EFFs are the first publicly available for aggregate Chilean URM buildings. This research and its results are the starting point for a more comprehensive study for assessing damage scenarios and vulnerabilities of aggregate URM buildings in historic centers of older Chilean cities. These functions may be used in risk assessment, and are useful to prioritize possible future damage mitigation strategies and other processes involving this historical heritage. We foresee that these results could be at least partially applied to other historical urban areas in Chile, and perhaps other old Latin American cities located along the subduction convergence region between the Pacific and Continental plates, which were founded similarly.

摘要

在本文中，提出了一种改进的经验性大领土尺度程序，用于评估位于高地震背景下的城市地区聚合建筑物的地震脆弱性。该方法适用于位于智利圣地亚哥市中心 Yungay 历史中心的一组无筋砌体 (URM) 骨料。该评估是通过修改和整合基于脆弱性指数的程序进行的，这是一种称为一级宏观地震方法的特定现有方法，用于通过结构部件的脆弱性曲线预测地震破坏和损失情景。该程序使用 2010 年智利地震后 292 个 URM 结构单元中观察到的损坏进行校准。URM 骨料建筑物的这一新损坏指数的结果用于推导不同损坏状态的概率质量函数 (PMF) 和初步的经验脆弱性函数 (EFF)。据作者所知，这些 EFF 是第一个公开的智利 URM 聚合建筑。这项研究及其结果是更全面的研究的起点，用于评估智利老城市历史中心的聚合 URM 建筑的损坏情景和脆弱性。这些功能可用于风险评估，并有助于确定未来可能的损害缓解策略和涉及该历史遗产的其他过程的优先级。我们预见到这些结果至少可以部分应用于智利的其他历史城区，