Buildings of strategic importance should be able to resist seismic forces in accordance with potential earthquakes that may occur at the location and remain fully operational afterwards. However, many of them were constructed before the modern principles of seismic design were known (especially regarding detailing and ductility), and therefore may be considered substandard. The first step in mitigating the seismic risk of such structures is to assess their seismic performance and, in particular, to identify their structural deficiencies. This study presents a comprehensive methodology for the seismic performance assessment of individual buildings, applied to an existing reinforced concrete (RC) hospital. This building is of an irregular layout, constructed as a structural wall system, and it is located in the seismically active region of Croatia. It includes the assessment of seismic hazards on the location, ambient noise measurements, experimental determination of structural modal parameters, creation of a detailed numerical model calibrated with experimental data, and a seismic performance assessment using various analysis methods. As a result, the building collapse mechanisms were determined and critical structural elements identified, which is the basis for future actions directed to the reduction of its risk (e.g., applications of specific measures for a target retrofit, proposal of evacuation routes and safe places inside the building, etc.).

中文翻译：

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现有不规则几何RC墙建筑的抗震性能评估：克罗地亚一家医院的案例研究

具有战略重要性的建筑物应能够抵抗该地点可能发生的潜在地震，并在此后保持完全运转。但是，它们中的许多是在了解现代抗震设计原理之前（尤其是在细节和延性方面）被建造的，因此可能被认为是不合格的。减轻此类结构的地震风险的第一步是评估其抗震性能，尤其是确定其结构缺陷。这项研究提出了一种适用于现有钢筋混凝土（RC）医院的用于评估单个建筑物的抗震性能的综合方法。这栋建筑是不规则布局，被构造为结构墙系统，位于克罗地亚的地震活跃地区。它包括评估位置上的地震危害，环境噪声测量，结构模态参数的实验确定，创建用实验数据校准的详细数值模型以及使用各种分析方法进行的地震性能评估。结果，确定了建筑物倒塌的机制并确定了关键的结构要素，这是未来为降低其风险采取行动的基础（例如，针对目标改造应用特定措施，建议疏散路线和内部安全场所）建筑物等）。并使用各种分析方法进行地震性能评估。结果，确定了建筑物倒塌的机制并确定了关键的结构要素，这是未来为降低其风险采取行动的基础（例如，针对目标改造应用特定措施，建议疏散路线和内部安全场所）建筑物等）。并使用各种分析方法进行地震性能评估。结果，确定了建筑物倒塌的机制并确定了关键的结构要素，这是未来为降低其风险采取行动的基础（例如，针对目标改造应用特定措施，建议疏散路线和内部安全场所）建筑物等）。