ABSTRACT

The Metropolitan Area of Lisbon (MAL) has the highest population and building density in Portugal, and is exposed to medium to high magnitude earthquakes due to its geographical location. Currently, the MAL housing stock is constituted by approximately 35% of masonry residential buildings with a large variability of materials and construction techniques, as a result of many centuries of history. Most of these buildings were built before the introduction of the first design code for building safety against earthquakes (RSSCS) in 1958 RSCCS. 1958. National standard: Code for building safety against earthquakes (Original title: Regulamento de Segurança das Construções contra os Sismos – RSCCS). [Google Scholar] and therefore were only designed to support gravity loads. Given the presence of these buildings in areas of significant seismicity, a comprehensive research is needed to assess the seismic risk and define mitigation policies for this population of unreinforced masonry buildings. The main purpose of this work is thus to geometrically characterize these typologies, through an exhaustive survey of dozens of masonry buildings collected from original drawings and identify the most important aspects that can influence their seismic behavior. After a compressive historical background, the information collected is statistically analyzed and expressed through probability distributions that can be used for the development of numerical models and derive seismic vulnerability functions, fundamental to conduct seismic risk analyses.

摘要

里斯本都会区 (MAL) 是葡萄牙人口和建筑密度最高的地区，由于其地理位置，容易遭受中高强度地震。目前，由于许多世纪的历史，MAL 住房存量由大约 35% 的砖石住宅建筑构成，其材料和施工技术存在很大差异。这些建筑物中的大多数是在1958 年引入第一个建筑抗震安全设计规范 (RSSCS) 之前建造的RSCCS。1958 年。国家标准：建筑抗震安全规范（原标题：Regulamento de Segurança das Construções contra os Sismos – RSCCS）。 [谷歌学术]因此仅设计用于支撑重力载荷。鉴于这些建筑物存在于地震活动严重的地区，需要进行全面的研究来评估地震风险并为这些未加固的砖石建筑群体制定缓解政策。因此，这项工作的主要目的是通过对从原始图纸中收集的数十座砖石建筑进行详尽调查，从几何上表征这些类型，并确定可能影响其地震行为的最重要方面。在压缩历史背景之后，收集到的信息通过概率分布进行统计分析和表达，这些概率分布可用于开发数值模型并导出地震易损性函数，这是进行地震风险分析的基础。