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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Seismic fragility assessment of masonry building aggregates: A case study in the old city Centre of Seixal, Portugal
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Seismic fragility assessment of masonry building aggregates: A case study in the old city Centre of Seixal, Portugal

机译：砌体建设骨料的地震脆弱性评估 - 以葡萄牙的旧城市中心为例

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摘要

Aggregates made of old masonry structures represent a very common structural typology in many cities of the world. The structural units along the aggregates are characterized frequently by structural and geometrical heterogeneities. But urban growth led to the formation of many historic centres with similar structural typologies. The present study aims to assess the seismic fragility of masonry building aggregates using the old city centre of Seixal as a case study. The analysis involved the assessment of the most prevalent structural typology in the study area, considering the variability of a set of structural and geometrical parameters. The variation of such parameters has allowed the definition of 36 different structural configurations, whose seismic performance behaviours were studied employing non-linear static analyses. Based on the analyses, the peak ground accelerations (PGA(C)) corresponding to the attainment of the life safety limit state were obtained and the fragility curves were plotted. Furthermore, the behaviour of the structural configurations, analysed as isolated structural units, is also compared with their aggregate structural performance. Significant differences in the vulnerability of the buildings when isolated or in the aggregate are obtained, demonstrating that the seismic interactions between adjacent buildings should not be neglected. It was further possible to observe that the variation of the considered parameters significantly affects the seismic response of the building, particularly when the characteristics of the internal slabs are changed.
机译：由旧砌体结构制成的聚集体代表了世界上许多城市的一个非常常见的结构类型。沿着聚集体的结构单元经常通过结构和几何异质性表征。但城市增长导致了许多具有类似结构类型的历史中心的形成。本研究旨在评估使用Seixal的旧城中心的砌体建筑骨料的地震脆性作为案例研究。考虑到一组结构和几何参数的可变性，分析涉及评估研究区域中最普遍的结构类型学。这种参数的变化允许定义36种不同的结构配置，其采用非线性静态分析研究其地震性能行为。基于分析，获得对应于达到寿命安全极限状态的峰接地加速度（PGA（C））并绘制脆性曲线。此外，作为隔离结构单元分析的结构配置的行为也与它们的聚集结构性能进行了比较。获得孤立或聚集在骨料时脆弱性脆弱性的显着差异，证明了相邻建筑物之间的地震相互作用不应被忽略。还可以观察到所考虑的参数的变化显着影响建筑物的地震响应，特别是当内部板的特性改变时。

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