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Structural damages of L'Aquila (Italy) earthquake

机译：拉奎拉（意大利）地震的结构破坏

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摘要

On 6 April 2009 an earthquake of magnitude 6.3 occurred in L'Aquila city, Italy. In the city center and surrounding villages many masonry and reinforced concrete (RC) buildings were heavily damaged or collapsed. After the earthquake, the inspection carried out in the region provided relevant results concerning the quality of the materials, method of construction and the performance of the structures. The region was initially inhabited in the 13th century and has many historic structures. The main structural materials are unreinforced masonry (URM) composed of rubble stone, brick, and hollow clay tile. Masonry units suffered the worst damage. Wood flooring systems and corrugated steel roofs are common in URM buildings. Moreover, unconfined gable walls, excessive wall thicknesses without connection with each other are among the most common deficiencies of poorly constructed masonry structures. These walls caused an increase in earthquake loads. The quality of the materials and the construction were not in accordance with the standards. On the other hand, several modern, non-ductile concrete frame buildings have collapsed. Poor concrete quality and poor reinforcement detailing caused damage in reinforced concrete structures. Furthermore, many structural deficiencies such as non-ductile detailing, strong beams-weak columns and were commonly observed. In this paper, reasons why the buildings were damaged in the 6 April 2009 earthquake in L'Aquila, Italy are given. Some suggestions are made to prevent such disasters in the future.
机译：2009年4月6日，意大利拉奎拉市发生6.3级地震。在市中心和周围的村庄，许多砖石和钢筋混凝土（RC）建筑物被严重破坏或倒塌。地震后，在该地区进行的检查提供了有关材料质量，构造方法和结构性能的相关结果。该地区最初居住于13世纪，拥有许多历史建筑。主要的结构材料是由瓦砾石，砖和空心粘土砖组成的非增强砌体（URM）。石工单位遭受的破坏最严重。木地板系统和波纹钢屋顶在URM建筑物中很常见。此外，山墙狭窄，壁厚过大，彼此之间没有连接是砌筑不良的最常见缺陷。这些墙导致地震荷载增加。材料和结构的质量不符合标准。另一方面，几座现代的非延性混凝土框架建筑物倒塌了。不良的混凝土质量和不良的钢筋细节导致钢筋混凝土结构的损坏。此外，通常观察到许多结构缺陷，例如非延性细部，强横梁弱柱。本文给出了在意大利拉奎拉（L'Aquila）2009年4月6日地震中建筑物受损的原因。提出了一些防止将来发生此类灾难的建议。

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