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Seismic response of the Circuit Wall of the Acropolis of Athens: Recordings versus numerical simulations

机译：雅典卫城电路墙的地震响应：记录与数值模拟

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摘要

The Acropolis of Athens is one of the most prestigious ancient citadels in the world, and therefore, the structural integrity of its monuments and structures is of paramount importance. Since Greece is characterized by high seismicity, a seismic array of accelerographs has been installed on the Acropolis hill over the last decade in order to monitor the dynamic response and distress of monuments and structures in real time. One of the monuments is the Circuit Wall, which is actually an old perimeter masonry retaining structure. Undoubtedly, monitoring its seismic response comprises a very interesting and useful "real-scale experiment". Furthermore, records and analyses in the literature have shown that the seismic behaviour of any retaining structure is a complicated problem of dynamic soil-structure interaction, where many parameters seem to have a substantial impact on the overall dynamic response and distress. Based on the aforementioned, the current study aims to shed light on the seismic response and distress of the Acropolis’ Circuit Wall. After a short description of the prevailing geological and geotechnical conditions of the Acropolis' hill and the available geometrical and mechanical properties of the Wall, an evaluation of the available seismic records is conducted. Subsequently, preliminary two-dimensional dynamic numerical simulations are being performed utilizing the finite-element method in order to estimate the seismic response of the Wall in terms of acceleration. Despite the various uncertainties of the numerical simulations (i.e. the input parameters), the results are in a good agreement with the available records.
机译：雅典卫城是世界上最负盛名的古代城堡之一，因此，其古迹和建筑物的结构完整性至关重要。由于希腊的地震活动性很高，因此在过去的十年中，在雅典卫城山上安装了一系列地震加速度计，以便实时监控纪念碑和建筑物的动态响应和遇险情况。纪念碑之一是巡回墙，实际上是一个古老的外围砌体保留结构。毫无疑问，监视其地震响应包括一个非常有趣且有用的“真实规模实验”。此外，文献中的记录和分析表明，任何挡土结构的地震行为都是动力土-结构相互作用的复杂问题，其中许多参数似乎对整体动力响应和遇险具有重大影响。基于上述内容，本研究旨在阐明雅典卫城围墙的地震响应和遇险情况。在简要描述了雅典卫城山的主要地质和岩土条件以及围墙的可用几何和机械特性之后，对可用的地震记录进行了评估。随后，利用有限元方法进行了初步的二维动态数值模拟，以便根据加速度估算墙的地震响应。尽管数值模拟存在各种不确定性（即输入参数），但结果与可用记录非常吻合。

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