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Performance-based assessment of the Great Mosque of Algiers

机译：基于绩效的阿尔及尔大清真寺评估

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The seismic Performance-Based Assessment (PBA) of monumental buildings requires to consider safety and conservation objectives, including also the possible presence of artistic assets. In order to face these issues, the case study of the Great Mosque of Algiers is analysed in this paper: in fact, besides to be one of the remaining Almoradiv architecture and the oldest mosque of the city, it is also characterized by the presence of a mihrab, a decorated arched niche that represents an interesting artistic asset to be included in the PBA. Within this context, particular attention has been paid to the choice of the most reliable modelling strategy for the application of the displacement approach in the PBA procedure, as a function of different possible seismic behaviours. In the case of Great Mosque both the current state of the building and a virtual strengthened condition are analysed. It is worth noting that, while in the current state the seismic behaviour of the asset is well described by a set of macroelements that may be analysed independently (through 2D models), in the second case the strengthening intervention leads to the adoption of a 3D global model (indeed, the roof bracing promotes a "box-type" behaviour). In the paper, the integrate use of three different modelling strategies of different complexity is discussed: the finite element model, the equivalent frame approach and the macro-block model. The results of nonlinear analyses performed (static and kinematic) constitute the main tool to interpret the seismic response of the asset, perform the PBA and address the choice on the rehabilitation decisions. These latter in this case are mainly affected by the occurrence of too high deformations in local portions of the building, including that in which the artistic asset is located.
机译：纪念建筑的抗震性能评估（PBA）需要考虑安全和保护目标，包括可能存在的艺术资产。为了解决这些问题，本文分析了阿尔及尔大清真寺的案例研究：实际上，除了成为阿尔莫拉季夫（Almoradiv）保留的建筑之一和该市最古老的清真寺外，它的特征还在于米哈拉布（mihrab），一种装饰的拱形壁iche，代表一种有趣的艺术资产，将包含在PBA中。在这种情况下，已将注意力转移到选择最可靠的建模策略上，以将位移方法应用到PBA程序中，这取决于可能的地震行为。以大清真寺为例，既分析了建筑物的当前状态，又分析了虚拟的加固情况。值得注意的是，虽然在当前状态下，资产的地震行为由一组可以单独分析（通过2D模型）进行分析的宏观元素很好地描述了，但在第二种情况下，加强干预导致采用了3D全局模型（实际上，屋顶支撑促进了“箱式”行为）。在本文中，讨论了三种不同复杂度的不同建模策略的集成使用：有限元模型，等效框架方法和宏块模型。进行的非线性分析（静态和运动学）结果构成了解释资产地震响应，执行PBA以及解决修复决策选择的主要工具。在这种情况下，后者主要受到建筑物局部区域（包括艺术资产所在的区域）中过高变形的影响。

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