Nonlinear Modelling of Curved Masonry Structures after Seismic Retrofit through FRP Reinforcing
Nonlinear Modelling of Curved Masonry Structures after Seismic Retrofit through FRP Reinforcing
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FRP 加固抗震改造后弯曲砌体结构的非线性建模
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
P. Lourenço
中科院分区：
文献类型：
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作者：
B. Pantò;F. Cannizzaro;S. Caddemi;I. Caliò;C. Chácara;P. Lourenço
对历史砖石结构在抗震改造前后的非线性行为进行可靠的数值评估是结构改造设计中的一个基本问题。已经引入了许多加固技术，旨在提高现有结构的结构性能，如果设计和应用得当，可以为保护其文化价值做出有效的贡献。在这些策略中，在砖石表面使用织物增强聚合物（FRP）材料正在被广泛应用于实际工程目的。条带或二维网格复合层的应用是一种低侵入性且易于应用的改造策略，由于其灵活性，能够在存在复杂几何形状的情况下改善砌体元素的面内和面外行为。因此，这些技术经常用于加固砌体弯曲构件，例如拱门和拱顶。在本文中，利用作者先前介绍的基于离散元方法的现有通用框架，为模拟砌体和 FRP 加固之间的相互作用而设想的离散元被应用于不同的弯曲砌体拱顶类型。该模型已用于评估砌体拱的非线性行为，这里首次用于评估 FRP 加固对双曲率单元的有效性。在对所提出的策略进行理论描述之后，提出了与承受地震荷载、具有不同加固条件的拱形和穹顶相关的两种应用。还将应用 FRP 条带来的好处与传统改造技术相关的好处进行了比较。针对结构比例因子进行敏感性研究。
A reliable numerical evaluation of the nonlinear behaviour of historical masonry structures, before and after a seismic retrofitting, is a fundamental issue in the design of the structural retrofitting. Many strengthening techniques have been introduced aimed at improving the structural performance of existing structures that, if properly designed and applied, provide an effective contribution to the preservation of their cultural value. Among these strategies, the use of fabric-reinforced polymeric (FRP) materials on masonry surface is being widely adopted for practical engineering purposes. The application of strips or 2D grid composite layers is a low invasive and easy to apply retrofitting strategy, that is able to improve both the in-plane and the out of plane behaviour of masonry elements also in the presence of complex geometries thanks to their flexibility. For this reason, these techniques are frequently employed for reinforcing masonry curved elements, such as arches and vaults. In this paper, taking advantage of an existing general framework based on a discrete element approach previously introduced by the authors, a discrete element conceived for modelling the interaction between masonry and FRP reinforcement is applied to different curved masonry vaults typologies. This model, already used for evaluating the nonlinear behaviour of masonry arches, is here employed for the first time to evaluate the effectiveness of FRP reinforcements on double curvature elements. After a theoretical description of the proposed strategy, two applications relative to an arch and a dome, subjected to seismic loads, with different reinforced conditions, are presented. The benefit provided by the application of FRP strips is also compared with that associated to traditional retrofitting techniques. A sensitivity study is performed with respect to the structure scale factor.