Thin layers of mortar reinforced with steel fibers can be applied on one or both sides of bearing walls as an effective seismic strengthening of existing masonry buildings. To assess the effectiveness of this technique, an experimental study on masonry sub-assemblages was carried out at the University of Brescia. This paper summarizes and discusses the main results of the investigation, which included mechanical characterization tests on masonry and its components as well as on the Steel Fiber Reinforced Mortar (SFRM) used to retrofit the masonry samples. Uniaxial and diagonal compression tests were carried out on both unstrengthened wallets and masonry samples retrofitted with 25 mm thick SFRM coating. Both single-sided and double-sided retrofitting configurations for application on wall surfaces were considered. The results highlighted the ability of the technique to improve the compressive and the shear behavior of masonry, even in case of single-sided strengthening. Moreover, no premature debonding of coating was observed. Lastly, the manuscript presents the results of a numerical investigation that was performed both to simulate the diagonal compression tests described in the first part of the paper and to predict the response of panels with different strengthening configurations.

中文翻译：

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通过钢纤维增强砂浆涂层改造未增强砌体：单轴和对角线压缩试验

可以在承重墙的一侧或两侧使用钢纤维加固的薄层砂浆，作为现有砖石建筑的有效抗震加固。为了评估这种技术的有效性，布雷西亚大学对砌体子组合进行了一项实验研究。本文总结并讨论了调查的主要结果，其中包括对砌体及其组件以及用于改造砌体样品的钢纤维增强砂浆 (SFRM) 的力学特性测试。对未强化的钱包和用 25 毫米厚 SFRM 涂层改装的砖石样品进行了单轴和对角线压缩测试。考虑了用于墙面的单面和双面改造配置。结果突出了该技术改善砌体抗压和抗剪性能的能力，即使在单面加固的情况下也是如此。此外，没有观察到涂层过早剥离。最后，手稿介绍了一项数值研究的结果，该研究旨在模拟本文第一部分中描述的对角线压缩测试，并预测具有不同加固配置的面板的响应。