The current research focuses on a numerical and analytical study aimed at investigating the efficiency of a steel-based reinforcement system suitable for existing masonry walls. The application of such a retrofitting technique, which consists of glued thin steel grids applied on both faces of a masonry panel, is reversible, cheap and easy to be executed and appears to be suitable especially for buildings with concrete slab or inter-stories beams to which the steel elements could be anchored. The study is based on a reference experimental test carried out at the “Politehnica” University of Timisoara (Romania), within the European FP6 project PROHITECH. The reference test provided the application of a constant vertical compression and cyclic horizontal displacements to an unreinforced brick-cement mortar wall in full-scale (1500 × 1500 × 250 mm), to which was conferred a double-fixed constraint condition. Based on the experimental evidences, a reference numerical model has been implemented in ABAQUS, by adopting a plastic-damage material and a macro-element approach for the masonry modelling. Hence, in order to determine a design criterion of the studied system, a comparison with the analytical formulations available in the current Italian and European codes for the unreinforced configuration is presented in this study. Then, a wide parametric study on the investigated retrofitting technique has been carried out by varying thickness and spacing of steel grid elements, as well as the geometrical ratio of the panel (height/length). On the basis of the numerical results, a capacity formulation has been proposed, which takes into account the steel distribution in the masonry panel. The obtained outcomes revealed that the strength increase achievable by adopting the studied reinforcement system could be compared to the efficiency of a reinforced masonry wall of new construction and it is strongly influenced by the geometrical ratio of the wall, as well as the steel distribution.

当前的研究集中在数值和分析研究上，旨在研究适用于现有砌体墙的钢基增强系统的效率。这种改造技术的应用是可逆的，便宜的，易于执行的，该改造技术由粘贴在砖石面板两面上的胶粘薄钢格栅组成，似乎特别适用于带有混凝土板或层间梁的建筑物。可以锚固钢元素。这项研究基于在蒂米什瓦拉（罗马尼亚）的“ Politehnica”大学（欧洲FP6项目PROHITECH）中进行的参考实验测试。参考测试提供了恒定的垂直压缩和循环的水平位移在未加筋的水泥砂浆墙的全尺寸（1500×1500×250 mm）下的应用，赋予了双重固定约束条件。基于实验证据，通过采用塑性损伤材料和宏单元方法对砌体建模，在ABAQUS中实现了参考数值模型。因此，为了确定所研究系统的设计标准，本研究提出了与意大利和欧洲现行法规中未加强构型的分析公式的比较。然后，通过改变钢网格元素的厚度和间距以及面板的几何比例（高度/长度），对所研究的改造技术进行了广泛的参数研究。根据数值结果，提出了一种容量公式，其中考虑了砌体面板中的钢分布。