In this paper, the structural behavior of masonry panels strengthened with a system made up of composite fiber grids embedded in a cementitious matrix (FRCM) is presented. The non-linear behavior of the unreinforced and reinforced panels is numerically simulated by means of a simplified micro-modelling approach. This approach concentrates all the non-linearities and failures in the joints and in potential crack surfaces within the bricks, placed vertically in the middle of each brick. The FRCM strengthening system is discretized by a continuous bi-directional fiber grid constituted by trusses embedded into a cementitious matrix. A calibrated bond-slip relationship is applied between the fibers and the mortar matrix assuming an idealized bilinear law. The typical experimental load–displacement curve for a FRCM strengthened panel shows three principal phases that correspond to different failure mechanisms: masonry cracking, mortar matrix cracking and ultimate failure of the panel. The non-linear numerical analyses show a good agreement with experimental results and the modeling approach is found to be adequate to reproduce the described experimental behavior. The results of a parametric study on both the material and the geometrical properties of the FRCM system are also presented.

在本文中，介绍了由嵌入水泥基体 (FRCM) 中的复合纤维网格组成的系统加固的砌体板的结构行为。未增强和增强面板的非线性行为通过简化的微观建模方法进行数值模拟。这种方法将所有非线性和故障集中在接缝和砖内潜在的裂缝表面，垂直放置在每块砖的中间。FRCM 加固系统由嵌入水泥基体的桁架构成的连续双向纤维网格离散化。假设理想的双线性定律，则在纤维和砂浆基质之间应用校准的粘结-滑移关系。FRCM 加固板的典型实验载荷-位移曲线显示三个主要阶段，对应于不同的破坏机制：砌体开裂、砂浆基体开裂和板的最终破坏。非线性数值分析表明与实验结果非常吻合，并且发现建模方法足以重现所描述的实验行为。还介绍了对 FRCM 系统的材料和几何特性的参数研究结果。