In-plane shear behaviour by diagonal-compression testing of damaged masonry walls strengthened with carbon-glass hybrid textile reinforced concrete

Abstract

In the realm of masonry structures, walls—serving as the primary load-bearing components—exhibit significant susceptibility to damage during seismic events owing to their inherent brittleness. To enhance the shear performance of damaged walls, diagonal compression tests were performed on damaged specimens reinforced with textile reinforced concrete (TRC). This study meticulously examines various factors, including the extent of damage, reinforcement strategies, the number of textile layers, and the anchoring of the surface layer, while exploring the mechanisms through which TRC enhances the shear performance of damaged walls. The findings indicate that post-repair specimens predominantly exhibited diagonal tensile failures. Repairs utilizing a single-sided, two-layer textile demonstrated a degree of out-of-plane bending, whereas dual-sided reinforcement produced the most pronounced improvements in performance. Moreover, the shear strength, ductility, and energy dissipation exhibited significant enhancements within a specific range as the number of textile layers increased. Notably, improvements in mechanical performance parameters were modest in severely damaged specimens, whereas they remained comparable between slightly damaged and intact specimens. Anchoring effectively alleviated the out-of-plane bending associated with single-sided repairs, thereby enhancing shear performance. Ultimately, a comparative analysis of the experimental results against analytical models for reinforced walls demonstrated that the ACI 549.6R-20 calculation method aligns closely with the experimental data.