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Strengthening unreinforced masonry walls with welded steel mesh

By Ghalla M et al.·2026·Civil Engineering Department·View original on Europe PMC

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Original publication title: Shear performance of unreinforced masonry walls with door and window openings strengthened using welded steel mesh.

Plain-English summary

This study looked at how to make unreinforced masonry walls, which can be weak during earthquakes, stronger, especially when they have doors and windows that create weak spots. Researchers tested eleven different wall panels, some solid and some with openings, using a method that applies pressure diagonally. They found that adding welded steel mesh to the walls made them much better at handling stress and absorbing energy, with the best results coming from a specific mesh layout. Even though having openings reduced the walls' strength by nearly half, the mesh helped spread out the stress and delayed the formation of cracks. Overall, the study confirms that using welded steel mesh is a good way to strengthen these types of walls against earthquakes.

Abstract

Unreinforced masonry (URM) walls often exhibit poor seismic performance, particularly when openings interrupt the load path and create stress concentrations that significantly reduce in-plane shear capacity. This study investigates welded steel mesh (WSM) as a practical and economical strengthening solution for URM walls with openings. Eleven masonry panels-including solid walls and walls with central openings-were tested under diagonal compression (ASTM E519), examining various WSM configurations such as orthogonal, diagonal, partial, and full layouts. The strengthened walls showed marked improvements in ultimate load, stiffness, and energy absorption, with the full diagonal mesh providing the highest enhancement. Although openings reduced shear capacity by 49%, WSM reinforcement helped redistribute stresses and delay crack initiation. A validated finite element model supported a parametric study, which identified an optimal WSM ratio of 0.08% and showed that large openings significantly reduce strength. The results confirm WSM as an effective retrofit for improving URM seismic performance.

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Original publication on Europe PMC: https://europepmc.org/article/MED/41703246