## 4 Final Remarks and Conclusions  
The primary goal of this manuscript was the execution of a testing campaign to assess the efficiency of TRM strengthening solutions to improve the MIW out-of-plane behaviour, thus contributing to preventing their collapse in future earthquakes. An experimental campaign was carried out comprising by the realization of flexural strength tests parallel to the horizontal bed joints in eighteen MIW, 2 of them without plaster, 6 with plaster, 5 strengthened with low strength textile mesh and 5 with strong textile mesh. The effect of using plaster, TRM strengthening solution and the influence of using different types of mesh was assessed (such as weak or strong). From the testing campaign, the following conclusions can be drawn:  
* The plaster increased the flexural capacity of the MIW about 57%; however, it was not observed significant contribution in the deformation capacity;
* Therefore, the TRM strengthening technique revealed to be adequate to improve the flexural capacity of the panels, both in terms of strength and deformation;
* The selection of the mesh should be performed taking into account the type of masonry unit used to build the panel, since if weak brick units such as HCHB are used, it will not explore all of the  
Figure 7: Damages observed: (**a,b**) Specim 4 and (**c,d**) Specim 5.  
tensile strength characteristics of the mesh. The bricks will crush before the rupture of the mesh. It was observed that the rupture of the mesh occurred only when it was used the weak mesh (SWM specimens);  
The flexural strength increased 5% and 54% with a weak and strong mesh, respectively. On the other hand, the deformation capacity improved about 7.15 times and 4.18 times with a weak mesh and a strong mesh, respectively. From this study, it can be concluded that a cheaper strengthening solution like TRM can be easily applied in the buildings envelopes to prevent the MIW out-of-plane collapse when subjected to earthquakes. This strategy could have a meaningful impact on the reduction of fatalities and economic losses in future events. Finally, the dimensions of the specimen, which were designed according to the code standard demands, affected the conclusions of the testing campaign. It was observed shear failure in some of the models. The code demanding concerning the geometric dimensions should be revised to ensure the characterization of the flexure strength of non-strengthened and strengthened walls. As future work, it is suggested the repetition of this testing campaign using specimens with higher heigh/thickness (slenderness) ratio to clarify the findings herein obtained. Additionally, a future study is planned to be performed concerning the development of simplified analytical predictions of strengthened masonry infill walls with TRM. Conceptualization, A.F., H.R., A.A. and H.V. ; methodology, A.F. and A.A.; formal analysis, A.F. and H.R. ; investigation, A.F., H.R., A.A. and H.V. ; resources, H.V. and A.A.; writing--original draft preparation, A.F. and H.R. ; writing--review and editing, A.F., H.R., A.A. and H.V. ; supervision, H.R., A.A.; project administration, H.V. All authors have read and agreed to the published version of the manuscript. This work was financially supported by: Project POCI-01-0145-FEDER-007457-CONSTRUCT-Institute of R&D In Structures and Construction funded by FEDER funds through COMPETE2020-Programa Operacional Competitividade e Internacionalizacao and by national funds through FCT-Fundacao para a Ciencia e a Tecnologia. The authors would like also to acknowledge to the Laboratory of Earthquake and Structural Engineering (LESE) technicians, [PERSON] and [PERSON] for their support in the experimental activity reported in this research work.