## 4 Conclusions  
This paper presented a numerical parametric study on the key factors influencing the shear strength of precast concrete walls connected by dry connections, specifically using steel bars. The analysis revealed several patterns and correlations among the parameters studied. It was observed that the impact of specific parameters, such as wall section height or concrete compressive strength (fck), varied depending on the normalised axial load. In general, the results showed a positive correlation between increased section height, concrete strength, and axial load with shear capacity, while an increase in overall wall height tended to decrease shear capacity. Incremental adjustments to rebar size, quantity, and placement had a positive impact on shear capacity. Key quantitative findings include:  
Figure 11: Influence of the number and position of the bars (**a**) Global Trends for all Section Heights, (**b**) Magnified view for hc = 1.5 m (**c**) Magnified view for hc = 2.25 m, (**d**) Magnified view for hc = 2.5 m.  
* Wall Geometry--Section Height: An increase in section height significantly enhances the shear capacity. For example, in the most favourable case studied (fck = 50 MPa, v = 0.8, H = 2.67 m), increasing the section height from hc = 2 m to hc = 3 m resulted in a shear strength increase from 2361 kN to 4349 kN, representing an 84% improvement. * Wall Geometry--Wall Height: Conversely, increasing the overall wall height reduced shear capacity. For instance, with fixed parameters (Section 3.4), increasing wall height from H = 1.5 m to H = 3.5 m reduced shear strength from 1878 kN to 760 kN, a 58% decrease. * Axial Load: Increased axial load significantly improved shear capacity by enhancing friction and force distribution within the wall. The most notable increase observed was over 1300%, rising from 298 kN (v = 0.0) to 4349 kN (v = 0.8) for fixed parameters (fck = 50 MPa, hc = 3 m, H = 2.67 m). * Concrete Compressive Strength: Higher compressive strength of concrete greatly improved shear capacity, with an increase of 125% observed--from 1930 kN (fck = 20 MPa) to 4349 kN (fck = 50 MPa), under fixed parameters (v = 0.8, H = 2.67 m, hc = 3 m). * Mechanical Connections--Diameter: Increasing rebar diameter from 2\(\phi\)20 to 2\(\phi\)30 improved shear capacity from 915 kN to 1095 kN, a 22% increase (hc = 2.25 m, H = 2.67 m, v = 0.2, fck = 30 MPa). * Mechanical Connections--Quantity: Increasing the number of bars from 2\(\phi\)25 to 5\(\phi\)25 increased shear capacity from 827 kN to 1029 kN, a 24% improvement (hc = 2.25 m, H = 2.67 m, v = 0.2, fck = 30 MPa). * Mechanical Connections--Placement: Adjusting bar placement from cantered to edge placement resulted in a minor increase from 1029 kN to 1059 kN, a 3% improvement (hc = 2.25 m, H = 2.67 m, v = 0.2, fck = 30 MPa). While these findings provide valuable insights, the study has several limitations. The analysis focused exclusively on shear strength, neglecting other critical factors such as hysteretic behaviour and failure modes, which are vital for assessing the overall structural performance of the walls. Moreover, the parameters analysed were limited to a specific range, which may not fully capture the diversity of practical applications. Future research should address these limitations by expanding the scope of parameters studied, including hysteretic curves and failure patterns, to validate and refine the results. Additionally, developing detailed design guidelines that integrate all critical factors will be essential for practical implementation. Experimental validation of the theoretical models and the establishment of standardised practices will also be crucial to ensure the reliability, safety, and efficiency of precast concrete walls with dry connections. Conceptualisation, A.F. and P.D. ; methodology, A.R. and P.D. ; software, P.D. ; validation, P.D. ; investigation, A.R. and P.D. ; writing--original draft preparation, A.R., P.D. and S.H. ; writing--review and editing, A.F. ; visualisation, A.R. ; supervision, A.F.