Determination of the capacity curve and structural behavior of masonry structures is a chal-lenge. While consistent results can be obtained through detailed numerical approaches, the process becomes more complex. Therefore, simplified approaches come to the fore for anal-ysis. This study focuses on this point and proposes a new method that uses a truss model to determine the in-plane behavior of masonry structures. In the development of the pro-posed method, several important parameters such as the inclination angle, cross-sectional area, mesh size and material parameters are considered. This study specifically conducts a parametric analysis to determine the effect of different angle values on the results. The mate-rial model, which employs a macro modeling approach, was adopted from the literature and held constant during the numerical analysis; thus, its effects were excluded from the scope of this study. Variable conditions include mesh size, aspect ratio, compression stress level, and the inclination angle. A series of experimental tests on masonry walls was selected as the reference model, and a numerical model was created using the proposed approach. A total of seventy-two numerical analyses were performed. Consequently, the results were evaluated, and recommendations were made regarding the application of the new model