This study developed a modified strut-and-tie method (STM) for the design of multi-pile caps in bridge structures. The pile caps are divided into three sections to conduct a detailed stress analysis. The study identifies key transverse stress mechanisms at specific points along the structure (L/3, L/4, and L/2) and accurate predictions of the maximum supported load. A comprehensive comparison between the modified STM calculations and 3D Finite Element Method (FEM) results was conducted to validate the proposed approach. The results from all sections were satisfactory, with the highest stresses observed at the midpoint of the multiply pile caps. This study applicability of the proposed method, demonstrating its effectiveness in stress analysis across various multi-pile cap designs. Furthermore, the proposed model shows the possibility of stress analysis in many types of multiple pile caps.