Infill walls are typically treated as non-structural elements in building design and assessment, and they are ignored in analysis methods because they are assumed to be non-beneficial to response of a structure. Reinforced concrete framed buildings with infill walls are typically analysed as bare frames, with strength and stiffness contributions of the infills ignored. In this study an attempt is be made to find the effect of overhead water tank load on RC building with unreinforced infill wall.