Reinforced concrete (RC) frames often incorporate unreinforced masonry infills which are composed of either solid or hollow clay bricks or concrete units and have been widely used for many decades around the world. Researchers have discovered that masonry infill enclosed in RC frames has a considerable stiffening and strengthening effect, which can be beneficial or adverse in the case of seismic action and influences global displacement capacity. Although numerous experimental and numerical studies have shown in different literature that masonry infills modify the behaviour of framed structures under lateral loads, the contribution of panels is generally neglected in the common structural analysis due to modeling complexity.