Abstract : For over many centuries, researchers have been working on a quite normal shape frame structures such as square and rectangular frame structures which is easily adaptable. High-rise building is being more common these days. So, in case of high-rise buildings, regular shape of such buildings like square and rectangular frame structures are not good enough in resisting the lateral loads such as wind and seismic loads. To resist more lateral force for superstructures a new geometry of frame configuration is adapted, which is known as trapezoidal frames. In this study, two-dimensional single-bay single-storey reinforced concrete trapezoidal infilled frame with cement mortar as interface and optimization of different percentage of openings in infill were analyzed under static loading. In particular, the paper discusses about the results such as displacement, lateral stiffness, bending moment, shear force and lateral load and stresses in infill wall.