Infill walls are inevitable components of any structure to create dispassion between interior space and external
condition. In general, there are some prevalent openings inside the infill walls because of practical needs, architectural
observations or aesthetic inspections. In current design practice, strength and inflexibility contribution of infill walls aren't
thought of. However, the presence of infill walls may impact the seismic reaction of structures exposed to earthquake loads and
cause a conduct which is not the same as that estimated for a bare frame.