A considerable number of the existing reinforced concrete buildings in Turkey where destructive earthquakes are experienced frequently do not have required strengths and rigidities. Therefore, the earthquakes result in serious life and asset losses. Today, many strengthening methods are applied for the improvement of the behaviors of the reinforced concrete structures against earthquakes. However, the utilization of the building is prevented during the strengthening processes that cause additional heavy costs. Therefore, easier and more effective methods should be developed to provide the rapid strengthening of the house constructions and strengthen the public buildings like schools that are continuously under utilization and can not be emptied. In this study, the variations of “external shear wall addition” method that is applied to the exterior sides of the building and will respond to the aforementioned demand were investigated experimentally. For this purpose, four reinforced concrete frames were produced as single span, two floors in ½ geometric scales which contained the problems encountered in our country. One of these frames was bare frame, while the other one was strengthened with external shear wall addition without any coupling beams (the members are tied together without leaving any empty space between frame and shear wall) and the other two were strengthened with external shear wall addition and coupling beams (the coupling beams and the members are tied together by leaving empty space between frame and shear wall). A fifth experiment was carried out to investigate the individual behavior of the external shear wall added to the system for strengthening purpose. A triangular loading distribution system was performed by applying 2 units of loading to the upper floor and 1 unit of loading to the lower floor.