Introducing RC infills to selected bays in both directions is an effective approach for strengthening existing buildings having various deficiencies. However, if adopted for buildings in use, the building would need to be evacuated before starting the construction, which will last for several months. This would impair the practicality of the method. Hence, strengthening techniques applicable without interrupting the functioning of the building are urgently needed. In this study, it was intended to use existing partitions and non-load bearing exterior masonry infills as structural walls by strengthening them with CFRP strips. This paper reports test results related to frames having hollow clay tile infills strengthened by using CFRP conducted at METU.