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Structure failures often happen whether caused by bad planning or implementation, especially at a reinforced concrete bar. Failures on building structure elements might be caused by several factors such as planned age of use, transformation on building function, and even improper construction procedure or method. Thus, the reinforced concrete bar strengthening is required especially on a 10 m bar. This study focus is comparison on strengthening the original structure of the building using the CFRP method which overlaying the bar surface, adding the IWF bar as a cantilever from below of the desired structure, and enlarging the bar dimensions. The result of the study shows that using 5 m2 CFRP overlayed on flexible reinforcement and 2.5 m2 CFRP overlayed in shear reinforcement results in Mn = 207.82 Knm and Vn = 146.33 Kn. Furthermore, additional 400,400,13,31 IWF bar for the strengthening result in Mn = 1045,32 Knm and Vn = 809,79 Kn. Finally, the dimension enlargement to 650 mm x 350 mm of 4D16 reinforced concrete and P10-250 mm reinforced cross-bar result in Mn = 529,23 Knm and Vn = 78,56 Kn. Effectiveness analysis is done to select the most effective method considering its strength gained and the cost required.