Abstract
This study aims to clarify the fundamental data for the seismic design of strengthening of exiting buildings. In this paper, three kinds of jacketing are applied for strengthening of reinforced-concrete and steel-reinforced-concrete columns. Shear reinforcements, steel plates and carbon fiber reinforcements are used as jackets. The ultimate strength and ductility factor of strengthened columns are evaluated by design formulas for the seismic strengthening of exiting buildings. Strengthening effects of steel plates and carbon fiber reinforcements are evaluated through the replaced shear reinforcements ratios. Then, it is shown that such calculated values are conservatively evaluated as compared with experimental results. Also, strengthened columns with the sufficient amount of jacketing, flexurally fail at ends of members, and the adequate ultimate strength and ductile performance are obtained, regardless of above mentioned jacketing methods.
