ANALYSIS OF REINFORCED CONCRETE COLUMNS FITTED INSIDE STEEL CASINGS

Due to construction costs and operational issues have been in this study discuss how strengthen the concrete columns. The results of previous studies on some structures earthquake-prone weakness reinforced inside steel casings surrounding columns is a modern technique used many countries today for rectangular circular concrete. advantages method convenient, economical easy. Reference model column without casing others were wrapped amount retrofitting, which has approved changing thickness cover are main variable research. Were analyzed under effect axial force using finite element by program ANSYS (version 11). showed that increase susceptibility bearing inflicted largest form casing, as well leads increased endurance.