Numerical Study of the Column Reinforced with Shape Memory Alloy

Abstract

Columns are the primary load carrying members in buildings and bridges. Hence for better seismic performances the permanent drift after severe earthquake has to be reduced to make the structure functional with less maintenance. The use of the shape memory alloys in critical region can reduce the residual displacement due to its super-elastic nature. Super-elastic shape memory alloy bars have higher linear elastic range of 4–12% and can return back to its initial shape upon removal of load. In this numerical study full scale circular column with various types of nickel, iron and copper based shape memory alloy (SMA) bars in the critical region under reverse cyclic loading with constant axial load of 10%. The seismic performance of the SMA-steel reinforced column was compared with the steel reinforced normal column. The column reinforced with FeMnAlNi SMA in critical region shows better seismic performance considering load carrying capacity, displacement ductility, maximum displacement, lesser permanent deformation and energy dissipation capacity.