Abstract: Recently the use of composite structures consisting of cold formed steel tubes infilled with concrete has become increasingly popular in civil engineering constructions. This is because of their excellent earthquake resistance properties namely high ductility, high stiffness and large energy absorption capacities. The subject of this work is to investigate the effect of high volume replacement level of cement with GGBS on the strength of concrete filled steel tubular short columns. A theoretical investigation of these experimental results with Euro code is also conducted. GGBS can be used as a replacement for cement or as an additional cementations material in concrete. By conducting cube strength test on 18 specimens with different percentage replacement level of cement, Optimum percentage of GGBS were found out. Infilling the hollow section columns with M30 grade concrete,concrete with GGBS as a replacement for cement were studied. Totally 8 columns were tested and load versus elongation, axial stess- strain behaviour for each type of column was studied. The results show that concrete filled steel tubular columns with optimum percentage of GGBS have the highest compressive strength at age of 28 days than steel tubular column with normal M30 concrete. In the case of ggbs concrete column, the maximum load that can be taken by that specimen is found to be 720 kn, which is 9.3% more compared with normal concrete specimen. The failure mode for column infilled with M30 grade concrete was outward folding failure at bottom of the column and separation of steel and concrete at ultimate load due to bond failure between steel tube and concrete