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This study was carried out aimed to investigate the effect of using concrete-filled steel tube (CFT) columns on steel moment frame with different numbers of stories by dynamic time history analysis. FEM method (formerly ABAQUS) was used for modeling. A model was first modeled in Abacus software according to the conditions and dimensions of the laboratory model and subjected to lateral cyclic loading. According to the results of comparison of hysteresis behavior, the specimen with CFT column has higher residual behavior and energy dissipation than the simple steel moment frame. Frame with CFT column has higher energy dissipation and lower resistance drop. 24 numerical models with 1, 2 and 3 stories were analyzed under different earthquakes. Time history charts of different models were compared. According to the results, the use of steel filled with concrete leads to increase the load-bearing of the frame in steel frame. Filling the steel column with concrete prevents the buckling of the concrete into the column and delays the local buckling of the steel wall. Concrete-filled steel frame steel has a better energy dissipation behavior than steel frame. Roof displacement of different frames with CFT column was lowers than that the roof displacement of steel frame, which indicates the frame performance has improved. The presence of concrete in the column has a significant effect on the behavior of the frame so that damage in the CFT column occurs at the panel zone where the column generally has a good behavior, but occurs in the steel column under buckling earthquake in the column.

The effect of using concrete-filled tube columns on steel moment frame with different numbers of stories by dynamic time history analysis