Mechanical Properties of Special-shaped Multi-cell CFST Columns With Different Construction Measures

In order to compare mechanical properties of special-shaped multi-cell concrete-filled steel tube( CFST) columns with different construction measures,five model specimens of octagonal specialshaped multi-cell CFST columns were analyzed by finite element analysis software Abaqus. On the basis of analysis,the seismic performance and stress variation of the five specimens were compared,and the analysis of their cost performance ratio and evaluation of the rationality of the different construction measures were also made. The analysis results show that the structural measures of setting cavity plates,vertical ribs and angle steels in steel pipes significantly affect seismic capacity of special-shaped multi-cell CFST columns,but that of setting horizontal ribs do not because the seismic performance of the giant columns can be improved by setting cavity plate,ribs,and so on,resulting in its reasonable cost performance ratio. It can be applied in actual engineering structures.