It is an assembled CFT column structure that reduces the column size and improves the workability by filling the concrete directly on top of square and round steel pipe. It is the most suitable alternative for pilotty buildings that are vulnerable to earthquakes.
< Comparison of column stiffness of CFT structure and basic structure >
| Structure | CFT | |
|---|---|---|
| Surface |
|
|
| Axial stiffness |
Tensile | 1.0 |
| Com-pression | 1.0 | |
| Lateral stiffness |
1.0 | |
| Structure | CFT | |
|---|---|---|
| Surface |
|
|
| Axial stiffness |
Tensile | 1.0 |
| Com-pression | 1.0 | |
| Lateral | 0.9 | |
| Structure | S | |
|---|---|---|
| Surface |
|
|
| Axial stiffness |
Tensile | 1.5 |
| Com-pression | 0.5 | |
| Lateral | 0.7 | |
| Structure | RC | |
|---|---|---|
| Surface |
|
|
| Axial stiffness |
Tensile | 0.2 |
| Com-pression | 0.7 | |
| Lateral | 0.4 | |
