Research Article
Test on Hysteretic Behaviour of Prestressed Composite Joints with Concrete-Encased CFST Columns
Table 4
Displacement ductility factor of specimens.
| | Specimens | Loading direction | Yielding load (kN) | Yielding displacement Δy (mm) | Peak load Pu (kN) | Ultimate displacement Δu (mm) | Displacement ductility factor (μ = Δu/Δy) | Mean displacement ductility factors () |
| | S-1 | Forward | 224.1 | 23.6 | 255.4 | 105.0 | 4.46 | 4.23 | | Backward | −233.8 | −26.3 | −262.9 | −105.0 | 3.99 |
| | S-2 | Forward | 235.6 | 24.7 | 271.4 | 104.0 | 4.21 | 3.96 | | Backward | −239.1 | −28.2 | −273.2 | −104.4 | 3.71 |
| | S-3 | Forward | 239.7 | 25.8 | 261.1 | 101.6 | 3.93 | 3.79 | | Backward | −239.2 | −28.7 | −273.4 | −105.0 | 3.65 |
| | S-4 | Forward | 204.8 | 22.1 | 233.7 | 87.5 | 3.96 | 3.84 | | Backward | −190.6 | −22.2 | −225.4 | −82.6 | 3.72 |
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