Research Article
Experimental Investigation of Progressive Collapse of Prestressed Concrete Frames after the Loss of Middle Column
Table 1
Design parameters of the specimens.
| Specimen | Span of frame beam (mm) | Clean span-to-depth ratio of frame beam | Initial effective prestress | Prestress action modes |
| S1 | 2600 | 12.0 | N/A | N/A | S2 | 2300 | 10.5 | 0.6 fptk | Unbonded prestress | S3 | 2600 | 12.0 | 0.6 fptk | Unbonded prestress | S4 | 2900 | 13.5 | 0.6 fptk | Unbonded prestress | S5 | 2600 | 12.0 | 0.6 fptk | Bonded prestress |
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