Study on Collapse Resistance of RC Frame under the Corner Column Removal Scenario
Abstract
:1. Introduction
2. Experimental Program
2.1. Design and Fabrication of Specimen
2.2. Details of Steel Reinforcements and Concrete
2.3. Test Setup and Loading System
2.4. Instrumentation
3. Experimental Results and Discussion
3.1. Experimental Phenomena and Failure Mode
3.1.1. Elastic Stage
3.1.2. Elastic-Plastic Stage
3.1.3. Plastic Damage Stage
3.2. Vertical Displacements of Frame Components
3.3. Strain Evolution, Distribution and Internal Force from Strain Measurements
4. Calculation for Ultimate Resistance to Progressive Collapse
4.1. Calculation for Resistance Supplied by DAP Beams
4.2. Calculation for Resistance Supplied by DAP Slab
4.3. Calculation for Total Resistance Supplied by DAP Components
5. Analysis of Progressive Collapse Resistance Mechanisms
5.1. Flexural Mechanism
5.2. Compressive Arch Mechanism
6. Conclusions
- Under monotonic vertical loading on the corner column, the specimen underwent three stages, including compressing elastic stage, elastic-plastic stage and plastic damage stage.
- Crack patterns developed in the frame specimen. Flexural cracks appeared in slabs P1, P2 and P3. In particular, both flexural cracks and twist cracks emerged in the beams of DAP. Plastic hinges firstly appeared in the farther end of TB-1 because of its greater stiffness and finally formed in the farther ends of LB-1 and TB-1. A plastic hinge line was completely acquired in the diagonal of P1.
- The calculated resistance was approximately 79% of the experimental peak load, which is possibly due to the three following reasons: the contributions of deformed energy of IAP members, the increased sections yield of beams in DAP and the mutual effect between all components. The calculated resistance of the slab contributes greatly to the total structure’s resistance.
- Flexural mechanisms of members in DAP and compressive arch mechanisms of components in IAP are mainly resistance mechanisms in the progressive collapse of structures under a corner column loss scenario. Moreover, the Vierendeel mechanism at large deformation stages in 3D RC frame structure needs to be further investigated in the future.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Conflicts of Interest
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Material | d, mm | fy, MPa | fu, MPa | E, MPa | |
---|---|---|---|---|---|
Steel bars | HPB300 | 8 | 310 | 372 | 2.08 × 105 |
Iron wire | 3 | 395 | 450 | 2.01 × 105 | |
fc, MPa | E, MPa | ||||
Concrete | C25 | 26 | 2.81 × 104 |
Loading Displacement, mm | 0 | 11.12 | 22.16 | 31.2 | 35.21 | 41.7 | 51.5 | 83.4 | 127 |
---|---|---|---|---|---|---|---|---|---|
B5T | 6 | 54 | 88 | 110 | 111 | 111 | 112 | 114 | 115 |
B5M | −3 | −33 | −57 | −68 | −74 | −76 | −79 | −87 | −102 |
B5B | −12 | −133 | −220 | −269 | −283 | −288 | −296 | −319 | −334 |
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Xu, J.; Wang, S.; Liu, K.; Quan, X.; Dong, F. Study on Collapse Resistance of RC Frame under the Corner Column Removal Scenario. Materials 2021, 14, 7157. https://doi.org/10.3390/ma14237157
Xu J, Wang S, Liu K, Quan X, Dong F. Study on Collapse Resistance of RC Frame under the Corner Column Removal Scenario. Materials. 2021; 14(23):7157. https://doi.org/10.3390/ma14237157
Chicago/Turabian StyleXu, Jin, Sheliang Wang, Kangning Liu, Xiaoyi Quan, and Fangfei Dong. 2021. "Study on Collapse Resistance of RC Frame under the Corner Column Removal Scenario" Materials 14, no. 23: 7157. https://doi.org/10.3390/ma14237157