Experimental and numerical study of G-UHPC composite slab against contact blast
- Publication Type:
- Journal Article
- Citation:
- Baozha Yu Chongji/Explosion and Shock Waves, 2024, 44, (6)
- Issue Date:
- 2024-06-01
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| Filename | Description | Size | |||
|---|---|---|---|---|---|
| 地聚物超高性能混凝土复合板抗接触爆炸试验与数值模拟.pdf | Accepted version | 9.57 MB |
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In order to improve the blast resistance performance of engineering structures to ensure the safety of important targets and reduce the adverse effects of high cement content on the environment of cement-based ultra-high performance concrete, a new type of composite slab based on geopolymer ultra-high performance concrete (G-UHPC) is proposed. Three G-UHPC composite slabs were prepared with G-UHPC, steel wire mesh, and energy-absorbing foam materials, and an ordinary concrete slab was prepared with C40 concrete. Explosion tests were carried out in the field to verify the blast resistance performance of the new G-UHPC composite slab. The crater diameter, depth, and spalling of each specimen under a 0.4 kg TNT contact explosion were obtained, and the blast resistance performance and failure mode were analyzed. The effects of G-UHPC, steel wire mesh, and energy-absorbing foam materials on the blast resistance performance of concrete slabs were discussed. Based on the explosion test results, a refined finite element model was established using LS-DYNA finite element analysis software and numerical simulation analysis was conducted. The effectiveness of the numerical model was verified by comparing the experimental results with the simulation analysis results. On this basis, the model was used to further analyze the impact of G-UHPC and steel wire mesh on the blast resistance performance of concrete slabs. The failure process of composite slabs was analyzed by simulating the propagation of explosive waves in energy-absorbing foam-reinforced G-UHPC composite slabs, and the failure mechanism of G-UHPC composite slabs was revealed. A parameter analysis was carried out to further study the blast resistance performance of the G-UHPC composite slab. Based on the damage morphology of the G-UHPC composite plate, the mid-span displacement of the plate bottom and the energy absorption of the energy-absorbing layer, the influence of the energy-absorbing foam material layout on the blast resistance performance of the G-UHPC composite slab was discussed. The research results indicate that replacing ordinary concrete with G-UHPC can effectively improve the blast resistance of concrete slabs, and steel wire mesh can reduce the degree of blast pits and peeling damage of concrete slabs. The blast resistance design of composite slabs must consider the compressibility of energy-absorbing foam material and its matching with the wave impedance of G-UHPC, to have a favorable impact on the blast resistance performance of composite slabs. The high compressibility and low shear strength of energy-absorbing foam are the main reasons for the punching failure of concrete slabs. The increase in the number of polyurethane foam plates will lead to the reduction of the blast resistance performance of the concrete slab, which is specifically reflected in the increase of the depth of the explosion pit and the increase of the displacement of the bottom span of the slab.
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