高聚物牺牲包层对钢筋混凝土板的爆炸毁伤缓解效应

为研究高聚物牺牲包层对钢筋混凝土结构的爆炸毁伤缓解效应，开展了带高聚物牺牲包层钢筋混凝土板的接触爆炸试验，同时设置了普通钢筋混凝土板作为对照组，对比分析了高聚物牺牲包层对钢筋混凝土板毁伤特征的影响。此外，运用AUTODYN软件建立了现场爆炸试验的SPH-FEM耦合模型，通过与试验结果的对比，验证了所建耦合模型的可靠性。在此基础上，通过参数敏感性分析，探究了炸药量和高聚物牺牲包层密度、厚度对带高聚物牺牲包层钢筋混凝土板毁伤特性以及吸能特性的影响。结果表明：接触爆炸下，高聚物牺牲包层能够有效地分散爆炸荷载，缓解爆炸荷载对钢筋混凝土板的冲击作用，具有良好的防护性能；药量在一定范围内增大时，高聚物牺牲包层依然能维持较高的吸能水平，增大包层密度和厚度有利于增强高聚物牺牲包层的吸能特性，包层厚度的变化会造成被保护钢筋混凝土板毁伤模式的改变。

Damage mitigation effect of polymer sacrificial cladding on reinforced concrete slabs under blast loading

The blast resistance of sacrificial cladding has been extensively studied in the field of blast protection. As a polymer material with a cellular structure, non-water reactive foaming polyurethane also has the potential to act as a sacrificial cladding due to its good mechanical properties. In order to study the blast damage mitigation effect of polymer sacrificial cladding on reinforced concrete structures, a contact explosion test on the reinforced concrete slab with polymer sacrificial cladding was carried out, while an ordinary reinforced concrete slab was set as the control group, and the effect of polymer sacrificial cladding on the damage characteristics of the reinforced concrete slab was compared and analyzed. In addition, the SPH-FEM (coupled smooth particle hydrodynamics and finite element method) coupling model of the field explosion test was established by using AUTODYN software, and the reliability of the coupling model was verified by comparing with the test results. On this basis, the effects of explosive charge, the density, and the thickness of polymer sacrificial cladding on the damage features and energy absorption characteristics of reinforced concrete slabs with polymer sacrificial cladding were investigated through parametric sensitivity analysis. The results show that the polymer sacrificial cladding can effectively disperse the blast loads and mitigate the impact of the blast loads on the reinforced concrete slab with good protective performance under contact explosions. The polymer sacrificial cladding can maintain a high level of energy absorption even with the explosive charge increased within limits. Increasing the density and thickness of the cladding is beneficial to enhance the energy absorption ability of the polymer sacrificial cladding, while the change in thickness will cause a change in the damage mode of the protected reinforced concrete slab. The research results are helpful in providing a relevant reference for the further research and application of the new non-water reactive foaming polyurethane in the field of blast protection of engineering structures.