Calculation model for the thickness limit of high-strength steel-concrete composite structures under the impact of slender thin-walled projectiles
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摘要: 针对细长薄壁弹冲击下的高强钢-混凝土复合结构厚度极限计算问题，开展了细长薄壁弹冲击复合靶试验，基于试验结果分析了复合结构防护机理和弹体结构的破坏模式；在原有厚度极限计算模型的基础上，考虑了弹体结构强度这一关键因素，提出了新的厚度极限计算模型，并对相关参数经验性进行了讨论。研究结果表明：高强钢-混凝土复合结构的防护机理在于高强钢提供材料强度，混凝土背板提供支撑刚度，二者优势互补；由于细长薄壁弹体在冲击过程中易发生压缩胀裂破坏，计算模型必须考虑弹体结构强度对冲击效应的影响；复合结构的设计需同时兼顾高强钢力学性能和复合结构厚度极限2个方面。此外，本文计算模型存在参数具有经验性、计算结果偏保守等不足，后续研究还需对该模型加以修正。Abstract: The study aims to solve the problem of calculating the thickness limit of high-strength steel-concrete composite structures under the impact of slender thin-walled projectiles, a key consideration for protective engineering design. A series of impact tests on composite targets were carried out. These targets were composed of different high-strength steel plates and concrete backplates. Slender thin-walled projectiles were launched with a gas gun at controlled velocities, and the impact process were captured by high-speed cameras. The resulting damage to the structures and the failure modes of the projectiles were analyzed using both non-destructive and destructive testing methods. Based on test results, the protective mechanism of the composite structures and the failure modes of projectiles were analyzed. An improved thickness limit calculation model was then developed. Unlike the original model, this new model incorporated the structural strength of slender thin-walled projectiles, considering their wall thickness, material yield strength, and geometric dimensions, and was established based on force equilibrium and energy conservation principles. The results show that the high-strength steel in the composite structures provides material strength to resist penetration, while the concrete backplate offers support stiffness. As slender thin-walled projectiles are prone to compression and expansion cracking during impact, their structural strength must be factored into the calculation model. Moreover, the design of composite structures should consider both the mechanical properties of high-strength steel and the thickness limit. In conclusion, though the proposed model offers a new theoretical approach, it has limitations such as empirical parameters and conservative results. Further research is necessary to refine and enhance the model. The study's findings provide a theoretical basis for the design and application of high-strength steel-concrete composite structures in protective engineering.
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Key words:
- slender thin-walled projectile /
- high-strength steel /
- concrete /
- composite structure /
- thickness limit
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图 2 5 mm高强钢-90 mm C60钢筋混凝土复合靶破坏情况
Figure 2. Damage situation of 5 mm high-strength steel-90 mm C60 composite target
图 3 10 mm高强钢-120 mm C60钢筋混凝土复合靶破坏情况
Figure 3. Damage situation of 10 mm high-strength steel-120 mm C60 reinforced concrete composite target
图 4 弹体破坏情况和冲击过程
Figure 4. The damage conditions of the projectile and the impact process
图 6 高强钢-混凝土复合结构的破坏/抵抗模式
Figure 6. Failure/resistance modes of high - strength steel - concrete composite structures
图 8 弹体结构破坏下的厚度极限分析模型
Figure 8. Analytical modeling of thickness limits under damage of projectile structures
图 9 弹筒与塞块速度时程曲线的3种情况
Figure 9. 3 cases of the velocity time course curves of the cartridge and the block
图 10 速度和位移时程曲线理论预测结果
Figure 10. Theoretical prediction results of velocity and displacement time-history curves
图 11 弹体轴向应力分布理论计算结果
Figure 11. Theoretical calculation results of projectile axial stress distribution
图 12 不同冲击速度下高强钢冲切比
Figure 12. The punching ratio of high-strength steel plates under different impact velocitie
图 13 不同冲击速度下高强钢与C60混凝土板的厚度极限
Figure 13. The thickness limits of the high strenght steel and the C60 reinforced concrete backplates at different impact velocities
表 1 试验值和理论预测值的对比
Table 1. Comparison between the experimental values and the theoretically predicted values
靶体 弹速/(m·s−1) 冲切深度/mm 弹体剩余长度/mm 实测值 理论值 实测值 理论值 5 mm钢-90 mm C60钢筋混凝土 350 − 5.4 − − 10 mm钢-120 mm C60钢筋混凝土 350 3.75 4.3 170.4 172 
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