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 引用本文: 朱擎, 李述涛, 陈叶青, 马上, 魏万里, 张生, 陈嘉琳. 高强钢-钢筋混凝土复合防护结构厚度极限计算方法. 力学学报, 待出版.
Zhu Qing, Li Shutao, Chen Yeqing, Ma Shang, Wei Wanli, Zhang Sheng, Chen Jialin. Calculation of the thickness limit of high-strength steel-reinforced concrete composite protective structures. Chinese Journal of Theoretical and Applied Mechanics, in press.
 Citation: Zhu Qing, Li Shutao, Chen Yeqing, Ma Shang, Wei Wanli, Zhang Sheng, Chen Jialin. Calculation of the thickness limit of high-strength steel-reinforced concrete composite protective structures. Chinese Journal of Theoretical and Applied Mechanics, in press.

## CALCULATION OF THE THICKNESS LIMIT OF HIGH-STRENGTH STEEL-REINFORCED CONCRETE COMPOSITE PROTECTIVE STRUCTURES

• 摘要: 为探究弹体高速冲击下, 高强钢-钢筋混凝土复合防护结构的穿甲侵彻机理和厚度极限计算方法, 为此类复合防护结构设计提供依据和参考, 文章通过弹体侵彻复合靶模型试验确定了高强钢-钢筋混凝土复合结构的穿甲模式, 对前覆高强钢板与钢筋混凝土背板的受力情况进行解耦分析, 建立了高强钢-钢筋混凝土复合防护结构临界穿甲理论模型; 基于冲击动力学理论, 建立了无背板支撑下高强钢、无限厚背板支撑下高强钢与钢筋混凝土背板共3类厚度极限控制方程, 提出该类复合防护结构整体厚度极限计算方法; 设计开展了弹体侵彻高强钢-C40钢筋混凝土复合靶验证性试验, 试验结果证明了计算方法的可靠性, 揭示了复合防护结构抗侵彻机理; 根据理论模型的假设, 最后对计算方法的适用性和误差进行了讨论. 研究结果表明: 理论计算结果总体与试验验证的结果相吻合, 由于不考虑弹体质量损失与材料动态应变率效应等因素, 理论计算的厚度极限结果较试验验证数据偏高, 对于工程防护设计而言偏向安全.

Abstract: In order to investigate the armor-piercing penetration mechanism and thickness limit calculation method of high-strength steel-reinforced concrete composite protective structure under the high-speed impact of projectile, and to provide the basis and reference for the design of this kind of composite protective structure, this paper determines the armor-piercing pattern of high-strength steel-reinforced concrete composite structure through projectile penetration model test of composite target, and carries out the decoupling analysis of the force of the front-covered high-strength steel plate and the reinforce concrete backboard, and establishes a theoretical model of the critical armor penetration of high-strength steel-reinforced concrete composite protective structure. Based on the impact dynamics theory, a total of three types of thickness limit control equations are established for high-strength steel without backboard support, high-strength steel with infinite thickness backboard support, and reinforced concrete backboard, and an overall thickness limit calculation method for high-strength steel-reinforced concrete composite protective structure is proposed in combination with the thickness limit. At the same time, the validation test of projectile penetration into the high-strength steel-C40 reinforced concrete composite target was designed and carried out, and the test results proved the reliability of the calculation method and revealed the anti-penetration mechanism of the high-strength steel-reinforced concrete composite structure. Finally, the applicability and error of the calculation method are discussed according to the assumptions of the theoretical model. The results of the research show that the theoretical calculation results are generally consistent with the results of experimental verification, proving that the theoretical model can effectively predict the thickness limit of composite structures. Since the mass loss of the projectile and the dynamic strain rate effect of the material are not taken into account, the theoretically calculated thickness limit results are higher than the experimental validation data, which is on the safe side for the design of engineering protection.

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