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钢筋混凝土在爆炸载荷下的力学行为研究是防灾减灾与防护工程领域的重要研究课题.在离散元框架内,开发了模拟钢筋混凝土结构;在爆炸载荷下破坏过程的三维梁-颗粒模型,在弹性范围内,用矩阵位移法描述梁的变形与受力的关系,提出了用应力表达梁的强度准则.基于Cowper-Symonds理论,开发了描述钢筋在高加载率荷载下变形的梁-颗粒模型.采用C++语言开发了模拟程序.进行了钢筋混凝土板在爆炸载荷下破坏规律的实验研究,同时用开发的模型进行了数值模拟,模拟结果与实验结果的对比表明:模拟结果与实验结果基本一致,所开发的模型可以反应爆炸载荷下钢筋混凝土材料的破坏特征,能够真实地体现爆坑的形成、裂纹的扩展、层裂等现象.
The research on the mechanical behavior of reinforced concrete under explosive load is an important research topic in the field of disaster prevention and reduction and protection engineering.A three-dimensional beam-particle model of simulated reinforced concrete structure and failure process under explosive load has been developed in the framework of discrete element Based on the theory of Cowper-Symonds, a beam-particle model describing the deformation of steel bars under high loading is developed. The relationship between beam deformation and force is described by matrix displacement method. The simulation program was developed by using C ++ language.Experimental research on the failure law of reinforced concrete slab under blast load was carried out and the numerical simulation was carried out with the developed model.The comparison between simulation results and experimental results shows that the simulation results are in good agreement with the experimental ones . The developed model can reflect the failure characteristics of reinforced concrete materials under blast loading, which can truly reflect the formation of crater, crack propagation and delamination.