钢筋混凝土隔离墙抗爆性能数值模拟研究

为了研究钢筋混凝土隔离墙在爆炸荷载作用下的动态响应和抗爆性能,采用LS-DYNA有限元软件建立9 m跨度隔离墙结构简化模型,模拟了不同药量和爆炸距离下隔离墙的动态响应。将模拟结果与经验超压公式计算结果和已有试验结果对比,验证了爆炸荷载和材料参数选取的合理性,分析了结构的破坏过程、冲击波作用规律、墙面荷载分布规律和结构变形情况。结果表明:建立的数值模拟可以较好地模拟爆炸冲击波与结构的相互作用;墙面冲击波压力衰减速率与药量和爆炸距离密切相关,墙面压力衰减幅度可达97.8%。在相同药量时,随着爆炸距离增加,墙体底部压力减小,顶部冲量增加;墙体结构由小变形转变为结构整体的较大变形;比例距离小于0.376■时,墙体底部容易发生剪切破坏。模拟结果可以为抗爆隔离墙的设计提供依据。

Numerical simulation study of anti-explosion performance of the RC isolation wall

In order to study the dynamic response and anti-explosion performance of reinforced concrete isolation wall under the impact of blast load, the finite element software LS-DYNA was used to establish a simplified structural model of 9 m span isolation wall and the dynamic responses of the isolation wall under different charges and explosion distances were simulated. By comparing the simulation results with the calculated results of the empirical overpressure formula and the existing test results, the rationality of explosive load and material parameters selection was verified. The failure process of the structure, the law of shock wave action, the distribution law of wall load and the deformation of the structure were analysed. The result show that the numerical simulation established in this paper can well simulate the interaction between the blast wave and the structure and the attenuation rate of wall shock wave pressure is closely related to the charge and explosion distance, and the attenuation rate of wall pressure can reach 97.8%. At the same charge, as the explosion distance increases, the pressure at the bottom of the wall decreases and the impulse at the top increases. The wall structure changes from small deformation to large deformation of the whole structure. When the proportional distance is less than ■, the bottom of the wall is prone to shear failure. The simulation results can provide the basis for the design of the anti-explosion isolation wall.