Deformation and failure of reinforced concrete beams under blast loading
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摘要: 利用爆炸压力模拟器进行钢筋混凝土简支梁爆炸冲击实验，详细介绍了实验设计，通过实验系统分析了钢筋混凝土(RC)梁变形破坏特征以及钢筋作用机理和对变形破坏的影响，并建立了RC梁的分离式有限元模型，利用LS-DYNA分析了实验过程，对计算结果与实验结果进行了比较，分析了误差产生的原因，得到了爆炸冲击荷载作用下RC梁的损伤破坏特征和机理，可为毁伤评估和结构抗爆设计提供参考。Abstract: With explosion pressure simulator, blast experiments were carried out to investigate the deformation and damage of concrete (RC) beams. The experimental design and parameters are described in detail. The experimental result shows the failure characteristics of RC beams and the role that rebars act. With LS-DYNA, three-dimensional separated finite element models of RC beams were established to simulate the experiment. The simulation and experimental results are contrasted to investigate the damage mechanism and failure characteristics. The article also figures out the reason of simulation errors. The research provides reference for damage assessment and anti-blast design.
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表 1 破坏现象综合描述
Table 1. Description of failure phenomenon
编号 pr/kPa pe/kPa 现象描述 BS 211 454 严重破坏：横向裂缝集中在跨中，跨中裂缝发展到梁顶处，宽度约2 cm BM 304 500 破坏：横向裂缝集中在跨中，跨中裂缝发展到梁顶处，宽度约1.5 cm BL 541 522 未破坏：沿梁长出现横向裂缝，裂缝发展到梁高约3/4处 
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表 2 钢筋计算参数
Table 2. Calculation parameters of reinforcing bar
材料 A/MPa B/MPa n C HPB235 329.11 190.44 0.26 0.016 HRB335 386.70 220.02 0.30 0.018 HRB400 404.00 232.40 0.31 0.018
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