Interaction of a shock wave with a composite shell structure under an external explosion
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摘要: 为研究冲击波与组合壳结构的相互作用，针对带防护墙的地面直立钢筋混凝土组合壳结构，考虑结构安置于地面和周边围土2种工况，开展结构爆炸实验，分析了结构外表面冲击波荷载分布及振动特性。实验结果表明：冲击波作用下，结构外表面爆炸荷载主要产生在冲击波绕射过程，确定荷载时应考虑冲击波压力在绕射传播过程中的自然衰减；整个结构中与冲击波最早接触的构件先产生振动，而后由于结构整体参与使得振动频率降低，振动幅值减小；结构周边围土可降低防护墙迎爆部分构件的振动频率，减小防护墙和组合壳的振动幅值。Abstract: In order to investigate the interaction of the shock wave on a reinforced concrete composite shell structure with the external protecting wall, the explosion experiments were carried out. There were two conditions in the experiments, the first condition was that the test structure was located on the ground, and the second one was that the test structure was surrounded by soil. The blast wave load distribution and the vibration characters of the structure were analyzed. The experimental results are as follows. Under external shock wave attack, the structure surface explosion load was mainly formed in the shock wave diffraction process. When determining the structure surface blast load, the shock wave pressure attenuation in the diffraction process should be considered. The structure component which first contacts with the shock wave first begins to vibrate, then the vibration frequency and amplitude decrease because the whole structure takes part in vibration gradually. In the experimental conditions, the soil surrounding the structure could reduce the vibration frequency of the protecting wall component which meeting shock wave, and reduce the vibration amplitudes of the protecting wall and the composite shell structure.
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Key words:
- shock wave /
- cylindrical shell /
- interaction /
- blast load /
- structure vibration
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图 5 加速度传感器的分布图 (单位:mm)
Figure 5. Distribution diagrams of acceleration sensors (unit in mm)
图 7 H=1.1 m时防护墙表面各点的压力
Figure 7. Overpressure-time curves at various pressure test points on the surface of the protecting wall when H=1.1 m
图 8 L=4.8 m，H=1.1 m时，柱壳表面各点的压力
Figure 8. Overpressure-time curves at various pressure test points on the surface of the cylindrical shell when L=4.8 m and H=1.1 m
图 9 冲击波与柱壳结构相互作用示意图
Figure 9. The interaction between the shock wave and the cylindrical shell structure
图 10 模型结构迎爆面反射压力对比
Figure 10. Reflected pressure of the blast side on the model structure
图 11 防护墙迎爆面荷载对比
Figure 11. Explosion pressure of the blast side on the protecting wall
图 12 各测点的加速度时程曲线 (Q=160 g，工况1)
Figure 12. Acceleration-time curves at various test points (Q=160 g, the first condition)
图 13 各测点的加速度时程曲线 (Q=300 g，工况1)
Figure 13. Acceleration-time curves at various test points (Q=300 g, the first condition)
图 14 各测点的加速度时程曲线(Q=300 g，工况2)
Figure 14. Acceleration-time curves at various test points (Q=300 g, the second condition)
图 15 各测点的加速度时程曲线(Q=450 g，工况2)
Figure 15. Acceleration-time curves at various test points (Q=450 g, the second condition)
图 16 2种工况下各测点的加速度时程曲线(Q=300 g)
Figure 16. Acceleration-time curves at various test points under two experimental conditions (Q=300 g)
图 17 不同条件下测点3的加速度时程曲线
Figure 17. Acceleration-time curves at test point 3 under different experimental conditions
图 18 防护墙各测点的应变时程曲线 (Q=160 g，L=4.8 m，工况1)
Figure 18. Strain-time curves at various test points of the protecting wall (Q=160 g, L=4.8 m, the first condition)
图 19 圆形柱壳底部各测点的应变时程曲线
Figure 19. Strain-time curves at various test points on the base of the circular cylindrical shell
表 1 爆炸实验条件
Table 1. Explosion experiment conditions
实验编号 工况 Q/g L/m H/m 压力测点编号 加速度测点编号 应变测点编号 1 1 160 4.8 1.1 1, 2, 3, 4, 5, 6, 7, 8 1, 2, 4, 5, 6 1, 2, 3, 4, 5, 6, 7, 9, 10 2 1 160 4.8 1.1 1, 2, 3, 4, 5, 6, 7, 8 1, 2, 4, 5, 6 1, 2, 3, 4, 5, 6, 7, 9, 10 3 1 300 6.3 1.1 1, 2, 3, 4, 5, 6, 7, 8 1, 2, 4, 5, 6 1, 2, 3, 4, 5, 6, 7, 9, 10 4 1 160 4.8 1.1 1, 4, 6, 7, 8, 9, 10, 11 1, 2, 3, 4, 5, 6 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 5 1 300 4.8 1.1 2, 4, 6, 7, 8, 9, 10, 11 1, 2, 3, 4, 5, 6 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 6 1 300 4.8 1.1 2, 4, 6, 7, 8, 9, 10, 11 1, 2, 3, 4, 5, 6 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 7 2 300 4.8 1.1 7, 8, 9, 10, 11 1, 2, 3, 4, 5 4, 5, 9, 10 8 2 450 4.8 1.1 7, 8, 9, 10, 11 1, 2, 3, 4, 5 4, 5, 9, 10 9 2 450 4.8 1.1 7, 8, 9, 10, 11 1, 2, 3, 4, 5 4, 5, 9, 10 
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