外爆条件下冲击波与组合壳结构的相互作用

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。

Interaction of a shock wave with a composite shell structure under an external explosion

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.