High-pile wharf is an important port structure and may suffer from accidental explosions or terrorist bombing attack during the service life. The reinforced concrete (RC) pile is one of the popular vertical load-bearing piles of high-pile wharf structure. As a main load-bearing member of the high-pile wharf structure, the damage of RC pile due to underwater explosive may cause subsequently progressive collapse of the whole structure. In this paper, the dynamic response and failure mode of RC pile in high-pile wharf structure under the near-field non-contact underwater explosion are investigated using a combined experimental and numerical study. First, a typical RC pile was designed and tested for the near-field non-contact underwater explosion. The failure mode and damage of the RC pile specimen were obtained and analyzed. Second, the numerical model of the RC pile under near-field non-contact underwater explosion was established by adopting the commercial software AUTODYN, and then validated based on experimental results. It was shown that the results from numerical model and experimental test compared very well in terms of the damage pattern and lateral displacement. Furthermore, the full-scale numerical model of the RC pile for the near-field non-contact underwater explosion was developed based on the validated numerical model to investigate the damage pattern and failure mode of RC pile under varied underwater explosives. Lastly, the safety distance for the RC pile for the underwater explosion loading with consideration of different explosive mass, the explosive depth and the concrete strength was suggested. The outcome of this study presented reference for analysis, assessment and design of the type of RC pile for high-pile wharf structure subjected to near-field non-contact underwater explosion.

中文翻译：

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钢筋混凝土桩近场非接触水下爆炸试验与数值研究

高桩码头是重要的港口构筑物，在使用年限内可能会遭受意外爆炸或恐怖爆炸袭击。钢筋混凝土(RC)桩是目前流行的高桩码头结构竖向承重桩之一。钢筋混凝土桩作为高桩码头结构的主要承重构件，水下炸药对钢筋混凝土桩的破坏可能导致整个结构随后进行性倒塌。本文采用试验与数值相结合的方法，研究了近场非接触水下爆炸作用下高桩码头结构RC桩的动力响应及破坏模式。首先，针对近场非接触水下爆炸设计并测试了典型的RC桩。获得并分析了RC桩试件的破坏模式和破坏情况。第二，采用商业软件AUTODYN建立了RC桩在近场非接触水下爆炸作用下的数值模型，并根据实验结果进行了验证。结果表明，数值模型和实验测试的结果在损伤模式和横向位移方面的对比非常好。此外，在经过验证的数值模型的基础上，建立了RC桩近场非接触水下爆炸全尺寸数值模型，研究了RC桩在不同水下爆炸物作用下的破坏模式和破坏模式。最后提出了考虑不同爆炸质量、爆炸深度和混凝土强度的钢筋混凝土桩在水下爆炸荷载下的安全距离。本研究结果为分析提供参考，