离岸深水港轻型码头在波浪作用下动力响应研究

Dynamic response research of offshore deepwater light pier under wave action

对离岸深水港轻型码头在强浪作用下的动力响应进行研究，依据JTJ213—1998《海港水文规范》的环境条件和环境荷载规范，在考虑桩-土耦合效应下对海洋极端波况下离岸深水港轻型码头结构的动力响应进行了数值模拟：并对比了不同阻抗处理下桩柱响应与采取基岩面固结简化下的不同。研究结果表明，桩土耦合作用对于波浪尤其是不规则波作用下的桩柱响应有很大影响，考虑耦合作用时结构运动响应为岩面固结简化下的45％-65％，在不规则波作用下码头结构响应峰值远高于规则波下峰值结果，尤其不规则波的高频成分更能激发结构物的动力响应。建议在深水轻型码头结构物设计中采取更接近实际的基于两相饱和介质理论的桩基阻抗；在不规则波作用下尤其当频率较高时，不规则波中高频成分与轻型码头的固有频率接近易引起较大动力响应，在工程设计中需引起注意。

In this article, the dynamic responses of offshore deepwater light pier under extreme waves are investigated. According to the codes of harbor hydrology （ JTJ 213--1998）, fluid-structure coupling effect is taken into account, comparative analysis is made for the responses with different pile-soil impedances. Results show that pile-soil interaction has great impaction to the response of the pier in open sea environment. When take the pile-soil interaction into consideration, the response of the pier is only 45%-65% of that without pile-soil interaction. The dynamic response of the pier is greater under random wave than regular wave, and the response is much bigger especially with high wave frequency By these conclusions, the impedance under more realistic two phase saturation medium is advised. For that response will be much bigger when wave frequency close to structure natural frequency, it should be pay more attention when the pier subjected to random wave especially with high frequency.