【作者】 王燕；

【导师】 李华军；

【作者基本信息】 中国海洋大学 ， 港口、海岸及近海工程， 2003， 博士

【摘要】 导管架式海洋平台是当前应用较为广泛的一种平台结构形式。本文在总结国内外对海洋平台结构动力分析研究现状的基础上，针对浅海导管架式海洋平台的型式与结构特点，研究了导管架式海洋平台结构阻尼隔振体系及其减振效果，为了充分发挥阻尼器的耗能减振作用，提出了在平台结构导管架端帽和甲板之间设置柔性阻尼层的新型阻尼隔振方案。针对某一典型平台结构，建立了海洋平台结构阻尼隔振体系简化计算模型，进行了波浪荷载工况和地震工况的数值模拟，研究了隔振参数与结构阻尼比的关系以及它们对结构整体和隔振层层间相对位移的控制效果，运用复模态理论研究了位于较深水位的固定式导管架海洋平台在随机波浪力作用下考虑结构与波浪相互作用时运动方程中非经典阻尼的解耦问题，获得了结构响应的解析解。计算与分析结果表明，阻尼隔振方案是导管架式海洋平台的一种有效的减振措施。复模态变换解决结构阻尼与线性化后的水阻尼迭加后不具有经典阻尼的特点而产生的计算问题，针对某典型钢质海洋平台在考虑和不考虑波浪力与平台结构相互作用的两种情况下，进行了动力响应数值分析和研究。当采用考虑结构与流体相互作用的复模态分析方法，将使海洋平台结构在随机荷载作用下的响应分析更为精确和合理。更多还原

【Abstract】 Jacket is the most widely used offshore platform structural style. First of all, the paper summarizes the present achievements of dynamic analysis for offshore platform, and studies both the vibration isolation system for jacket and vibration-suppressed effectiveness. Considering the style and character of jacket, and in order to make best use of dampers to reduce vibration, a damping isolation scheme, in which the damping layer is laid between the jacket cap and deck is put forward. Then a simplified computational modal of damping isolation systems is established for a platform structure, and the relationships between the parameters of isolation layer and structural damping ratio, including their vibration-suppressed effect on the whole structure and the relative displacement of isolation layer are studied, and the simulation analysis under several representative load case of random wave force and earthquake affairs is performed. Under random wave force, using complex mode theories, non-classically damp problems considering the interaction between the structure and wave, lying in deepwater, are studied. And the resolution solution of structural response are achieved.The results of calculating and analysing show that adding damping isolation to a jacket is an effective way to reduce vibration for offshore platforms. The problem of non-classically damp, after the structure’s damp and linear water’s damp are added up, are solved by way of complex mode transformation, and the dynamic responses of a offshore platform are studied under the circumstances of thinking about the mutual effect or not. Because the complex mode analysis takes mutual effect between the structure and water into account, the better precise and reasonable responses of the offshore platform under random loads can be achieved.更多还原