中文摘要：

海洋结构物动力特性的研究对于海洋结构物的疲劳寿命估算和疲劳损伤预测具有重要的意义.我们建立了简易导管架平台模型,对随机波激励下平台的频域振动响应进行了分析.利用莫里森方程在惯性体系下对双甲板导管架平台的载荷以及振动位移响应进行了推导计算.采用有义波高分别为15m、20m、25m的Pierson-Moskowitz（P-M）波高谱对其进行研究.结果表明,在相同频率下,有义波高大的波浪对导管架平台响应的影响更大.在得到振动位移响应谱后对每个几何坐标下位移的方差以及振动位移响应的极值进行了计算与探讨.

英文摘要：

The dynamic characteristic of marine structures is of importantance to the fatigue life estimation. We established a simple model to analyze the frequency response of the platform under random wave excitation. The load and the vibration displacement response of the double deck jacket platform were derived by using the Morrison equation under the inertial system. The Pierson-Moskowitz （P-M） spectra of wave heights of 15 m, 20 m, 25 m were obtained. The results showed that, under the same frequency, the wave height had greater impact on the response of the jacket platform. We also discussed the variance of the displacement and the extreme value of the response of the vibration displacement.