极端风暴载荷下导管架平台的动力响应分析

为评估导管架平台在极端风暴工况下的整体安全性能，基于ABAQUS有限元软件建立导管架平台的有限元模型，在极端平均风工况下对平台进行了静力分析，在极端脉动风工况下对平台进行了动力分析，重点探讨了平台在三种极端风暴工况下的应力、位移、速度及加速度响应。结果表明：平台的应力集中容易发生在桩腿桩基处，平台在极端风暴工况下的位移及应力响应均满足设计需求；平台强轴的固有频率大于弱轴的固有频率，自振周期远小于波浪周期，不会发生波激共振；平台在极端风暴工况下的位移及加速度响应极值可为结构振动监测系统的预警阈值设定提供参考。

Dynamic response analysis of jacket platform under extreme storm load

In order to evaluate the overall safety performance of jacket platform under extreme storm conditions, a finite element model of the platform is established based on ABAQUS finite element software. The static analysis of the platform is carried out under the extreme average wind condition, and the dynamic analysis of the platform is carried out under extreme fluctuating wind condition. The stress, displacement, velocity and acceleration responses of the platform under three extreme storm conditions are mainly discussed. The results shows that the platform is prone to stress concentration at the connection between pile leg and pile foundation, the displacement and stress response of the platform under extreme storm conditions meet the design requirements, the natural frequency of the strong axis of the platform is greater than the weak axis of that, and the natural vibration period is much less than the wave period, so it will not resonate. Meanwhile, the extreme values of displacement, velocity and acceleration response of the platform under extreme storm conditions can provide a basis for the setting of early warning threshold of structural vibration monitoring system.