正压冲固基础海洋平台冰激振动动力响应

正压冲固基础海洋平台是一种新型平台桩基结构形式。采用三维有限元的数值分析方法,建立了正压冲固平台的三维有限元模型。基于冰激强迫振动理论提出动冰载荷的计算方法,根据海冰破碎长度和冰速确定冰载周期,冰强度限制的水平冰力作为冰力峰值,得到的动冰载荷用于正压冲固平台的动力响应分析,并依照规范计算了6倍桩径处刚性固定时的动力响应。三维有限元方法计算得到的动力响应大于6倍桩径刚性固定时的计算结果,结构安全性评估偏于安全。

Ice-induced vibrational dynamic response of positive pressure jetting and cementing bucket offshore platform

. The positive pressure jetting and cementing bucket offshore platform is a new pile-structural platform. A 3 dimensional (3D) finite element model for the positive pressure jetting and cementing bucket platform is established by using 3D finite element analysis method. Based on the theory of ice-induced forcing vibration, a method for calculating dynamic ice load is proposed and the cycle of ice load is determined based on ice-breaking length and ice speed, while the horizontal ice force of ice intension limit is used as the peak of ice force and the obtained dynamic ice load is used for a dynamic response analysis on the platform, and the dynamic response for the rigid fixing at six-fold pile diameter is calculated according to the specification, the dynamic response calculated with 3D finite element method (FEM) is larger than that of the six-fold pile diameter for the rigid fixing. The result of structural safety evaluation shows that the platform is safe.