锦州9-3油田CEPD-SLPW平台间栈桥冰激振动分析

The Analysis of Ice-Induced Vibration on Bridge Connecting CEPD and SLPW Platform in Jinzhou 9-3 Oilfield

摘要: 平台间的栈桥作为海洋平台上的重要子结构，具备与整体平台结构完全不同的固有动力特性。本文针对锦州9-3油田CEPD与SLPW平台之间的栈桥及其附属的重要管线的工程设计，考虑平台在冰激振动事件中，平台间栈桥及其附属的重要管线上的振动响应，进行有限元分析计算，并根据计算结果进行相应的分析评价。计算发现栈桥作为平台子结构在继承了平台的冰激振动后，又由于结构特有的动力特征将平台整体传递的振动转化为其特有的振动形态，尤其是在垂向的振动水平明显放大。根据计算结果进行的相关评估见下文。

Abstract: As an important substructure of the offshore platform, the bridge connecting two platforms pos-sesses a completely different inherent dynamic nature compared with the whole structure. Based on the engineering design of the bridge and pipelines connecting CEPD and SLPW platform in Jinzhou 9-3 oilfield, an analysis on the dynamic response of the bridge structure induced by sea ice is reached in this paper by using finite element method. According to calculation result, bridge, as a platform substructure, not only inherits the ice-induced vibration of the platform, but also translates vibration from the platform into its unique form due to the dynamic characteristics of structure. Especially the vertical vibration level is significantly enlarged. The relevant evaluation is discussed afterwards according to the computing result.