两向地震波作用下导管架平台的受力分析

导管架海洋平台多为全钢制框架结构,处于海洋的复杂环境中要承受多种荷载的作用,其中地震荷载对于这些框架式的结构的威胁是尤为突出的。本文利用流-固耦合理论将导管架平台与海水进行耦合,并且在地震荷载作用下提取平台的位移、加速度和应力,与非耦合工况进行对比。数值仿真表明:①在两向地震波作用下平台的最大位移和加速度均发生在顶部;②经过和海水耦合的平台与非耦合结构相比振动位移有所增加,但加速度与应力却减少,说明海水对导管架海洋平台是有一定的减振和保护作用的。

THE ANALYSIS OF OFFSHORE JACKET PLATFORM UNDER THE TWO DIRECTION SEISMIC WAVES

Offshore jacket platform are full steel frame structures,they support a variety of load in the complex ocean environment in which the threat of the earthquake load is particularly prominent.This paper coupled the offshore jacket platform with seawater by fluid-solid iteraction theory,and extracted displacement acceleration and stress under seismic load,then compared with uncoupled condition.Numerical simulation shows that: ① the maximum displacement and acceleration of the platform under two directions seismic waves occurred at the top;② comparing with the platform coupling with seawater and uncoupling it shows vibration displacement increase,but acceleration and stress reduce of coupling platform,and explains seawater can reduce damping of offshore jacket platform.