巨型框架海洋平台振动控制研究

Vibration Control Research of Mega-frame Offshore Platforms

巨型框架理论在陆地高层建筑物上的成功应用为构建新型平台提供了理论依据。这种新型巨型框架抗振平台由巨型柱和巨型梁组成,巨型柱承担垂直和水平两个方向的载荷,巨型梁辅助承担水平方向的载荷并将平台的重量均匀地传递给每一根巨型柱。对巨型框架抗振平台和其他三种对照平台进行静态分析、模态分析和随机载荷下的动态仿真分析表明,巨型框架抗振平台具有比较好的整体强度,可以较均匀地承担各个方向的静载荷,从而避免了局部破坏;模态分析表明,巨型框架抗振平台具有比较好的刚度、质量匹配性,具有很好的变形协调性,避免了局部畸振破坏。同时,在同样的随机载荷作用下,巨型框架抗振平台具有比较小的振动位移。除此之外,巨型框架抗振平台具有非常相似的结构,方便进行模块化生产。

The successful use of mega-frame theory for big buildings on the ground to control the vibration reminds us to investigate a new kind of platform using the theory.The concept platform is made up of major columns and major beams.The major columns stand vertical and horizontal load.The major beams endure the horizontal load and averagely transfer the weight of the platform to the columns.The static analysis,mode analysis and simulation of vibration control are performed for the concept platform and other three types of platforms for comparisons.It is concluded that the concept platform is feasible in functionality since the platform has high holistic intensity and can avoid the partial breakage because of the columns of the MFPs being more equal burden under static loadings as compared with other kinds of platforms.It can also avoid the big distortion under the severe external loadings because of the MFPs having the equal mass and stiffness distribution.And the displacement of MFPs is very small under the random external loadings.Furthermore,the MFPs will have similar structures and suitable for blocking manufacturing.