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海洋导管架型平台是一个复杂的非线性空间结构。按照通常的方法,这种非线性结构系统不能一次确定力和位移的关系、其总刚度矩阵必须多次迭代才能完成,因而很费计算机机时。本文介绍的多层子结构摸式分析法,根据导管架型平台只是局部非线性结构的特点,把平台结构分成两类子结构模式;非线性子结构模式——桩基浅处的桩土之间相互作用的模式和线性子结构模式——桩基深处的桩模式和导管架模式。每一个子结构模式又可分成简单的超级单元和更简单的基本单元。仅仅非线性子结构漠武需要经过多次迭代求出其刚度矩阵。它与线性子结构刚度矩阵一起组装成平台的总刚度矩阵,进而进行静力和动力分析。由于非线性子结构模式比整个平台结构小得多,因而迭代过程容易完成。各种工况下的复杂的荷载也可以山各种简单的荷载模式组成,因此各种工况的静力和动力分析的结果可以一次求得。木文运用DASOS—J计算机程序(此程序是由大连工学院编制的)按此方法分析了我国渤海某平台的内力计算实例。
The offshore platform is a complex non-linear spatial structure. According to the usual method, the non-linear structure system can not determine the relationship between force and displacement at once. The total stiffness matrix must be completed by multiple iterations, so that it takes a long time to compute the machine time. In this paper, the multi-layer sub-structure touch analysis method, according to the jacket-type platform is only a local nonlinear structure characteristics, the platform structure is divided into two types of substructure mode; nonlinear sub-structure mode - Modes of interaction and linear substructure modes - Pile modes and jacket modes at depths of piles. Each sub-structure model can be divided into simple super-unit and simple basic unit. Only non-linear sub-structure of Mo Wu need to go through many iterations to find out its stiffness matrix. Together with the linear substructure stiffness matrix, it is assembled into the overall stiffness matrix of the platform, which is then subjected to static and dynamic analyzes. Because the non-linear substructure pattern is much smaller than the entire platform structure, the iterative process is easy to complete. Complicated load under various conditions can also be composed of a variety of simple load mode, so the results of static and dynamic analysis of various conditions can be obtained at one time. Using the DASOS-J computer program (this program was compiled by Dalian Institute of Technology), Mu Wen analyzed the calculation example of the internal force of a platform in Bohai Sea in China by this method.