A simplified analysis method for seismic response of an offshore jacket platform comprises the steps that firstly, a three-dimensional structure finite element model of the jacket platform is established, the model comprises a jacket and main components of an upper module, the influence of secondary components on the structural rigidity is ignored, and the secondary components are loaded into the model in the mode of modifying the material density; the equipment weight is loaded to a corresponding gravity center position in a mass point form, meanwhile, the mass of attached water and the mass of attached marine organisms are considered in the model, and then the model is constrained by adopting an equivalent build-in pile boundary condition. And performing modal analysis on the model to obtain first-order and second-order total vibration frequencies of the model, and querying a corresponding seismic acceleration in a given seismic response spectrum according to the two-order vibration frequencies of the platform. And then loading the two horizontal seismic accelerations obtained by calculation in the previous step into the model, solving and analyzing by using finite element software, and finally evaluating. The method is simple in process and low in analysis time consumption, and about 5 hours of modeling time can be saved.
一种海上导管架平台地震响应简化分析方法,首先建立导管架平台的三维结构有限元模型,模型包括导管架以及上部组块的主要构件,忽略次要构件对结构刚度的影响,采用修改材料密度的方式加载到模型中,设备重量以质量点形式加载到对应重心位置,同时还应在模型中考虑附连水质量和附着海生物质量,其次采用等效嵌固桩边界条件对模型进行约束。对上述模型进行模态分析,获取其第一、二阶总体振动频率,在给定的地震响应谱中根据平台的两阶振动频率查询对应的地震加速度。然后将上一步计算得到的两个水平地震加速度加载到模型中,使用有限元软件求解分析,最后进行评估。本发明过程简单,分析耗时少,可节省大约5小时建模时间。
Simplified analysis method for seismic response of offshore jacket platform
一种海上导管架平台地震响应简化分析方法
2025-03-07
Patent
Electronic Resource
Chinese
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