考虑平台—群桩—水流—土体相互作用的导管架式海洋平台振动特性研究

文章分别采用平台—群桩—水流—土体相互作用模型和考虑附加水质量的等效桩模型,对三维平台结构在地震作用下的响应结果进行了比较研究。研究表明,等效桩模型的动力响应结果要大于考虑平台—群桩—水流—土体相互作用模型。分别采用平台—群桩—水流—土体相互作用的三维分析模型和简化模型计算平台的固有频率,通过比较两种模型的计算结果,对简化模型进行了频率修正,提出修正系数关系曲线。这种方法节省计算时间,提高计算精度,可为海洋平台的振动特性计算提供参考。

Study on Vibration Characteristic of Jacket Platform Considering the Structure-Pile-Fluid-Soil Interaction

The Structure-Pile-Fluid-Soil interaction model and the equivalent pile model with addi-tional water are respectively used to study the dynamic response of a three-dimensional(3D) platform structure under seismic force. It shows that the response result of the equivalent pile model is larger than that of the Structure-Pile-Fluid-Soil interaction model. Then, the frequency of the two models is calculated respectively.By comparing the frequency result of the two models,the frequency of sim-plified equivalent pile model is modified, thereafter the modified coefficient relation curve is pro-posed.The method proposed in the paper provides a reference for the vibration calculation of offshore platforms.