导管架海洋平台结构静力弹塑性分析方法研究

Study on pushover analysis method for jacket platforms

以渤海一座导管架海洋平台为例,分别在两种不同的控制工况下采用静力弹塑性(Pushover)方法对其在地震作用中反应进行研究,采用能力谱法确定结构目标位移,同时进行结构在相同地震动下的弹塑性时程分析。通过比较Rushover分析方法及动力时程分析方法建立的结构能力曲线、节点位移、塑性铰分布等,证明了Pushover方法在导管架海洋平台结构抗震性能评价工作中是可行的。研究结果对实际工程中抗震性能决策有一定借鉴意义。

In this paper,a jacket platform of Bohai Sea was taken as a case study.Pushover analysis was adopted for the study of its seismic behavior under earthquake of the different working conditions.Target displacement was determined with capacity spectrum method.Nonlinear time history analysis was conducted under the same earthquake.And it is also illustrated that pushover method can be employed to assess seismic vulnerability of jacket platforms by comparison of structural capacity spectra between dynamic time history analysis method and push-over analysis method.All of the above will be useful for earthquake-resistant performance decision in practical jacket platform structure.