韧性水平地震作用下导管架平台非线性时程分析

Nonlinear Time History Analysis of Jacket Platform Under Ductility Level Earthquake

选取7组地震时程曲线使用非线性时程方法分析渤海某平台的抗震能力,结构的塑性利用率处于较低的水平,表明结构的抗震性能良好。在此基础上分析结构在地震作用下的响应时程,发现:结构的最大响应均出现在地震动加速度的最大时刻,但响应仍具有一定的随机性。将结构的响应转换为频域并与地震动时程的频谱特征对比发现地震可以激发结构的稳态振动。

Through 7 sets analyses,plastic utilization of structure is found at a low level,which proves that the earthquake resistance capacity of the platform in Bohai Sea is good.Based on this,the structure responses under the earthquake action is analyzed.It is found that the maximum responses of the structure is at the maximum seismic acceleration time,and the responses has a certain randomness.Comparing the response of the structure with the seismic ground motion in frequency,it is found that earthquake action stimulates steady-state vibration of the structure.