中文摘要：

研究基于摇摆柱的JZ20-2北高点井口平台在地震作用下的动力稳定性.应用ANSYS有限元软件,比较有无摇摆柱下海洋平台动力稳定承载能力,发现存在摇摆柱的海洋平台动力稳定承载能力有明显提升;随地震波加速度峰值增大,结构局部产生较大位移,结构临界失稳;不同地震作用下,地震作用越强,结构动力稳定临界荷载越低.通过改变连接杆、摇摆柱刚度,发现随着连接杆、摇摆柱截面面积的增大,结构动力稳定临界荷载相应提高.对于存在初始缺陷的平台结构,结构动力稳定临界荷载显著降低,并随着初始缺陷的增大,结构的动力稳定性临界荷载值越小.

英文摘要：

The action of dynamic stability of the JZ20-2north high wellhead platform with rocking columm is studied,and the dynamic stability bearing capacities of offshore platform with or without rocking column are compared by using ANSYS software.The results show that dynamic stability bearing capacity of offshore platform with rocking column has been improved significantly.With the peak of the seismic acceleration increases,the structure of local produces larger displacement,critical structural instability.Under different seismic action,the stronger the earthquake effect produces,the lower the structure dynamic stability critical load bears.By changing the stiffness of connecting rod and rocking column,it is found that as the connecting rod,rocking column sectional area increases,structural dynamic stability critical loads increase accordingly.Research platform structure of initial defects,the structure dynamic stability critical load decreases significantly,and with the increase of initial defects,the structure of the dynamic stability critical load value is smaller.