摘要
介绍了自升式平台地震响应不同分析方法的原理,分析了自升式平台与其他结构地震响应分析的不同点。利用有限元软件ANSYS建立了海洋石油92x自升式平台的有限元模型,并分别采用静力法、反应谱法及时程分析法分析了平台在二类场地、设防烈度为8度时的地震响应。对比不同分析方法,其结果表明:反应谱法较静力分析法更保守,而时程分析法对地震波的选取有很大依赖;在地震作用下平台桩腿的弦杆及斜撑受力集中;桩腿上最大等效应力小于材料的屈服强度,平台总体最大位移为0.6m,该平台能够抵抗8级烈度的地震作用。该研究可为自升式平台的抗震设计提供参考。
The different seismic response analysis methods and the differences of the seismic response between the jack-up platform and other structures are introduced. The HYSY 92x jack-up platform model is built with ANSYS software, and the seismic response is analyzed with static method, response spectrum method and time-history anal- ysis method when the secondary ground and the 8 seismic fortification intensity are considered. The analysis shows that： the response spectrum method is more conservative than the static method; the seismic response of the jack-up platform obtained with the time-history analysis method depends on the selection of seismic wave; in the leg, the stress is concentrated in the chords and the sway rods~ the maximum Von Mises stress in the chords of the leg is less than the material yield strength, and the maximum displacement is 0.6 m, so the platform can resist the seismic effect. This research can provide reference for the seismic design of the jack-up platforms.
出处
《海洋工程装备与技术》
2016年第1期31-38,共8页
Ocean Engineering Equipment and Technology
关键词
自升式平台
地震响应
谱分析
时程分析
jack-up platform
seismic response
response spectrum method
time-history analysis
