基于国际标准的强震作用下高桩结构LNG码头桩基布置

LNG码头抗震等级要求高,抗震分析是高桩结构LNG码头需要重点研究的问题。按国际标准采用振型分解反应谱法,通过有限元软件,对不同桩基布置形式的高桩结构进行地震动力响应分析。结果表明不同桩基布置形式对结构自身刚度影响较大,从而改变结构自振周期,使结构承受不同的地震荷载;斜桩控制地震作用下的水平位移效果较好,但桩力偏大;对于具有多排多列的高桩墩式结构,桩基宜对称布置,同时边桩与内侧桩基可采用不同斜率来改善桩基受力分布情况。

Pile arrangement of pile-supported LNG terminal under strong earthquake based on international standard

LNG terminals have high seismic requirements,so seismic analysis is an important issue for LNG terminals with high pile-supported structures.In this paper,according to international standards,the modal response spectrum analysis is adopted,and the finite element software is used to analyze the seismic dynamic response of high pile-supported structures with different pile foundation layout types.The results show that different types of pile foundation layout have a greater impact on the stiffness of the structure itself,which changes the natural vibration period of the structure and allows the structure to bear different seismic loads.Batter piles have a better effect on controlling horizontal displacement under earthquakes,but the pile forces are too large;for pile-supported pier structures with multiple rows and columns,the pile foundation should be arranged symmetrically,meanwhile the side and the inner piles can adopt different slopes to improve the force condition of pile foundation.