考虑土-结相互作用的大型LNG储罐振动台试验研究  

Research progress on the high-frequency decay parameter kappa(κ)of Fourier amplitude spectrum of acceleration

作　　者：陶正如[1,2] 张孟骋昊 赵一鸣 郝俊 肖培 TAO Zhengru;ZHANG Mengchenghao;ZHAO Yiming;HAO Jun;XIAO Pei(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080

出　　处：《世界地震工程》2025年第2期137-146,共10页World Earthquake Engineering

基　　金：国家重点研发计划课题(2022YFF0608904);黑龙江省杰出青年基金项目(JC2018018)。

摘　　要：为研究土-结相互作用(soil-structure interaction, SSI)对大型LNG(liquefied natural gas)储罐模型结构地震响应的影响,通过开展缩尺比为1/50的振动台试验研究,对比分析了LNG储罐模型在不同输入地震动作用下的试验现象、加速度响应、位移响应和峰值应变,以及储液的动水压力响应。同时,还与相同加载条件的刚性地基结构模型的振动台试验结果进行了一定的对比。结果表明:罐体的最小相对位移出现在外罐壁和穹顶的连接处,约为0.6~2.0 mm,并且罐身的相对位移大于穹顶的相对位移;靠近外罐与穹顶的连接处,会产生加速度突变的现象,随着输入地震动幅值的增大,内罐底部的加速度峰值随之增大;在一些关键节点中,外罐底部的峰值应变最大,在记录工况下最大可达30με,因此需要格外关注外罐壁与底板的连接处;对于动水压力的分布,可以看出动水压力随着罐体高度的增加而减小。此外,柔性地基下外罐的加速度以及动水压力大于刚性地基。High-frequency filters,f max and kappa(κ)have been developed for strong motion synthesis,ground motion prediction equation,seismic zoning and site amplification effect,since the high-frequency decay of acceleration Fourier amplitude spectrum was studied in 1980s.In engineering seismology,the high-frequency decay parameterκis an important yet least understood parameter.The computational methods,applications,influencing factors and physical mechanisms have been the focus of ongoing research.According to the frequency band of ground motion used inκ/κ0 calculation,the research methods are reviewed as limited bandwidth method and broadband method.It also reviews recent research hotspots,including the applicability of the Anderson and Hough method,the influence of soil nonlinearity and ground motion directionality.By understanding the research progress ofκ,it lays a foundation for proposing more reasonable methods,in order to reduce the uncertainties in ground motion estimation,seismic hazard assessment and seismic zoning.

关 键 词：LNG储罐 SSI 振动台试验 地震响应 加速度响应 

分 类 号：TU378[建筑科学—结构工程]