基于桩-土相互作用的内河架空直立式码头地震响应分析
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摘要
采用有限元法,分别建立桩-土-码头结构模型、地基刚性假定的码头模型和工程计算简化的码头模型。通过模态分析和动力时程分析,得出3种码头模型的基频和水平位移最大值,以及码头立柱内力的最大响应值。研究表明:与地基刚性假定模型相比,由桩-土-码头结构模型所得的结构基频、水平位移最大值、立柱的剪力和弯矩值将会减小,轴力值基本不受影响;与工程计算简化模型相比,结构的基频、立柱的剪力和弯矩值将增大,但是水平位移最大值将减小,轴力值基本不变。
Three structural models of wharf structure using finite element method,i.e.,a pile-soil-structure interaction model,a model based on stiff foundation,and a model based on the fixity point of piles were analyzed in this paper.Through modal analysis and time history analysis,fundamental frequencies,maximum horizontal displacements,and maximum responses of the inner forces of column were obtained.The results show that, compared with the model based on stiff foundation,the pile-soil-structure interaction model leads to lower fundamental frequencies,maximum horizontal displacements,as well as shears and bending moments of column, but axial loads of column are almost identical between both models.Compared with the model based on the fixity point of piles,the pile-soil-structure interaction model leads to higher fundamental frequencies,higher shears and bending moments of column,and lower maximum horizontal displacements;axial loads of column are almost identical between both models.
Three structural models of wharf structure using finite element method,i.e.,a pile-soil-structure interaction model,a model based on stiff foundation,and a model based on the fixity point of piles were analyzed in this paper.Through modal analysis and time history analysis,fundamental frequencies,maximum horizontal displacements,and maximum responses of the inner forces of column were obtained.The results show that, compared with the model based on stiff foundation,the pile-soil-structure interaction model leads to lower fundamental frequencies,maximum horizontal displacements,as well as shears and bending moments of column, but axial loads of column are almost identical between both models.Compared with the model based on the fixity point of piles,the pile-soil-structure interaction model leads to higher fundamental frequencies,higher shears and bending moments of column,and lower maximum horizontal displacements;axial loads of column are almost identical between both models.
引文
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[2]贾宏宇.框架集装箱码头结构抗震分析[D].重庆:重庆交通大学,2009.
[3]郑子龙,郑昕阳.水运工程水下震动台的应用研究与进展[J].水道港口,2010,31(3):214-229.ZHENG Z L,ZHENG X Y.Construction and application of underwater shaking table for water transport engineering[J].Journalof Waterway and Harbor,2010,31(3):214-229.
[4]刘立平.水平地震作用下桩-土-上部结构弹塑性动力相互作用分析[D].重庆:重庆大学,2004.
[5]杨小卫.桩-土-结构动力相互作用的数值分析[M].武汉:武汉理工大学,2006.
[6]黄建勇,王多垠.内河架空直立式集装箱码头结构计算模型探讨[J].水道港口,2008,39(1):59-62.HUANG J Y,WANG D Y.Study on calculation model of inland river suspended vertical container terminal[J].Journal of Waterway and Harbor,2008,39(1):59-62.
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