The dynamic characteristics and seismic response analyses of an aqueduct with a baffle ,with the consideration of soil-structure interaction (SSI) ,are carried out .By using the method of eigenfunction expansion ,the coupling motion equation be-tween the fluid and aqueduct under a given absolute aqueduct displacement is constructed .Through the least square fitting to the fractional complex polynomials ,the impedance of the surface strip foundation on elastic half space is converted into a lumped-parameter model ,which meets the frequency independence .Based on the substructure method ,the motion control e-quation of soil-aqueduct-fluid coupling system is obtained .The correctness of the method is proved by the comparison between the ADINA solutions and the Newmark-βsolutions .A systematic parameter analysis for the shear wave velocity of the soil ,the volume of the water in the aqueduct ,the length and height of the baffle is carried out .It is shown that the consideration of SSI in the design of aqueduct is necessary .%研究了考虑土与结构相互作用(SSI)效应的带隔板矩形渡槽动力特性及其地震响应.利用特征函数展开法得到渡槽和槽内流体以时间为变量的耦合运动微分方程.采用复多项式分式对弹性半空间上明置条形基础的阻抗函数进行最小二乘拟合,建立与频率无关的土体集总参数模型.最后使用子结构法得到土体-渡槽-流体耦合体系的运动控制方程,基于New mark-β法求解体系的动力响应,与ADINA结果进行了对比验证.分析了土剪切波速、充液量、隔板尺寸及位置等参数对整个体系地震响应的影响,研究表明:SSI效应对槽内流体晃动特性和动力响应的影响不可忽视.
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