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导出了适合于基底多支点输入的结构－地基－结构相互作用系统动力方程，比较了地面输入和基底输入两种激励方式对结构地震反应的影响，得到了结构－地基－结构相互作用的一些规律
The dynamic equations of the structure-foundation-structure interaction system suitable for the multi-support input of the substrate are derived. The influences of the ground excitation and the substrate input on the seismic response of the structure are compared, and some laws of structure-foundation-structure interaction are obtained.