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Foundation Vibration Analysis Using Simple Physical Models by John P. Wolf

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Chapter 6. Seismic Excitation

The use of the simple physical models to represent the soil for problems excited by loads acting on the structure arising from machine vibrations is well documented in the previous chapters. The case of seismic excitation addressed in the following is much more puzzling, as it is not immediately clear in what form and at what location the earthquake input should be applied. It will be demonstrated that as for the rigorous elastodynamical solution, the seismic excitation can be converted to an equivalent load acting on the dynamic system. This is to be expected. After all, if the soil is viewed generally as a linear “black box,” a non-ambiguous solution procedure must be valid, regardless whether the unknown contents ...

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