Structural Engineering and Mechanics

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Structural damping for soil-structure interaction studies

  • Lutes, Loren D. (Dept. of Civil Engineering, Texas A & M University) ;
  • Sarkani, Shahram (Dept. of Civil Engineering, George Washington University)
  • Published : 1995.03.25
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Abstract

A soil-structure interaction formulation is used here which is based on consideration of the dynamics of the structure with a free, rather than a fixed, base. This approach is shown to give a quite simple procedure for coupling the dynamic characteristics of the structure to those of the foundation and soil in order to obtain a matrix formulation for the complete system. In fixed-base studies it is common to presume that each natural mode of the structure has a given fraction of critical damping, and since the interaction formulation uses a free-base model, it seems natural for this situation to assign the equal modal damping values to free-base modes. It is shown, though, that this gives a structural model which is significantly different than the one having equal modal damping in the fixed-base modes. In particular, it is found that the damping matrix resulting in equal modal damping values for free-based modes will give a very significantly smaller damping value for the fundamental distortional mode of the fixed-base structure. Ignoring this fact could lead one to attribute dynamic effects to interaction which are actually due to the choice of damping.

Keywords

References

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  4. Stochastic analysis of seismic structural response with soil-structure interaction vol.8, pp.1, 1999, https://doi.org/10.12989/sem.1999.8.1.053
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