Research Article
Effects of Soil-Structure Interaction on Torsionally Coupled Base Isolated Machine Foundation under Earthquake Load
Table 1
Natural frequency obtained from the FE analysis.
| | Case | Natural frequency in lateral mode (Hz) | Natural frequency in torsional mode (Hz) | | Without SSI | With SSI | % change | Without SSI | With SSI | % change |
| | Torsionally uncoupled | 3.26 | 2.30 | 29.40 | 4.48 | 3.31 | 26.20 | | Torsionally coupled | er = 0.05 | 3.11 | 2.21 | 28.91 | 4.32 | 3.35 | 22.53 | | er = 0.15 | 2.75 | 2.00 | 27.52 | 4.05 | 3.24 | 19.93 |
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