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Response spectrum analysis of a simple block model

This example shows how to set up a simple brick tower model to run resonse spectrum analysis with *FREQUENCY_DOMAIN_RESPONSE_SPECTRUM. *DEFINE_CURVE and *DEFINE_TABLE are used to define ground acceleration spectra for different damping coefficients. Post-processing is done with *DATABASE_FREQUENCY_BINARY_D3SPCM. Example 10.1 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.