Seismic response of secondary structures located at different levels of a building

Chen & Soong (1988) stated that for PSSI to have a significant effect on structural responses, μ must be at least 10%. The mass and frequency of the secondary structure were selected so that μ is 12% and η is 8.90. Examples of the the selected secondary structure in actual scale include generators, computer system, and communication tower.

2.2 Ground motion