Understand that a structure whose natural period matches the dominant period of ground shaking (frequency ratio near 1) experiences dramatically amplified response, and that both damping and detuning the structure's period away from the ground motion reduce that amplification.
Dynamic amplification factor: DAF = 1 / √[(1 − r²)² + (2ζr)²]r = ω_ground / ω_natural (frequency ratio)Keep frequency ratio at 1 (resonance) with low damping (ζ = 0.02, the default). Confirm the amplification factor exceeds 5.
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