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ST7-R3.10.20.22 Compression-Only Footfall Harmonic Response Analysis
Footfall analysis on pedestrian-loaded structures is typically done using the Harmonic Response solver to determine the steady-state response to a sinusoidal load. While it's common to apply the peak footfall load, this assumes the load acts in both tension and compression, but in reality, the step load behaves more like a half-sine wave. This assumption isn't necessarily conservative. A discontinuous acceleration from footfall can trigger higher frequency modes, causing harmonics (e.g., 4 Hz, 6 Hz, etc.) beyond the primary footfall frequency of around 2 Hz, which complicates the response.
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