Designing cold-formed steel (CFS) floors to prevent annoying vibrations induced by human activities such as walking is still a challenge because human occupants not only generate impact loads but also behave as dynamical systems that interacting with structures. Such interaction, known as human-structure interaction (HSI), can be significant for lightweight floor systems particularly for the case when the mass of human occupants becomes comparable to those of the floors. The aim of this study was therefore to investigate the HSI in vibration of CFS floors subjected to human walking excitations by using the recently proposed damped plate-oscillator model to predict the dynamic responses of lightweight steel floor systems with occupants. Major novelties include considering the influence of stationary and moving occupants on HSI. In particular, three loading models were developed to predict floor responses induced by human walking: models of moving force (MF), moving damped oscillators (MDO), and moving and stationary damped-oscillators (MSDO). By using these models, comprehensive parametric studies on influences of walking step frequencies, mass ratios, damping ratios and walking paths to the dynamic responses of CFS floor vibration are presented.
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