Global vibration serviceability assessment of human-induced vibration of high-frequency floors considering the layout of indoor building items

Abstract

The higher-order harmonics of crowd loading can induce resonance in high-frequency floors, leading to significant amplification of vibrations and potentially causing serviceability or safety issues. Additionally, differences in item layouts on indoor floor spaces are a major factor affecting pedestrian step frequency and itineraries, which cause changes in floor vibrations. This study aimed to analyze the influence of different layouts of indoor items on human-induced vibrations of high-frequency floors. Firstly, a random high-frequency floor load model was established by combining a social force model and a pedestrian load model. A high-frequency floor with a fundamental frequency of 10.3540 Hz was used for testing to verify the soundness of the model when applied to different layout forms. Secondly, a global vibration serviceability assessment method was proposed to establish human-induced vibrations. Finally, the serviceability probability of floors with different layouts under random walking conditions was calculated, and the assessment results were provided. The results indicate that, based on the layout configurations adopted in this study, the discussion room layout is most prone to issues related to human-induced vibration serviceability under the influence of five pedestrians walking randomly, with a probability of occurrence reaching 80 %. The next most vulnerable layout is that of the classroom, where the probability is 70 %. In contrast, the meeting room layout exhibits the lowest probability of experiencing vibration serviceability issues, at 50 %, demonstrating a significant advantage in mitigating human-induced vibrations. Furthermore, an analysis of the floor's dynamic response Fourier spectra reveals that when assessing human-induced vibration serviceability, it is crucial to account for the contributions of higher-order modal shapes of the floor. The present research provides references to design and implement improved layouts for indoor items.