Acceleration Response Analysis of a Steel-wood Composite Floor System under Human-induced Vibration

To investigate the vibration response of a steel-wood composite floor system under walking and jump excitation. The ABAQUS subroutine Vdload is used to simulate the human walking and jumping process on the structure, while the human-induced excitation is equated to a combination of a Fourier-scale load model and a biomechanical model of mass, stiffness, and damping (MSD) to study the human-induced vibration response under human-structure interaction (HSI). The effects of walking and jumping excitation on the peak acceleration of the structure are also considered. The results show that the peak acceleration of the structure considering the human-structure interaction is significantly smaller than that without the human-structure interaction, and the results obtained from the numerical simulation analysis are more consistent with the experimental situation. In addition, the acceleration response of the steel-wood composite floor system under jump excitation is larger than that of walking excitation, and the peak acceleration increases with the increase of jump frequency. Then: any floor, no matter its structural configuration and material, is prone to vibrate under walking and jumpimg excitation if the excitation frequency is in resonance with one of its main frequencies. The induced vibrations affect the floor serviceability, when the induced peak acceleration exceeds the comfort requirements. The magnitude of the induced peak acceleration is the larger, the larger the acting force and the lower the vibrating floor mass and its damping.