Footfall-Induced Vibration in Longspan Composite Steel Beams Used in Two Projects at the University of Auckland

Numerically Evaluation of Dynamic Behavior of Post-Tensioned Concrete Flat Slabs under Free Vibration

“…They concluded from experiments that the lower the harmonic, the greater the vibration generated by the resonance. Pate and Built [13] found that for floor systems with the natural frequency of less than four times the pedestrian load frequency, the pedestrian load lead to an accumulation of vibrations, which is referred to as resonant excitation. For floors with natural frequency higher than four times the pedestrian load frequency, the response is mainly generated by the impulse load corresponding to the heel strike, with the vibration being a transient response to each individual impact of the pedestrian load.…”

“…The calculated Response factor R enables the forced vibration performance of the slab to be evaluated by comparing it to standard specifications. According to the guidance in SCI P354 Section 7.5 [21], after finding the natural frequency of the post-tensioned concrete slab, the dynamic response can be calculated using the Equation (13).…”

“…esponse f actor R = a rms 0.005 (13) where: a rms = the root mean square (RMS) acceleration of slab. SCI divides floors into high frequency floors and low frequency floors according to the fundamental frequency, and there are different methods for calculating the RMS acceleration for the two types of floors…”