Effects of human-induced load models on tuned mass damper in reducing floor vibration

Abstract

Dozens of human-induced load models for individual walking and jumping have been proposed in the past decades by researchers and are recommended in various design guidelines. These models differ from each other in terms of function orders, coefficients, and phase angles. When designing structures subjected to human-induced loads, in many cases, a load model is subjectively selected by the design engineer. The effects of different models on prediction of structural responses and efficiency of vibration control devices such as a tuned mass damper, however, are not clear. This article investigates the influence of human-induced load models on performance of tuned mass damper in reducing floor vibrations. Extensive numerical simulations were conducted on a single-degree-of-freedom system with one tuned mass damper, whose dynamic responses to six walking and four jumping load models were calculated and compared. The results show a maximum three times difference in the acceleration responses among all load models. Acceleration response spectra of the single-degree-of-freedom system with and without a tuned mass damper were also computed and the response reduction coefficients were determined accordingly. Comparison shows that the reduction coefficient curves have nearly the same tendency for different load models and a tuned mass damper with 5% mass ratio is able to achieve 50%–75% response reduction when the structure’s natural frequency is in multiples of the walking or jumping frequency. All the results indicate that a proper load model is crucial for structural response calculation and consequently the design of tuned mass damper device.

Dynamic Behavior of a Suspended Steel Space Frame‐Glass Composite Floor

“…In reality, the human-induced vibration response is complex and unforeseen [41][42][43]. For the vibration serviceability assessment, considering the randomness of human activities, the RMS acceleration responses [44] can be conducted as an 4.3.1. Experimental Results.…”

Application of Viscoelastic Tuned Mass Dampers in Vibration Mitigation of Steel Joist Jack Arch Floor Structures

“…By examining this table, it can be seen that a larger share of the applied load is due to the first harmony. Overall, the magnitude of the dynamic load decreases with increasing harmony [2].…”

“…A significant number of studies have been conducted over the past decades to model the dynamic loads due to human activities. e dynamic vertical load, f v (t) resulting from human walking may be expressed by the following Fourier series [2].…”

“…As seen in Figure 14, there is a significant difference between the peak acceleration values resulting from different loading models. Among the load models investigated in this paper, the model proposed by Chen et al [2] provides the largest dynamic effects in the original floor structure at load frequencies of 1.5 and 2 Hz. Nonetheless, the largest peak acceleration induced in the original floor structure under the loading frequency of 3 Hz belongs to the load model developed by Kerr [31].…”

“…e stepping rates for human walking and jogging typically range between 1.5 and 3.2 Hz [2]. In addition, the excitation from human activities also includes higher harmonic components that occur at frequencies larger than the stepping rate.…”