Improved Methodologies for the Prediction of Footfall-Induced Vibration

Willford, Michael; Field, C. J.; Young, Peter M.

doi:10.1061/40798(190)17

Cited by 36 publications

(68 citation statements)

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“…However, different from the AISC Design Guide, RMS acceleration is adopted in the SCI Design Guide to quantify the acceleration response. The second approach "General Assessment of Establishing Vibration Response" is based on the method proposed by Willford et al [40] and Young [42], which is a frequency domain criterion of vibration serviceability specifically suitable for finite element programs. In their research, an enormous amount of footfall force was measured and the design value assigned as 75% of the fractile value of the statistical distribution.…”

Section: Sci Design Guidementioning

confidence: 99%

“…For tested floor systems with relatively low natural frequencies, the predicted acceleration from both design guides is approximately 30% higher than the experimental one, and this difference varies case by case. Hicks also compared the measured results with the finite element modelling proposed by Willford et al [40] and found that the difference is widely dispersed, although the average ratio between the two sets of values were 0.98.…”

Section: Difference Between Predictions By Design Guides and Experimementioning

confidence: 99%

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Simulations of human-induced floor vibrations considering walking overlap

et al. 2019

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Floor vibration induced by human activities has become an important concern to both designers and developers, especially for modern structures designed with larger spans and lower weights. However, there is currently no systematic approach in codes of practices to assessing floor vibration, and the load models induced by human walking are usually oversimplified by ignoring overlapping between successive footfalls. This paper addresses those shortcomings by conducting a series of finite element simulations of three slabs with different thicknesses subjected to dynamic loads induced by human walking activities. A total of six load models ranging from the most realistic to the most simplified were used for the simulations. The simulation results show that the overlapping time between successive footfalls has a significant impact on human-induced vibration for floors with thicknesses of 100-200 mm. The results also indicate that the critical walking frequency should be shifted to a higher value than the resonant frequency, to allow for the humaninduced load increasing with walking frequency.

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Section: Sci Design Guidementioning

confidence: 99%

Section: Difference Between Predictions By Design Guides and Experimementioning

confidence: 99%

Simulations of human-induced floor vibrations considering walking overlap

et al. 2019

View full text Add to dashboard Cite

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“…For high‐frequency mode loading, the guidelines use variations of the impulse equation derived by Willford et al The impulse load varies between guidelines based on the coefficient to the equation. Willford et al proposed a coefficient of 54 for design. This coefficient has been adapted by CCIP‐016 and appears to assume a 700 N (157 lb) walker.…”

Section: Introductionmentioning

confidence: 99%

Comparison of prediction and measurement techniques for pedestrian-induced vibrations of a low-frequency floor

Engelen

Graham

2018

Struct Control Health Monit

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Pedestrian footfalls are often the governing source of vibration on the upper floors of structures. These vibrations may cause discomfort for occupants or interfere with the operation of sensitive equipment. Numerous design guidelines are available to assist structural engineers in achieving vibration serviceability objectives. The current methodology is largely deterministic and does not accurately represent the stochastic nature of pedestrian-induced vibrations or the probability that walkers will generate the predicted response. Statistical analysis is applied to compare long-term vibration measurements in a commercial structure against predictions from relevant guidelines and short-term controlled walking tests. The comparison is used to evaluate the probability that vibration levels predicted by the guidelines and induced through controlled walking tests will be exceeded by typical day-to-day vibrations. The results are important for the development of future fully encompassing probabilistic models of pedestrian-induced vibrations and for aiding architects and engineers in deciding the necessity of potentially costly mitigation measures.

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“…A technical review of the microvibration sources, criteria, measurements, and mitigations can be found in reference [3]. Over the last two decades, micro-vibration has been intensively studied in concerns of human comfort and production yield for office buildings, biotechnology or metrology labs, and semiconductor fabs [4][5][6][7][8][9][10][11][12][13][14][15][16]. Vibration control for sensitive equipment by using isolation devices or active control systems [14][15][16][17][18][19][20][21][22][23][24][25] has also been widely explored.…”

Section: Introductionmentioning

confidence: 99%

A study on AGV-induced floor micro-vibration in TFT-LCD high-technology fabs

Lee

Wang

2011

Struct. Control Health Monit.

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SUMMARY This study explores vertical floor micro‐vibration induced by the automated guided vehicles (AGVs) in thin‐film‐transistor liquid‐crystal‐display (TFT‐LCD) fabs. The state‐space procedure is adopted to compute the AGV‐induced floor vibration as it preserves the desired numerical stability and accuracy in high‐frequency responses. The dynamic analysis of an AGV moving on an equivalent three‐span beam model of a TFT‐LCD building is simulated by taking into account various AGV speeds and engine forces. Numerical simulations demonstrate that if proper engine forces and excitation frequency contents of the AGV moving loads are used, the peak AGV‐induced floor micro‐vibration level can be predicted by the proposed method. Moreover, the effectiveness of vibration control by span‐reduction as well as energy‐dissipation by viscoelastic dampers is also examined. In comparison with span‐reduction, application of energy‐dissipation devices is more effective in vibration suppression as they enhance the damping characteristics of the multi‐span floor system whose natural frequencies are potentially in resonance with the excitation frequencies of the AGV moving loads ranging in a broad bandwidth. Copyright © 2011 John Wiley & Sons, Ltd.

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Improved Methodologies for the Prediction of Footfall-Induced Vibration

Cited by 36 publications

References 0 publications

Simulations of human-induced floor vibrations considering walking overlap

Simulations of human-induced floor vibrations considering walking overlap

Comparison of prediction and measurement techniques for pedestrian-induced vibrations of a low-frequency floor

A study on AGV-induced floor micro-vibration in TFT-LCD high-technology fabs

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