Floor Vibration Serviceability Problems in Wood Light-Frame Buildings

Weckendorf, Jan; Hafeez, Ghazanfarah; Doudak, Ghasan; Smith, Ian F. C.

doi:10.1061/(asce)cf.1943-5509.0000538

Cited by 19 publications

(7 citation statements)

References 5 publications

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“…17,18 Evaluation of vibration response for steel framed floor systems have been done in meeting the serviceability limits. 19,20 Weckendorf et al 21 also studied the floor vibration response of wood light weight buildings and concluded that architectural and construction detailing decisions play a major role in determining whether or not a particular building is likely to exhibit floor vibration serviceability problems. Orvin et al 22 conducted analysis of a reinforced concrete (RC) slab and compared it against a 10 Hz limit and ACI serviceability limit.…”

Section: Introductionmentioning

confidence: 99%

Minimum thickness of solid concrete floor slab with column line beams to avoid walking vibration discomfort

Zahid

Amanat

2022

Structural Concrete

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In this study, an attempt has been made to evaluate the minimum slab thickness of reinforced concrete (RC) solid floor slab with column-line beams to minimize vibration discomfort when subjected to human walking-induced excitation. An elastic time history finite element analysis methodology has been adopted for the study. An intermediate floor panel of a multistory building has been modeled using appropriate material properties, element dimensioning and stiffness modifiers. The developed model was subjected to a walking excitation using a time history function. The finite element modeling and time history analysis scheme has been validated against experimental study described in the design guide by Fanella and Mota. The study was then focused on studying the walking-induced vibration characteristics of the floor slab using the span length and slab thickness as the study parameters. The acceleration data obtained for the central point of the slab was subjected to fast fourier transform (FFT) to convert the response to the frequency domain.Comparisons were then made to obtain the minimum slab thickness for each span length using both frequency and acceleration criteria following ACI serviceability limit and the design guide limit by Fanella and Mota. It was observed that a combination of the two limits were needed to determine the minimum slab thickness. The findings will help engineers to design slabs with adequate thickness to minimize human walking-induced vibration related discomfort.

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Section: Introductionmentioning

confidence: 99%

Minimum thickness of solid concrete floor slab with column line beams to avoid walking vibration discomfort

Zahid

Amanat

2022

Structural Concrete

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“…Even though floor vibrations do not cause failure of a structure, it generally makes many people feel uneasy and will create fear of structural collapse, although such fear is unnecessary because of the small motions that are actually presented. Numerous efforts have been made to identify factors affecting human response to vibrations of joist-type floors [5][6][7][8][9][10]. It was concluded that frequency components, vibration amplitude, and damping of vibration were the most important factors affecting human response to vibrations [1].…”

Section: Introductionmentioning

confidence: 99%

Effects of Strongbacks and Strappings on Vibrations of Timber Truss Joist Floors

Xue

Zhang

Zhou

et al. 2021

Shock and Vibration

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It is well known that the vertical vibrations of lightweight timber floors would cause discomfort to the occupants. As a new kind of flooring system, the metal-plate-connected timber truss joist floors were developed due to their larger spans and easier crossing of pipes and cables after sawn timber and I-joist floors. In this paper, the vibration modes and transfer functions of sixteen metal-plate-connected timber truss joist floors over a nominal span of 6 m were determined experimentally to measure the changes in vibration frequencies and transmissions obtained after the installation of strongbacks and strappings. The results showed that the fundamental natural frequencies of the metal-plate-connected timber truss joist floors at a 400 mm joist spacing were about 15 Hz, while the frequencies of the floors at a 600 mm joist spacing were about 12.5 Hz. The bracing elements of the strongbacks and strappings mainly enhanced the system stiffness in the across-joist direction of the flooring system, but they did not govern the fundamental natural frequencies of the floors and just changed the spacing of adjacent natural frequencies. The bracing elements as secondary elements of the floors also altered the vibration transmission paths in the across-joist direction. The frequencies where the stronger vibration transfers happened in the direction perpendicular to floor joists were generally above 15 Hz. Proper installation measurements of bracing elements in practical control need to be taken to alleviate the vibration response intensity at the targeted locations and frequencies.

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“…This study demonstrated that the vibration properties of floor elements improve with increasing width, and that the influence of interconnections between elements is closely related to element width. Weckendorf et al (2014) investigated the effects of on-site horizontal transmissions within floor substructures forming contiguous flooring systems, but the boundary conditions are not comparable.…”

Section: Introductionmentioning

confidence: 99%

Effects of interconnections between timber floor elements: dynamic and static evaluations of structural scale tests

2021

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Long-span timber floor elements increase the flexibility of a building and exhibit a significant market potential. Timber floor elements are endeavouring to fulfil this potential, but building projects employing long-span timber floors have encountered drawbacks. High costs and vibration performance are challenging, and the timber industry is under substantial pressure to find attractive solutions for building components with otherwise favourable environmental features. Only a few existing studies have investigated serviceability sensitivity in relation to timber floor connections. Interconnections are inexpensive to produce and install and may offer a resource-efficient approach to improving serviceability performance. In the present study, the effect of interconnections is investigated in a full-scale structural test. Floor elements positioned in different configurations have been tested for static and dynamic performance using different types of interconnections. The observed effects of interconnection types vary according to the configuration and direction of mode shapes, and are assessed in terms of shift in frequency, damping and resonant energy. These can all be utilised in combination with observed differences in the deflection parameter. The present work demonstrates that connections between timber elements have significant effects on timber floor serviceability and may offer interesting solutions to improve the vibration performance of long-span timber floors.

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Floor Vibration Serviceability Problems in Wood Light-Frame Buildings

Cited by 19 publications

References 5 publications

Minimum thickness of solid concrete floor slab with column line beams to avoid walking vibration discomfort

Minimum thickness of solid concrete floor slab with column line beams to avoid walking vibration discomfort

Effects of Strongbacks and Strappings on Vibrations of Timber Truss Joist Floors

Effects of interconnections between timber floor elements: dynamic and static evaluations of structural scale tests

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