Vibration testing for dynamic properties of building floors

Nguyen, Huu Anh Tuan

doi:10.1088/1757-899x/869/5/052005

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…T.H. Nguyen [15] studied the issue of vibration testing and characterized the general features and provisions on which the process of vibration diagnostics of buildings is based. The author studied its types, active and passive, realized through the implementation of an active vibration load.…”

Section: Discussionmentioning

confidence: 99%

Vibration Test of a High-Rise Monolithic Building

Tuleyev

2023

GEOMATE

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The relevance of the study is due to the lack of land for Almaty city development. The study purpose is to study the behavior specifics of a 35-story residential building in Almaty city under seismic loads according to calculations during its design. To study the set task, an experimental study of the dynamic load was carried out using a B-3-type vibration machine. Thus, the paper considers the results of dynamic tests of a 35-story building with a frame-wall construction. Dynamic tests were carried out using a vibration machine with an inertial effect installed on the building floor. Vibration recording was carried out using a digital instrument-measuring system. In the course of the study, insignificant differences were revealed in the calculated and experimental values of the vibration periods. When determining the design seismic loads on facilities of such type, the values of logarithmic vibration decrements are recommended to be taken within 0.12-0.18 (ξ=2-3%). Among the conclusions, the need to amend regulatory documents in construction, as well as the following observation of the high-rise were identified.

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Section: Discussionmentioning

confidence: 99%

Vibration Test of a High-Rise Monolithic Building

Tuleyev

2023

GEOMATE

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“…On the other hand, resonance would be less important compared with transient response in a high-frequency floor with a fundamental frequency greater than 9-10 Hz [8][9][10]14]. The damping ratio of a floor, which represents the vibrational energy dissipation, depends not only on the material and structural type but also on the architectural components and nonstructural elements attached to the floor [15,16]. Cao et al tested a long-span prestressed concrete floor to be used in the lounge of a major airport.…”

Section: Introductionmentioning

confidence: 99%

Vibration Performance of Flat Plate Concrete Floors With Codified Minimum Thickness

Nguyen¹

2022

GEOMATE

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Limiting vibrations to ensure occupant comfort is a serviceability requirement that should be considered in the design of floor systems. Current concrete design codes do not explicitly address the issue of vibrations when providing guidelines for calculation of the slab thickness of a flat plate floor. Concrete codes have introduced several methods of determination of the slab thickness or span-to-thickness ratio on the basis of deflection control. The objective of this article is to investigate to what extent a flat plate floor with codified minimum thickness would meet the requirement for walking-induced vibration control. The modal properties of flat plate floors spanning 6-9 m were determined and the 90th percentile velocity response to walking excitation was calculated using probability-based design charts developed by a European guideline on floor vibrations. For deflection control, on average the floor designed following the European concrete code was 6% thinner than the floor designed using the American concrete code and 34% thinner than the floor designed according to the Australian concrete code. It was interestingly found that the vibration of a floor that was dimensioned for deflection control as per any of the three concrete design codes well met the acceptance criteria for human comfort in office buildings, residential buildings, hotels and schools. In addition, the vibration of a 9-m-span floor whose slab thickness was determined using the Australian concrete code provisions could even be acceptable for critical areas.

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“…However, the damping level of a floor is much more difficult to evaluate as the damping depends not only on the material and construction type of structural members but also on the non-structural elements or architectural components attached to the floor. Some types of dynamic testing such as include heel drop impact, hammer impact and forced vibration testing with an electrodynamic shaker can be utilized to estimate the floor modal properties including the damping ratio [16]. Alternatively, it is possible to refer to the damping values given in current guidelines for typical floor structures constructed from different material with different levels of furnishing.…”

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confidence: 99%

Reliability Analysis of Floors for Vibration Performance

Nguyen

2022

Civil and Environmental Engineering

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In this paper, the vibration serviceability of a two-bay composite floor under walking excitation was evaluated via both deterministic and stochastic methods. The floor framing was irregular with one bay being about 25 % longer than the other. Using the deterministic approach recommended by a widely recognized design guide, it was predicted that the vibration levels in both floor bays due to footfall were deemed acceptable in terms of human comfort in an office environment. The stochastic approach took account of random variations in the floor modal properties, the loading and the tolerance vibration limit. Statistical properties of the random variables were determined by reference to contemporary floor vibration guidelines as well as a modal analysis of the finite element model of the floor. Close-formed formulas for use with the first-order reliability method were developed to predict the failure probability of the floor. Reliability analysis using Monte Carlo simulation with a sufficiently large number of trials was also performed. Both of the analytical and numerical reliability analyses revealed an exceedance probability of around 36 % for the longer floor bay, which was in marked contrast to the deterministic method. For the shorter floor bay, a failure probability of practically zero was found by the random procedures. Furthermore, the excellent agreement between the results acquired from the first-order reliability method and the Monte Carlo simulation highlights the effectiveness of the former approach which requires much less computation effort.

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Vibration testing for dynamic properties of building floors

Cited by 5 publications

References 5 publications

Vibration Test of a High-Rise Monolithic Building

Vibration Test of a High-Rise Monolithic Building

Vibration Performance of Flat Plate Concrete Floors With Codified Minimum Thickness

Reliability Analysis of Floors for Vibration Performance

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