Specifics of natural frequency measurements for floor vibration

Cerpinska, Marina; Irbe, Martins

doi:10.22616/erdev2017.16.n031

Cited by 3 publications

(3 citation statements)

References 4 publications

(10 reference statements)

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“…The human perception of vibrations (even at low amplitudes) can be in fact magnified by psychological effects, hence resulting in possible additional unfavorable feelings. Structural glass in buildings, in this regard, can be sometimes recognized by the occupants as an "unsafe" material [60,61], and such an unpleasant perception is reasonably expected to further increase in presence of transparent walking surfaces (see Figure 3).…”

Section: Acceleration Peaks and Perception Index (Pi) Valuesmentioning

confidence: 99%

“…Accordingly, a given setup configuration should be tested involving different volunteers; • in the specific case of pedestrian glass systems, an additional influencing parameter for psychological reactions to the imposed movements can be certainly represented-at least for some of the involved volunteers-by the transparency of the walking surface. The limited size/number of restraints, with respect to the walking surface, can also manifest in a possible discomfort increase (i.e., Figure 3); • finally, it is reasonably expected that the occurrence of minimum noise during the walking experiments (i.e., due to the vibrating glass members over the steel tendons and the unilateral point restraints, see Figure 6) could represent an additional influencing parameter of interest for the feeling assessment of the volunteers, thus resulting in a potential magnification of human perceptions and annoyance, even at low levels of vibration [60,61].…”

Section: Acceleration Peaks and Perception Index (Pi) Valuesmentioning

confidence: 99%

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Reliability of Field Experiments, Analytical Methods and Pedestrian’s Perception Scales for the Vibration Serviceability Assessment of an In-Service Glass Walkway

Bedon

Fasan

2019

Applied Sciences

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The vibration performance of pedestrian structures attracts the attention of several studies, especially with respect to unfavorable operational conditions or possible damage scenarios. Given a pedestrian system, specific vibration comfort levels must be satisfied in addition to basic safety requirements, depending on the class of use, the structural typology and the materials. To this aim, guideline documents of the literature offer simplified single-degree-of-freedom (SDOF) approaches to estimate the maximum expected vibrations and to verify the required comfort limits. Most of these documents, however, are specifically calibrated for specific scenarios/structural typologies. Dedicated methods of design and analysis, in this regard, may be required for structural glass pedestrian systems, due to their intrinsic features (small thickness-to-size ratios, high flexibility, type and number of supports, live-to-dead load ratios, use of materials that are susceptible to mechanical degradation with time/temperature/humidity, etc.). Careful consideration could be then needed not only at the design stage, but also during the service life of a given glass walkway. In this paper, the dynamic performance of an in-service glass walkway is taken into account and explored via field vibration experiments. A set of walking configurations of technical interest is considered, involving 20 volunteers and several movement features. The vibration comfort of the structure is then assessed based on experimental estimates and existing guideline documents. The intrinsic uncertainties and limits of simplified approaches of literature are discussed, with respect to the performance of the examined glass walkway. In conclusion, the test predictions are also used to derive “perception index” data and scales that could support a reliable vibration comfort assessment of in-service pedestrian glass structures.

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Section: Acceleration Peaks and Perception Index (Pi) Valuesmentioning

confidence: 99%

Section: Acceleration Peaks and Perception Index (Pi) Valuesmentioning

confidence: 99%

Reliability of Field Experiments, Analytical Methods and Pedestrian’s Perception Scales for the Vibration Serviceability Assessment of an In-Service Glass Walkway

Bedon

Fasan

2019

Applied Sciences

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“…The dynamic characteristics on the floor have already been studied by several authors who contributed their research to the study of the area [22,23,24]. Among the possible conclusions in this study, it is possible to highlight the following:…”

Section: Discussionmentioning

confidence: 77%

Experimental and Numerical Dynamic Evaluation of Profiled Steel Decking Slab in a Container House Using Mems

Tavares Lima,

Ernesto de Medeiros Alas,

Narcizo de Almeida Nunes

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The reuse of shipping containers is common in civil construction, not only for ecological reasons but also for speeding up the construction time, thus favoring the decrease in the payback time of the applied financial investment. Consequently, technological developments guarantee this trend with lighter structural elements, thus occurring natural frequencies closer to the frequency ranges of dynamic excitations associated with human activities. Therefore, a direct consequence of this new design trend is a considerable increase in problems related to unwanted vibrations in steel and concrete composite slabs, which arise from rhythmic actions, and external vibrations arising from earthquakes, which must be analysed to meet the comfort and safety of residents. Thus, this study aims to present a vibration analysis in a composite floor slab, built in steel deck 59S, of a residence built with reuse maritime containers in the municipality of Gravatá in Pernambuco, Brazil. The structure consists of three floors, with the cantilever slab analysed with dimensions of 8.24 m wide and 4.00 m long. In the experimental phase, vibration analysis was carried out through the heel impact test to obtain the natural frequencies, which had average values of 7.0 Hz, and average values of 7.14% for the damping ratio of the slab, a MicroElectroMechanical System (MEMS) was used, which are accelerometers of signals present in smartphone devices. Subsequently, using the software SCIA Engineer, the numerical analysis of the model was carried out, where usual discretization techniques were used through the Finite Element Method (FEM) to evaluate the structural behavior against dynamic actions, thus obtaining the results of natural frequencies, average values of 6.46 Hz, and modal shapes. With this, it was possible to verify the results regarding the natural frequencies of vibration, analysing the usability, comfort, and health of the structure according to the current normative codes. Finally, this study presents a comparison of modal parameters in numerical and experimental simulations against the dynamic actions that must be considered in the design of steel deck slabs when in a cantilever situation for the type of structure studied to validate comfort and building safety caused by dynamic effects developed by human behavior.

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Experimental and numerical modal evaluation of profiled steel decking floor slabs in a container house using MEMS

Lima,

de M. Alas,

Nunes

et al. 2024

Engineering Structures

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Specifics of natural frequency measurements for floor vibration

Cited by 3 publications

References 4 publications

Reliability of Field Experiments, Analytical Methods and Pedestrian’s Perception Scales for the Vibration Serviceability Assessment of an In-Service Glass Walkway

Reliability of Field Experiments, Analytical Methods and Pedestrian’s Perception Scales for the Vibration Serviceability Assessment of an In-Service Glass Walkway

Experimental and Numerical Dynamic Evaluation of Profiled Steel Decking Slab in a Container House Using Mems

Experimental and numerical modal evaluation of profiled steel decking floor slabs in a container house using MEMS

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