Dynamic Measurements of In-Place Steel Floors to Assess Vibration Performance

Hanagan, Linda M.; Raebel, Christopher H.; Trethewey, Martin W.

doi:10.1061/(asce)0887-3828(2003)17:3(126)

Cited by 28 publications

(23 citation statements)

References 8 publications

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“…However, if the excitation level is too great, rattling and other non-linear behaviour may be induced and hence the quality of the data will be reduced. Hanagan et al (2003) and Raebel et al (2001) both report that the location of excitation has little bearing on data quality so long as nodal lines and supports are avoided.…”

Section: Modal Property-based Methodsmentioning

confidence: 99%

“…Sensors placed at boundaries yielded erroneous results. Hanagan et al (2003) found the mounting of the sensors is critical in gaining useful data.…”

Section: Modal Property-based Methodsmentioning

confidence: 99%

“…The source of excitation for the test structure warrants careful consideration and should be dependent upon the specific test objectives; as indicated by Hanagan et al (2003). A shaker was found to yield superior quality data when compared to impact hammer excitation.…”

Section: Modal Property-based Methodsmentioning

confidence: 99%

“…Raebel et al (2001) reported that good coherence was displayed in data gained from any level of excitation, assuming that the level exceeded ambient noise levels. Hanagan et al (2003) suggested that a signal-to-noise amplitude ratio (S/N) of above 100 usually ensures high-quality data. However, if the excitation level is too great, rattling and other non-linear behaviour may be induced and hence the quality of the data will be reduced.…”

Section: Modal Property-based Methodsmentioning

confidence: 99%

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A benchmark study of dynamic damage identification of plates

Currie¹,

Petrie²,

Mao³

et al. 2012

Proceedings of the Institution of Civil Engineers - Engineering

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Vibration-based methods for damage detection of structures are researched extensively among the academic community. Yet only limited success in practice has been reported. A major hurdle is understood to be the discrepancy between the assumed availability of pertinent modal data and the measurability of such data from actual experiments. However, dedicated critical studies into the practicality and limitation of modal testing for structural damage detection are scarce. This paper presents a laboratory investigation, along with finite-element (FE) analysis, into the extent to which modal frequencies and mode shapes may be measured in a plate-like structure and their general sensitivities to different levels of damage. The order of measurable modes and the measurement accuracy are assessed on the basis of the actual measurement in conjunction with FE predictions. Changes in the measured modal properties are examined in light of the pattern and severity of damage. Results indicate that with a typical modal testing it is possible to obtain the first 5-6 modes for a plate structure with sufficient accuracy in the frequencies but with a gross error of around 10% in the mode shapes. Using solely a few measurable natural frequencies will be insufficient to identify the occurrence and the degree of crack-induced damage. Mode shapes can be more indicative of local damage in a plate, especially when it involves an edge crack.

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Section: Modal Property-based Methodsmentioning

confidence: 99%

“…Sensors placed at boundaries yielded erroneous results. Hanagan et al (2003) found the mounting of the sensors is critical in gaining useful data.…”

Section: Modal Property-based Methodsmentioning

confidence: 99%

Section: Modal Property-based Methodsmentioning

confidence: 99%

Section: Modal Property-based Methodsmentioning

confidence: 99%

See 2 more Smart Citations

A benchmark study of dynamic damage identification of plates

Currie¹,

Petrie²,

Mao³

et al. 2012

Proceedings of the Institution of Civil Engineers - Engineering

View full text Add to dashboard Cite

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“…Previous studies have shown that when these floors are lightweight and are used in projects with free architectural plans, they can be susceptible to excessive vertical vibration problems that are basically induced by humans walking on the floors (Hanagan, Raebel, & Trethewey, 2003). When the level of the generated vibrations exceeds the perception threshold of humans, it is highly likely that claims and adverse comments will be made by the users.…”

Section: Problem Descriptionmentioning

confidence: 99%

Evaluation of the vibration performance response of insulating floor panels under human walking conditions

Opazo-Vega

Anglada

Cendoya

et al. 2016

Revista de la Construcción

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Abstract:The use of lightweight prefabricated floor panels has grown considerably over the last two decades. Previous studies have shown a detrimental vibrational response of these floors under human walking conditions, resulting in user complaints. The present study evaluates the vibration performance of a newly developed construction system in Chile, composed of deck-type insulating floor panels installed in dwellings constructed with ferro-cement prefabricated construction panels. The vibrations induced by walking steps were measured in 36 dwellings of three different models. Individual synchronized walks were performed at different step frequencies with individuals of different weights. For the evaluation, the serviceability criteria and vibration performance indicators proposed in the ISO 10137 standard were used. The results show that the floor panels have an impulsive vibration response with average vertical natural frequencies of 26.14 Hz and damping ratios of 4.3%. In the dwellings with a lower damping ratio, the performance indicators presented unfavorable values when the heaviest individuals walked at the greatest step frequency. If the serviceability criteria are implemented, it is predicted that 97.22% of the floor panels will not generate significant user discomfort, validating the construction system. Keywords: vibrations in floors, vibration performance, dynamic serviceability, lightweight floors, human-induced vibrations. Resumen:El uso de entrepisos livianos y prefabricados ha crecido considerablemente en las dos últimas décadas. Estudios previos demuestran que estos pisos pueden presentar problemas vibratorios debido al caminar de las personas, generando reclamos de los usuarios. En este trabajo se evalúa el desempeño vibratorio de un sistema constructivo inédito en Chile, conformado por paneles de entrepiso aislantes tipo deck, que se instalan en viviendas construidas con muros prefabricados de ferrocemento. Se miden las vibraciones inducidas por caminatas en 36 viviendas, de 3 modelos distintos. En cada vivienda se realizan caminatas sincronizadas individuales a distintas frecuencias de paso, con sujetos de distinto peso. Para la evaluación se utilizan los criterios de serviciabilidad e indicadores de desempeño vibratorio propuestos en la norma ISO 10137. Los resultados muestran que los entrepisos tienen una respuesta vibratoria impulsiva, con frecuencias naturales verticales promedio de 26,14 Hz y razones de amortiguamiento de 4,3%. En las viviendas con menor razón de amortiguamiento, los indicadores de desempeño presentan valores desfavorables, cuando los individuos de mayor peso caminan a la mayor frecuencia de paso. La aplicación de los criterios de serviciabilidad prevé que el 97,22% de los entrepisos no generarán molestias significativas en los usuarios, validando al sistema constructivo.Palabras claves: vibraciones en pisos, desempeño vibratorio, serviciabilidad dinámica, pisos livianos, vibraciones inducidas por personas.

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Integral resonant control scheme for cancelling human-induced vibrations in light-weight pedestrian structures

Díaz

Pereira

Reynolds

2010

Struct. Control Health Monit.

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SUMMARY Integral resonant control (IRC) has been recently introduced as a simple, robust and high‐performance technique for vibration control of smart structures instrumented with collocated piezoelectric actuator–sensor pairs. This work deals with the design and implementation of an active vibration control (AVC) system based on an IRC strategy for the mitigation of human‐induced vibrations in light‐weight civil engineering structures, such as floors and footbridges, via proof‐mass actuators. This work presents a new AVC strategy that combines an approximate inversion of the proof‐mass actuator dynamics with an IRC‐based strategy. The result is a control scheme with the following desirable characteristics: (i) the closed‐loop system exhibits very high stability margins, (ii) the risk of stroke saturation at low frequencies is significantly reduced so that the saturation nonlinearity, which has to be included to keep the system hardware safe, can be designed to account only for force saturation (i.e. the actuator performance is enhanced), (iii) rigorous stability analysis and systematic design can be proposed and (iv) it is not necessary to measure the actuator force. The stability analysis is carried out using the recently developed stability theorem based on the positive feedback interconnection of systems with negative imaginary frequency response. The control scheme is validated on a full‐scale prestressed concrete laboratory structure. Excellent vibration reduction performance is reported for frequency‐response‐function‐based tests and for walking excitations. Copyright © 2010 John Wiley & Sons, Ltd.

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Dynamic Measurements of In-Place Steel Floors to Assess Vibration Performance

Cited by 28 publications

References 8 publications

A benchmark study of dynamic damage identification of plates

A benchmark study of dynamic damage identification of plates

Evaluation of the vibration performance response of insulating floor panels under human walking conditions

Integral resonant control scheme for cancelling human-induced vibrations in light-weight pedestrian structures

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