Control of vibrations induced by people walking on large span composite floor decks

Varela, Wendell D.; Battista, Ronaldo C.

doi:10.1016/j.engstruct.2011.04.021

Cited by 78 publications

(55 citation statements)

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“…Previous studies indicated that heel-impact method can successfully reveal the dynamic behavior of structures [33,34]. For straight-knees posture, TSs were instructed to raise their heels and stand on tiptoe (Figure 7(a)) and then drop their heels suddenly and keep knees straight simultaneously (Figure 7(b)), while for bent-knees posture TSs were instructed to bend their knees as heels dropping (Figure 7(c)).…”

Section: Test Casesmentioning

confidence: 99%

Experimental and Numerical Investigation of the Effect of Standing People on Dynamic Properties of a Beam-Like Bridge

Xie

Liu

2017

Mathematical Problems in Engineering

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This paper studies the vertical dynamic properties of a beam-like bridge attached with standing people. A purpose-built lively bridge was constructed. Model properties of the empty structure are obtained using ambient vibration testing method. Experimental tests of the bridge attached with standing people were also conducted covering a variety of densities of occupants and different postures. The considerable number of participants and repetitions makes it possible to take into account inter-and intrasubject variability. To illustrate the variations of dynamic properties of the structure, a mathematic model of standing people-structure interaction system is developed employing the single degree-of-freedom (SDOF) human body model. It is shown that the model developed herein can effectively illustrate the experimental observations. Based on the model, the effect of damping and natural frequency of the human body on dynamic properties of the occupied structure is scrutinized. Results show that the modal properties of the human body contribute remarkably to the structural damping but little to the structural natural frequencies.

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Section: Test Casesmentioning

confidence: 99%

Experimental and Numerical Investigation of the Effect of Standing People on Dynamic Properties of a Beam-Like Bridge

Xie

Liu

2017

Mathematical Problems in Engineering

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“…The first four natural frequencies of the one-unit floor were determined to be 5·18, 9·14, 9·46 and 12·39 Hz. Various frequencies for different human activities have been discussed in the literature and the human walking frequency falls in the range 1·6-2·4 Hz (Varela and Battista, 2011). Considering the most unfavourable situation, the walking frequency was taken as 5·18/3 = 1·73 Hz.…”

Section: 1mentioning

confidence: 99%

“…At present, two types of dynamic control devices are common -active and passive control devices. Both can provide significant reductions in vibration amplitudes and considerably improve the dynamic characteristics of a structure and therefore user comfort (Varela and Battista, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…However, it is not always possible to make significant changes in structural elements due to architectural or even economic factors. Considering these limitations, several researchers have proposed the use of vibration control devices associated with the main structural system (An et al, 2015Gaspar et al, 2016;Reynolds et al, 2009;Santos et al, 2013;Varela and Battista, 2011). At present, two types of dynamic control devices are common -active and passive control devices.…”

Section: Introductionmentioning

confidence: 99%

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Human-induced vibration of steel–concrete composite floors

Chen

Zhang

2018

Proceedings of the Institution of Civil Engineers - Structures

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Long-span composite floors have many desirable properties and have been increasingly employed in building construction. However, these long-span structures are prone to excessive and complex vibration under human rhythmic activities such as walking, running, jumping and aerobics, which may result in people's discomfort and complaints. A finite-element numerical study was conducted to investigate the vibration behaviour of profiled steel-deck composite floors under human walking and rhythmic activities. The results indicate that human-induced vibration of composite floors is influenced by several factors, namely the load model, the floor's natural frequency, effective weight and damping ratio. In a multi-unit floor system, higher modes may be excited and these vibration components should be considered. In addition, the vibration responses of both the active unit and adjacent passive units should be taken into consideration under human walking or rhythmic activities. In multi-floor buildings, the vibration of adjacent passive floors under rhythmic activities should be considered. The comfort index can be used to evaluate human perception to the vibration of composite floors. One important step in this procedure is to determine the peak accelerations of composite floors, which can be achieved based on the developed finite-element models.

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“…Esta intensidad de percepción ha sido a su vez estudiada por muchos autores [40], que han tratado de mejorar el diseño de las estructuras para evitar los efectos nocivos de estas vibraciones, más aún si cabe con el uso de la actuales construcciones prefabricadas como los actuales paneles sándwich [41]. En general, para el rango de 1 a 10 Hz la percepción de las vibraciones se hace proporcional a la aceleración y en el rango de 10 a 100 Hz se hace proporcional a la aceleración.…”

Section: Movimientos Frecuentes Movimientos Aisladosunclassified

Estudio de la transmisión de vibraciones por impacto en losas de hormigón y mortero

Vega¹

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Tesis Doctoral: Estudio de la transmisión de vibraciones en losas de hormigón y mortero.Daniel Ferrández Vega pág. 5 RESUMENEn la actualidad existe una amplia variedad de sistemas y materiales que se emplean como atenuadores del ruido de impacto y evitan la transmisión de vibraciones en los edificios. Muchos de estos sistemas empleados en construcción, se caracterizan por desolidarizar la capa de compresión del forjado de la estructura, cumpliendo con la condición de ser materiales elásticos.Para la realización de los ensayos acústicos que permiten validar un determinado material o sistema constructivo como atenuador de este tipo de ruidos, es necesario realizar una prueba poco económica y de difícil ejecución tal y como marca la actual norma UNE-EN ISO 140. En primer lugar se necesita elaborar un forjado de referencia, que ha de ensayarse independientemente. Después, se ha de colocar la losa flotante y volver a realizar la prueba, siendo la diferencia entre las medidas realizadas la que determina la reducción al ruido de impacto.En este trabajo se presenta un sistema capaz de detectar las vibraciones y mesurarlas más sencillo y económico, consistente en un dispositivo de golpeo alternativo y un sensor capaz de recoger, una vez producido el impacto, la energía absorbida por la placa. Producido el impacto, la baldosa sufre una deformación que absorbe parte de la energía, siendo la restante transmitida a través del material y, a su vez, causante del ruido aéreo inducido en la estancia colindante. La placa absorbe su energía a través de su propia deformación, la cual se mide con ayuda del sensor capacitivo.Es por ello que para realizar este estudio de la transmisión de vibraciones y evaluar los distintos modos de transmisión a través de las estructuras, se elaboraron planchas de diferentes geometrías y dos materiales distintos, hormigón y mortero, así como, también se varió la geometría de los aislantes y su tipología, poliestireno expandido con y sin elastificar. Además, se tomaron medidas en una losa de grandes dimensiones, que puede servir como premisa para elaborar un nuevo sistema alternativo de medida del aislamiento acústico a ruido de impacto.Palabras Clave: Vibración, ruido de impacto, sensor capacitivo, hormigón, mortero, poliestireno expandido.Tesis Doctoral: Estudio de la transmisión de vibraciones en losas de hormigón y mortero.Daniel Ferrández Vega pág. 6 ABSTRACTCurrently there is a large variety of systems and materials used as impact noise attenuators and prevent the transmission of vibrations in buildings. Many of these systems used in construction are characterized by separate the compression layer of the floor of the structure, provided the condition of being elastic materials.For conducting acoustic tests which validate a particular material or construction system as attenuator such noises, it is necessary to perform an uneconomical and difficult to execute test, such evidence as marks the current UNE-EN ISO 140. First place needs to develop a forged reference to be tested independently. Then, ...

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Control of vibrations induced by people walking on large span composite floor decks

Cited by 78 publications

References 4 publications

Experimental and Numerical Investigation of the Effect of Standing People on Dynamic Properties of a Beam-Like Bridge

Experimental and Numerical Investigation of the Effect of Standing People on Dynamic Properties of a Beam-Like Bridge

Human-induced vibration of steel–concrete composite floors

Estudio de la transmisión de vibraciones por impacto en losas de hormigón y mortero

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