Field Testing and Investigation of the Dynamic Performance and Comfort of Timber Floors

Xiong, Haibei; Kang, Jiahua; Lü, Xilin

doi:10.3130/jaabe.10.407

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…The damping ratios found both for the laboratory floors and the in-situ floors are higher than those indicated by other researchers. As stated before, the ranges of damping ratios reported by other studies were between 0.52% and 4.78% for laboratory floors [3][4][5][6][7][8] and between 0.47% and 9.10% for in-situ floors [9][10][11][12]. These values contrast to some extent with the ranges reported in the present study, which were between 1.9% and 4.9% for laboratory floors and from 4.3% to 14.8% for in-situ floors.…”

Section: Fundamental Damping Ratioscontrasting

confidence: 90%

“…The damping ratios obtained for the first resonant mode varied between 0.47% and 9.10%. Subsequently, with the rise of industrialized construction, other researchers concentrated on studying the damping ratios of prefabricated timber floors for eight-story timber frame residential buildings [11] and five-story multi-family apartment buildings [12]. These floors generally had a main resistant structure composed of CLT slab panels and glulam beams, which often interacted with sophisticated ceiling systems and lightweight partition walls.…”

Section: Introductionmentioning

confidence: 99%

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Damping Assessment of Lightweight Timber Floors Under Human Walking Excitations

2019

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Vibrations on timber floors are among the most common serviceability problems in social housing projects. The presence of low damping levels on these floors could cause excessive vibrations in a range of frequency and amplitude that generate discomfort in users. This study focuses on the influence of the damping ratio in the dynamic serviceability of social housing timber floors due to walking excitations. More than 60 human-walking vibration tests were conducted on both laboratory and in-situ timber floors. The floors were instrumented with accelerometers, and fundamental modal damping ratios were estimated by applying Enhanced Frequency Decomposition Domain (EFDD) and Subspace Stochastic Identification (SSI) methods. The vibration dose value (VDV) was used to estimate the dynamic serviceability of floors. The results indicated that timber floors had an impulsive-type vibration response, with fundamental damping ratios between 1.9% and 14.8%, depending on their constructive characteristics. The in-situ floors had damping ratios between two to three times greater than the laboratory floors due to the presence of non-structural elements. Finally, it was possible to demonstrate that the floors with the highest damping ratios reached lower vibration dose values and, therefore, a better dynamic serviceability performance.

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Section: Fundamental Damping Ratioscontrasting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Damping Assessment of Lightweight Timber Floors Under Human Walking Excitations

2019

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“…In the last six years, the field studies conducted by Parnell, Davis & Xu (2010) and Xiong, Kang & Lu (2011) stand out. In the first study, the vibration performance of different construction typologies of lightweight floors with cold-formed metallic beams was evaluated.…”

Section: State Of the Artmentioning

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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“…Then they decrease as the damage accumulates (Xing et al, 2010). Field tests have been conducted to investigate the vibration frequency, damping ratio, and root-mean-square acceleration, all of which should be considered during design (Xiong et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Fundamental Tests on a Structural Health Monitoring System for Building Structures Using a Single-board Microcontroller

Tani

Yamabe

2015

Journal of Asian Architecture and Building Engineering

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Aiming at the extension of structural health monitoring systems, a new monitoring system with low cost and easy installation was developed in this study. The proposed system includes MEMS acceleration sensors for measuring, a single-board microcontroller GR-SAKURA for processing, and a wireless device, XBee-PRO, for communicating. Acceleration data are collected by microcontroller and transferred by wired or wireless devices to a PC for real-time monitoring. To verify the measuring performance of the proposed system, fundamental shaking table tests were conducted on a small-scale three-story specimen. Data collection and measuring accuracy were verified. The system's applicability to structural health monitoring systems was assessed. Experimental results showed that the response accelerations and natural frequencies of the specimen measured using the proposed system coincided well with those measured using a conventional data logger. GR-SAKURA has sufficient processing capability. XBee-PRO was confirmed to satisfy basic communication requirements equal to a wired system. Therefore, the proposed system is applicable for structural health monitoring systems with high cost-performance and simple construction.

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Field Testing and Investigation of the Dynamic Performance and Comfort of Timber Floors

Cited by 6 publications

References 3 publications

Damping Assessment of Lightweight Timber Floors Under Human Walking Excitations

Damping Assessment of Lightweight Timber Floors Under Human Walking Excitations

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

Fundamental Tests on a Structural Health Monitoring System for Building Structures Using a Single-board Microcontroller

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