Analytical, numerical and experimental assessment of vibration performance in timber floors

Casagrande, Daniele; Giongo, Ivan; Pederzolli, Federico; Franciosi, Alessandro; Piazza, Maurizio

doi:10.1016/j.engstruct.2018.05.020

Cited by 44 publications

(26 citation statements)

References 5 publications

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“…The use of the monitoring data allows to confirm that the existing bridges can withstand increased load conditions; monitoring experience also allows improving mathematical models and the design of structures of future bridges. Some of the latest research and experiments are presented in the literature [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Two different loading methods were developed to investigate the dynamic effects caused by people crossing a footbridge. The comparison of experimental and finite element model (FEM) results revealed that the footbridge in operation is within the limit values of comfort requirements in terms of its vibrations.Symmetry 2020, 12, 657 2 of 21 bridges [6,7]. Standards (EN 1990, ISO 10137, EN 1991/AC) list the allowed parameters of vibrations (i.e.…”

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confidence: 99%

“…Monitoring the ambient environment, that is, wind, transportation, pedestrians or a huge 48 equipment nearby, is the most frequent type of bridge monitoring. The fact that people are sensitive 49 to low frequency vibrations is one of the reasons why dynamic experiments are performed on bridges 50 [6,7]. Standards (EN 1990, ISO 10137, EN 1991-2/AC) list the allowed parameters of vibrations (i.e.…”

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confidence: 99%

“…Symmetry 2020, 12, 657 2 of 21 bridges [6,7]. Standards (EN 1990, ISO 10137, EN 1991/AC) list the allowed parameters of vibrations (i.e.…”

mentioning

confidence: 99%

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The Influence of Different Loads on the Footbridge Dynamic Parameters

et al. 2020

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Bringing together the experience and knowledge of engineers allowed building modern footbridges as very slender structures. This in turn has led to structural vibration problems, which is a direct consequence of slender structures. In some footbridges, this problem occurs when natural construction frequencies are close to excitation frequencies. This requires a design methodology, which would ensure user safety and convenience of use of the footbridge in operation. Considering the aforementioned dynamic response, the analysis of the finite element model of a footbridge was conducted focusing on critical acceleration and deformation meanings. The model was based on the footbridge prototype located in Vilnius, Lithuania. Two different loading methods were developed to investigate the dynamic effects caused by people crossing a footbridge. The comparison of experimental and finite element model (FEM) results revealed that the footbridge in operation is within the limit values of comfort requirements in terms of its vibrations.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

“…Symmetry 2020, 12, 657 2 of 21 bridges [6,7]. Standards (EN 1990, ISO 10137, EN 1991/AC) list the allowed parameters of vibrations (i.e.…”

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confidence: 99%

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The Influence of Different Loads on the Footbridge Dynamic Parameters

et al. 2020

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“…On the other hand, in the last decade, only a few studies have focused on damping ratio estimations for in-situ timber floors. Initially, some researchers analyzed the damping ratios for traditional timber floors in the context of elementary schools [9] and multi-family buildings [10]. These floors generally had a main resistant structure composed of a series of engineered timber beams up to 12 m in length (I-joist, web-joist), oriented strand board (OSB) or plywood boards nailed or screwed on their upper edge to receive concrete topping, and gypsum boards at their bottom edge to increase fire resistance.…”

Section: Introductionmentioning

confidence: 99%

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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