Predicting effects of design variables on modal responses of CLT floors

Ussher, Ebenezer; Arjomandi, Kaveh; Weckendorf, Jan; Smith, Ian F. C.

doi:10.1016/j.istruc.2017.04.006

Cited by 24 publications

(6 citation statements)

References 3 publications

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“…That is because, when side edges are restrained, additional stiffness in the whole system will be introduced, which will lead to an increase in the fundamental natural frequency. According to the research conducted by Ussher et al [36], the first-mode natural frequency increases around four times when the boundary conditions of the five-ply single CLT plate transit from SFSF to SSSS. Therefore, the estimations of vibration for beam-like CLT may be conservative.…”

Section: Research Limitationsmentioning

confidence: 99%

Investigating Vibration Characteristics of Cross-Laminated Timber Panels Made from Fast-Grown Plantation Eucalyptus nitens under Different Support Conditions

Liang,

Taoum,

Kotlarewski

et al. 2024

Buildings

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The mechanical properties of fibre-managed Eucalyptus nitens (E. nitens) cross-laminated timber (CLT) have previously been extensively studied, proving the material to be structurally safe and reliable. However, the vibration performance of CLT manufactured from this relative new construction species is not yet fully understood, especially under different support conditions. In this study, three types of support conditions, including roller–roller, bearer–bearer and clamp–bearer support conditions, were examined under vibration impulse-response testing performed using a simple but effective and repeatable excitation method consisting of a basketball dropped from a known height and an accelerometer. Six three-ply E. nitens CLT panels considered to have different moduli of elasticity in different layers and one strength-class C24 spruce CLT as a controlled reference were included in this study. The results suggest that the fundamental frequency values can effectively reflect the inherent characteristics of CLT panels (bending stiffness and density); however, no obvious relationship was observed between damping ratios and these inherent properties. The values of frequency constant λ1 were determined to analyse the effect of different support conditions on the values of fundamental frequency. The average values of λ1 for the roller–roller (9.6) and bearer–bearer (10.1) supports align with the theoretical values (9.87) for simply support (S-S) conditions. However, when clamping loads were applied at one edge of the bearer support, the average values of λ1 increased up to 10.8 but remained far below the theoretical values for clamped–pinned (C-S) support (15.4).

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Section: Research Limitationsmentioning

confidence: 99%

Investigating Vibration Characteristics of Cross-Laminated Timber Panels Made from Fast-Grown Plantation Eucalyptus nitens under Different Support Conditions

Liang,

Taoum,

Kotlarewski

et al. 2024

Buildings

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“…In this latter case, this noise source is efficient at low frequencies and thus is able to excite the CLT floor at this mode too. The third mode (f 21 ) shows its typical pattern featuring four peaks [80] when using the tapping machine in position A (Fig. 13).…”

Section: Modal Analysismentioning

confidence: 99%

A comprehensive vibroacoustic investigation of a cross laminated timber floor

Caniato

Bettarello

Granzotto

et al. 2022

Construction and Building Materials

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“…As stated in section ‘Introduction’, the significance of the effect of HSI depends on the mass ratio of human to the floor. Moreover, the effect of end-support conditions on floor vibration performance has recently been addressed by several researchers (Jarnerö et al, 2015; Ussher et al, 2017; Zhang et al, 2019a) for timber floors. Similarly, the end-support conditions should be considered in the design for CFS floors.…”

Section: Parametric Studiesmentioning

confidence: 99%

Human-induced vibration of cold-formed steel floor systems: Parametric studies

Zhang

2020

Advances in Structural Engineering

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Designing a lightweight floor to prevent annoying vibrations induced by human activities is still a challenge because numerous factors need to be considered. In consequence, there is still a lack of reliable models and adequate design guidelines pertinent to the vibration serviceability of cold-formed steel floor systems. To facilitate understanding the fundamental concepts of lightweight floor vibrations for serviceability design, a newly proposed damped plate-oscillator model was adopted in this research to predict dynamic responses of cold-formed steel floors induced by human walking. Three loading methods were developed based on this model. By using these loading methods, comprehensive parametric studies involving step frequencies, mass ratios, damping ratios, walking paths and end-support restraints were conducted. The present analytical studies show that the influence of moving or stationary occupants depends on the mass ratio of occupants to the floor and its significance could be negligible for small mass ratios. In addition, the boundary restraints at floor end-supports may not always reduce floor responses. On the contrary, relatively larger responses could be excited by human walking for the restrained floors having the fundamental frequency close to the multiple of the footstep frequency.

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Predicting effects of design variables on modal responses of CLT floors

Cited by 24 publications

References 3 publications

Investigating Vibration Characteristics of Cross-Laminated Timber Panels Made from Fast-Grown Plantation Eucalyptus nitens under Different Support Conditions

Investigating Vibration Characteristics of Cross-Laminated Timber Panels Made from Fast-Grown Plantation Eucalyptus nitens under Different Support Conditions

A comprehensive vibroacoustic investigation of a cross laminated timber floor

Human-induced vibration of cold-formed steel floor systems: Parametric studies

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