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Experimental and numerical uncertain vibration analysis of multilayered timber structures assembled using compressed wood dowels

Abstract : This study presents an experimental and numerical investigation on the vibrational serviceability performance of novel adhesive free engineered wood products (AFEWPs), namely adhesive free laminated timber beams (AFLB) and adhesive free cross-laminated timber panels (AFCLT), assembled through thermo-mechanically compressed wood dowels (CWD). The experimental modal analyses were carried out under free-free conditions using a hammer impact. Natural frequencies, mode shapes, and damping ratio were assessed experimentally. In addition, similar glued timber beams (conventional glulam) were manufactured and tested for comparison purpose. A 3D FE model was developed and validated by comparison against experimental data and then used to predict the vibrational behavior of a realistic flooring system made with AFCLT panel measuring 4.5 m x 5.5 m. A parametric study was performed on the FE model to maximize the floor stiffness. The predicted FE results were discussed with regard to the Eurocode 5 vibrational serviceability design requirements showing acceptable vibrational performance. A simplified FE model was then developed to reduce computational cost. The variability level of the results for the AFEWPs was also studied and discussed. The numerical variability of frequencies of the AFEWPs was investigated based on the development of the Modal Stability Procedure (MSP). The MSP result was first compared with the FE result in the nominal case. Then, the statistic results (mean value, standard deviation, coefficient of variation and distribution) obtained from the MSP were compared with the results from the classical method (direct Monte Carlo simulation) and experimental results. A quick error estimation between the MSP and the direct Monte Carlo simulation was developed. Finally, the mean and standard deviation of the frequencies of the realistic AFCLT flooring system were predicted by the MSP.
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Theses
File URL :
https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2020_0202_BUI.pdf
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https://hal.univ-lorraine.fr/tel-03184623
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Submitted on : Monday, March 29, 2021 - 4:27:45 PM
Last modification on : Tuesday, March 30, 2021 - 3:27:42 AM

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  • HAL Id : tel-03184623, version 1

Citation

Tuan Anh Bui. Experimental and numerical uncertain vibration analysis of multilayered timber structures assembled using compressed wood dowels. Mechanics of materials [physics.class-ph]. Université de Lorraine, 2020. English. ⟨NNT : 2020LORR0202⟩. ⟨tel-03184623⟩

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