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Modal analysis of CLT beams: Measurements and predictive simulations

Bondsman, Benjamin LU ; Flodén, Ola LU ; Danielsson, Henrik LU orcid ; Persson, Peter LU and Serrano, Erik LU orcid (2022) 8th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2022 p.56-62
Abstract
Cross-laminated timber (CLT) as a prime example of an innovative product within the field of civil engineering has over the recent years attracted attention of the construction industry and engineers around the world. As a natural composite with different orientation of layers in addition to anisotropic properties of wood, CLT can be a challenging material in predictive numerical modelling. This is possibly due to uncertainty in the mechanical behaviour of the material owing to its growing conditions. In addition, timber structures are more sensitive to vibrations and structure-borne sound at low frequencies than conventional concrete based structures. Therefore, a thorough understanding of dynamic characteristics of CLT and accurate... (More)
Cross-laminated timber (CLT) as a prime example of an innovative product within the field of civil engineering has over the recent years attracted attention of the construction industry and engineers around the world. As a natural composite with different orientation of layers in addition to anisotropic properties of wood, CLT can be a challenging material in predictive numerical modelling. This is possibly due to uncertainty in the mechanical behaviour of the material owing to its growing conditions. In addition, timber structures are more sensitive to vibrations and structure-borne sound at low frequencies than conventional concrete based structures. Therefore, a thorough understanding of dynamic characteristics of CLT and accurate predictive models can enhance its potential in the construction industry. This work presents a numerical and an experimental modal analysis of CLT beams within a frequency range relevant for vibrations and structure-borne sound. In the experimental investigation, a series of CLT beams with dimensions 120 120 2000 [mm3], cut from a larger CLT plate, composed of two covering layers of Norway spruce and a mid-layer of Scots pine are studied. Resonant frequencies, bending and torsional modes are utilised for a thorough study of the beams. The results are presented in terms of statistical variation in experimental resonant frequencies. Furthermore, a numerical sensitivity study with respect to variation in the mechanical properties of CLT is presented. (Less)
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author
; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
modal analysis, Cross-laminated timber (CLT), Experimental dynamics, resonance frequency
host publication
Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems : Proceedings of The Eighth International Conference on Structural Engineering, Mechanics and Computation, 5-7 September 2022, Cape Town, South Africa - Proceedings of The Eighth International Conference on Structural Engineering, Mechanics and Computation, 5-7 September 2022, Cape Town, South Africa
editor
Zingoni, Alphose
article number
3
pages
6 pages
publisher
CRC Press/Balkema
conference name
8th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2022
conference location
Cape Town, South Africa
conference dates
2022-09-05 - 2022-09-07
external identifiers
  • scopus:85145580276
ISBN
9781003348443
DOI
10.1201/9781003348443-9
language
English
LU publication?
yes
id
7a1cad7f-0f11-465b-a172-dea5acebba7f
date added to LUP
2022-09-17 18:29:29
date last changed
2023-04-06 07:44:05
@inproceedings{7a1cad7f-0f11-465b-a172-dea5acebba7f,
  abstract     = {{Cross-laminated timber (CLT) as a prime example of an innovative product within the field of civil engineering has over the recent years attracted attention of the construction industry and engineers around the world. As a natural composite with different orientation of layers in addition to anisotropic properties of wood, CLT can be a challenging material in predictive numerical modelling. This is possibly due to uncertainty in the mechanical behaviour of the material owing to its growing conditions. In addition, timber structures are more sensitive to vibrations and structure-borne sound at low frequencies than conventional concrete based structures. Therefore, a thorough understanding of dynamic characteristics of CLT and accurate predictive models can enhance its potential in the construction industry. This work presents a numerical and an experimental modal analysis of CLT beams within a frequency range relevant for vibrations and structure-borne sound. In the experimental investigation, a series of CLT beams with dimensions 120 120 2000 [mm3], cut from a larger CLT plate, composed of two covering layers of Norway spruce and a mid-layer of Scots pine are studied. Resonant frequencies, bending and torsional modes are utilised for a thorough study of the beams. The results are presented in terms of statistical variation in experimental resonant frequencies. Furthermore, a numerical sensitivity study with respect to variation in the mechanical properties of CLT is presented.}},
  author       = {{Bondsman, Benjamin and Flodén, Ola and Danielsson, Henrik and Persson, Peter and Serrano, Erik}},
  booktitle    = {{Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems : Proceedings of The Eighth International Conference on Structural Engineering, Mechanics and Computation, 5-7 September 2022, Cape Town, South Africa}},
  editor       = {{Zingoni, Alphose}},
  isbn         = {{9781003348443}},
  keywords     = {{modal analysis; Cross-laminated timber (CLT); Experimental dynamics; resonance frequency}},
  language     = {{eng}},
  month        = {{09}},
  pages        = {{56--62}},
  publisher    = {{CRC Press/Balkema}},
  title        = {{Modal analysis of CLT beams: Measurements and predictive simulations}},
  url          = {{http://dx.doi.org/10.1201/9781003348443-9}},
  doi          = {{10.1201/9781003348443-9}},
  year         = {{2022}},
}