Experimental and numerical modal analysis of a cross laminated timber floor system in different construction states

Kawrza, Michael; Furtmüller, Thomas; Adam, Christoph

doi:10.1016/j.conbuildmat.2022.128032

Cited by 13 publications

(3 citation statements)

References 18 publications

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“…where E is the elastic modulus [Pa], ρ is the average density [kg/m 3 ], fI is the first-order bending frequency [Hz], l is the length [m], and h is the thickness [m] of the specimen. The modal properties determined in laboratory tests can be used for updating numerical models and for identifying the elastic properties of timber and engineering wood products [47][48][49].…”

Section: Dynamic Tests Of Lvl Slabsmentioning

confidence: 99%

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Free Vibrations of Sustainable Laminated Veneer Lumber Slabs

Abramowicz,

Chybiński,

Polus

et al. 2023

Sustainability

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In this paper, the results of dynamic laboratory tests of four laminated veneer lumber (LVL) slabs of different thicknesses, widths, and types were presented. In three of the tested slabs, LVL with all veneers glued lengthwise was used (LVL R). In one LVL slab, a fifth of the veneers were glued crosswise (LVL X). Laminated veneer lumber slabs are engineering wood products with several important performance characteristics, making them a sustainable and preferred solution in civil engineering. To ensure the safe operation of a building with LVL structural elements, it is important to know their dynamic properties. The basic dynamic characteristics of the slabs obtained from experimental tests made it possible to validate the numerical models of the slabs. The slab models were developed in the Abaqus program using the finite element method. The elastic and shear moduli of laminated veneer lumber used in the four slabs were identified through an optimization process in which the error between the analyzed frequencies from the laboratory tests and the numerical analyses was minimized. In the case of slabs that possess the same thickness and are composed of different LVL types, the elastic modulus of LVL R in the longitudinal direction was 1.16 times higher than the elastic modulus of LVL X in the same direction. However, the elastic moduli of LVL R in tangential and radial directions were lower than the elastic moduli of LVL X in the same directions. The above was the result of the fact that the 45 mm LVL X slab had 3 out of 15 veneers glued crosswise. In the case of slabs possessing different thicknesses but the same width and type, the elastic modulus of the thicker panel was 1.13 times higher than that of the thinner panel. After validating the models, the numerical analyses yielded results consistent with the experimental results. The numerical models of the LVL slabs will be used to develop numerical models of composite floors with LVL panels in future research. Such models will allow for the analysis of floor dynamic characteristics and user-generated vibrations, which is required when verifying the serviceability limit state.

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Section: Dynamic Tests Of Lvl Slabsmentioning

confidence: 99%

“…The modal properties determined in laboratory tests can be used for updating numerical models and for identifying the elastic properties of timber and engineering wood products [47][48][49].…”

Section: Dynamic Tests Of Lvl Slabsmentioning

confidence: 99%

Free Vibrations of Sustainable Laminated Veneer Lumber Slabs

Abramowicz,

Chybiński,

Polus

et al. 2023

Sustainability

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“…[5] deals with the effects of support conditions respectively plan aspect ratios on the natural frequencies and damping of the floor elements corresponding to the serviceability. By in-situ measurements but also in the laboratory, various research works have additionally examined the vibrational characteristics of the raw floor slab and furthermore differences between different floorings [4,[6][7][8]. The tests presented in the current paper also provide measurement data for the human-induced excitation as well as additional experimental results for different floorings and support conditions.…”

Section: Introduction 567mentioning

confidence: 99%

Active Mass Dampers for Timber Floors

Hillberger,

Furtmüller,

Dietsch

et al. 2023

World Conference on Timber Engineering (WCTE 2023)

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Extensive modeling of timber slabs with active vibration elements has shown that, compared to passive vibration dampers, a significantly better effect is achieved with a fraction of the required mass. In this respect, it is obvious to intensify research in the field of active vibration control. These active damping systems are intended to positively affect the vibration properties of slender slab structures in particular. Fundamental for this research is that the requirements of the Eurocodes are met and the weight of the active elements is kept low. In the present work, the vibration properties, in particular the vibration response of cross laminated timber are addressed. The dynamic parameters determined for a simply line supported system define the following tests which are carried out with actively controlled damping elements.The tests with the cross laminated timber panel suggest that counteracting at certain times and with predefined levels of intensity causes a considerable reduction of the acceleration values. Based on controlling the acceleration response, tests are performed on a complex timber construction. Different excitation, including the random and dynamic motion of people moving on the slab, increase the difficulty to solve this task for slab systems using common control systems. Therefore, the purpose of this research is to verify the reduction of floor vibrations and to demonstrate its effectiveness in experiments with human-induced excitation. The results show a significant reduction in vibration acceleration for different types of excitation and highlight the possibilities of active vibration control.

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