Vibration reduction in cross-laminated timber panels using various lamination materials and integrated elastomer layers

Cross-laminated timber (CLT) is increasingly used for construction of multi-storey buildings. However, ensuring satisfactory vibro-acoustic performance, particularly in the low-frequency range (typically below 200 Hz), remains a significant challenge, often necessitating add-on solutions such as floating floors. In this study, the aim was to investigate how vibration levels for CLT panels can be reduced by using various lamination materials as well as integrated elastomer layers. Finite element (FE) models were developed, calibrated and validated based on experimental modal analysis of CLT panels with and without elastomer layers. Specifically, elastic moduli of spruce, birch and compressed spruce were calibrated to experimentally obtained eigenfrequencies and mode shapes. Moreover, calibrated FE models of selected panels were used to determine and calibrate a viscoelastic material model for the elastomer layer using frequency-dependent stiffnesses and damping. Using the material model for the numerical simulations, the deviations in accelerance root mean square values were less than 1 dB compared to the experimental data. Finally, it was shown that by using birch or compressed spruce instead of spruce the vibration response could be reduced by 30% and 50%, respectively, for a realistic floor panel size. By integrating a 12 mm elastomer layer into the panels, the vibration response could be reduced by an additional 40%, compared to a panel without an elastomer layer. • Experimental modal analysis and numerical dynamic analysis of CLT panels. • Calibration of elastic moduli for spruce, birch and compressed spruce. • Calibration of frequency-dependent material properties of elastomer layer. • Up to 50% reduction of vibration response by changing lamination material. • 40% reduction of vibration response by integrating an elastomer layer.