The effect of interlayer interaction on the vibration characteristics of vibration-damped composite floor slabs was investigated to analyze and discuss the vibration serviceability of floor slabs.The vibration characteristics of vibration-damped composite floor slabs were analyzed by spectral method,based on the three-dimensional laminated theory and tak-ing into account interlayer interaction.The vibration-damped composite floor slabs displacement variables were expanded using the first type of Chebyshev polynomials and double trigonometric grades.The free vibration equations of vibration-damped composite floor slabs were obtained through Hamilton's principle.The vibration characteristics of these floor slabs were calculated.Furthermore,the study analyzed the impact of floor slab parameters and interlayer interaction on vi-bration responses.The results indicate that the interaction between interlayers reduces each order dimensionless frequency of the floor slab when non-structural layers,such as decorative and vibration-damped layers,are considered.For composite floor slabs,the difference in elastic modulus and thickness enhances the impact of interlayer interaction.It is important to consider the decrease in the elastic modulus of the damping layer,as it results in a more significant reduction in the funda-mental frequency of the composite floor slab.Similarly,increasing the thickness of the damping layer leads to a more sig-nificant reduction in the fundamental frequency of the composite floor slab.Therefore,it is important to take these factors into account when designing vibration-damped composite floor slabs.
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