The floor impact sound is a structure-borne sound that is propagated not only to the apartment directly below but also to various other locations. This study identifies how much floor impact sound, which is perceived as a problem for the whole apartment building rather than a problem for just the upper and lower floors, is propagated to surrounding apartments. Further, this study derives various variables for the cause of noise occurring in the apartment building. The measurement results indicate that most of the energy (38–54%) is propagated to the lower floor, which is an apartment directly underneath, for the noise produced when the floor slab is excited. Furthermore, it is found that the noise is propagated simultaneously to the apartments on the upper floor, as well as to the left and right sides.
The bubble deck slab has been applied to various buildings due to many advantages including the slab load alleviation and structural stability. The bubble deck slab should not only ensure structural stability but also satisfy the performance standards of floor impact sound required legally to be applied to apartments. This study investigated the characteristics of reduction in vibration and floor impact sound in apartments where the bubble deck slab was applied. The measurement results of vibration characteristics showed that the bubble deck slab had a similar natural frequency with that of the solid slab from a frequency (each of 16.7 Hz and 11.1 Hz) where the first mode was formed but the vibration level of the bubble deck slab at the low frequency band (80 Hz or lower), which was affected by the heavy-weight impact sound, was relatively smaller than that of the solid slab. The bubble deck slab showed a comparable or better performance in the insulation of the floor impact sound compared to that of the solid slab.
There are a lot of different types of noise from construction site and it depends on construction stage, equipment type and number of operating equipments. The problem is that the almost noise from construction site is high level and some kinds of noise levels are over 100 dB. In addition, if construction site is located in downtown, there are a few options to reduce noise level. Therefore several site mitigation plans were developed to reduce different types of construction noises such as breaker work, gang form and asphalt saw. They were applied in site and evaluated noise reduction performance. The test result of site insertion loss was between 4~8 dB depends on the equipment and type of work.
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