| 요약2 |
In this study, a new method was proposed to set the area of a living room based on the vibration behavior of the floor slab. The area of a living room studied in this study was named as the “effective plate” which was referred to the plate theory. To investigate the influence of the effective plate on floor impact noise, a modal test was conducted, and the floor impact noise was measured in a mock-up structure with two different living room sizes with non-floating slabs. As a result, it was found that the similar vibration responses and floor impact noises were obtained for the different living room sizes. This was because although there was about 34% difference in floor area of the two living rooms, the effective plates of those cases were same as 40m2. In the high frequency range with sufficient mode density, similar vibration responses were obtained because the effective plates were similar in size, resulting in similar floor impact noises. In contrast, however, for the frequency bands below 100Hz with low mode density, significant differences in the vibration responses were observed due to the shape of the plate and location of the load-bearing wall. Consequently, it was determined that the living room shape and boundary condition, such as position of load-bearing wall, were the main influencing factors for floor impact noise in the low frequency range, whereas the size of the plate was the main influencing factor in the high frequency range. This means that it is necessary to consider the frequency band in the design of a floating floor to effectively reduce the floor impact noise. |