Sound insulation of wooden three-layered material, 2: Floor-impact sound level of wooden three-layered floors
2010
Nakamura, T., Kumamoto Univ. (Japan) | Yano, T. | Murakami, K. | Hasegawa, A. | Etoh, T. | Takahashi, Y. | Kitahara, R.
In the present study the floor impact sound insulations of three-layered floors composed of cedar timber and plywood was measured and evaluated in accordance with JIS A 1418-1, JIS A 1418-2, and JIS A 1419-2, and compared with that of conventionally constructed floors. The results were summarized as follows: (1) The light and heavy floor impact sound insulations of the three-layered floors was better than that of conventionally constructed floor; (2) The light floor impact sound insulation of the three-layered floors with rubber supporting the upper air layer was much better than of the others; (3) When the joist interval is changed from 433.5 mm to 289 mm, the heavy floor impact sound insulation was improved by the increase of the stiffness; (4) When the CFRP plate was bonded to the floor with the joist interval of 433.5 mm, the heavy floor impact sound insulation was improved. However, the CFRP plate had no effect in the case of the floor with the joist interval of 289 mm, because bonding the CFRP plate to the wooden floor was not enough to increase the stiffness.
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