Studies On Design Methods For Sound Insulation Of Wood Structure Walls And Vibration Performance Of Wood Structure Floors

Wood frame buildings have a long history in China. Due to many reasons there was no more development. Recently Foreign modern wood frame buildings come to China and people pay great attention. By special performances modern wood frame construction will have a great future, however undeniably there exist problems of low sound insulation of walls and poor vibration of floors in some buildings. Sometimes these situations are not related to building technology and materials while caused by design codes and methods. The role of the paper is to improve these performances.Sound insulation of wood structure walls is one of important properties. Based on the SEA method, the expression of the sound insulation of a single panel wall was given and the calculation method of the sound insulation of a double panel wall was obtained. By analyzing the influence of sound bridge and absorption layer on the sound insulation of a wall, the calculation expression of a double panel wall was revised and the formula of the sound insulation of a wood structure wall was put forward.The comparison between measured values and calculated values proved the serviceability of the calculation expression. The difference between measured weighted sound insulation and the calculation weighted sound insulation was less than 3dB. The parameters in the calculation expression are easy to reach by measurement, handbook or simple calculation. According to the practical situation the forecast formula of an assembled wall with doors or windows was given.In laboratory measurement, it was found that factors influencing the sound insulation of a wood structure wall were the surface density of wall panels, the size and the space of wood studs, the density and the thickness of sound absorption materials. The layout of wall panels is considered in the design and construction of wood structure walls. The space between wood studs has an obvious influence on the resonance frequency. In the calculation of the resonance frequency the surface density and the air thickness of wall panels is not only considered, the space between wood studs is also considered. Under the consideration of the structure safety,...