Theoretical calculation and test of airborne sound insulation for wooden building floor

Abstract

To meet objectives such as the sound insulation characteristics of timber structures and the comfort of residents, this study assessed an ordinary floor and three kinds of floating floors (Portuguese cork, graphite polystyrene sound insulation boards and expanded polypropylene plastic foam boards) in the same bedroom of a two-storey light wooden building. Adopting standard white noise and music noise excitation, structural design, theoretical checks and sound insulation tests of the floors were conducted. For the four floor structures, the sound insulation volume, sound pressure distribution characteristic spectrum of the building floor under different noise source environments, the frequency characteristics of the noise source, the multiple relationship of the sound insulation sound pressure level and the sound insulation mechanism were analysed. It was found that the sound pressure multiple of the space separating the upper and lower floors of the building was 8–18 times greater than that of the light wooden floor structure. The airborne sound insulation volume–frequency curves of the four floors, calculated by the transfer matrix method, were consistent with the actual measured values. The sound insulation effect was better in the low and middle frequencies.

A Review on Strengthening of Timber Beams Using Fiber Reinforced Polymers

“…The mechanical properties of timber and other biomass materials can be better utilized by testing and improvement [100][101][102][103][104][105], the strength of FRP is far greater than that of timber beams, the strength of a loosely attached FRP cannot be fully utilized. To address this challenge, prestressing was applied to FRP sheets to improve the utilization of FRP strength.…”

A Review of Basic Mechanical Behavior of Laminated Bamboo Lumber

“…With the improvement of living standards, the demand for environmentally friendly, lightweight, and safe structures has increased dramatically [1][2][3][4][5]. Bamboo as a sustainable alternative to traditional building materials, including wood, has started to gain attention [6][7][8][9][10][11][12][13][14][15] due to its short time to harvest [16,17], the variety of species, as well as the high yield, and the ability to reach a maximum height of 15-30 meters in 2-4 months, and the maximum strength in 3-8 years [18,19].…”