|Title:||New building design for reduction of traffic noise impact|
|Subject:||Hong Kong Polytechnic University -- Dissertations|
Buildings -- Environmental engineering
Department of Civil and Structural Engineering
|Pages:||viii, 60,  leaves : col. ill. ; 30 cm|
|Abstract:||Road traffic noise is one of the major environmental issues in Hong Kong. Roadside bafflers and enclosures are the commonest and the most direct mitigation measure to alleviate the traffic noise impacts on the sensitive receivers. However, due to site constraint, barriers or enclosures are not always practicable mitigation measures. In this study, the effectiveness on traffic noise attenuation of different forms of architectural building features including vertical fins, horizontal fins, open balcony and closed balcony, were investigated. The side effects arising from the installation of architectural features such as light intensity, natural ventilation, visual impacts and maintenance were also discussed. With the assumption of non-reflective sound from the fins, rear walls of balconies and ceilings, closed balcony was expected to be the most effective noise screening structure with a maximum of 12.5 dB(A) attenuation on the sensitive facade. Results implied that the noise attenuation on the facades with vertical fins were relatively constant at different floors. The noise reduction on the facades with horizontal fins and balcony was generally higher at higher floors, but no obvious noise reduction was expected at lower floor facades. This is mainly attributed to the limited path difference as a result of the geometrical configuration at lower floor levels. The noise protection performance of the closed balcony was better than that of open balcony as lateral noise screening can play an essential role in closed balcony. A natural lighting assessment on the assessed facades with architectural features has also been addressed. Results indicated that vertical fins and horizontal fins would reduce the natural lighting level onto the facade. The lighting level at the facade was found to rise when balcony with enhanced window size was built. It is hopeful that the results from this study would provide some baseline information to the architect who wishes to use these architectural features as noise mitigation measures in Hong Kong.|
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