Effect of Buildings around Highways on the Efficiency of T-Shaped Parallel Acoustic Barriers: A Theoretical Study

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KARAMI ESMAEIL; MONAZZAM MOHAMMAD REZA; Azrah Keykaous; MOHAMMADIAN MEHDI; GOODARZI ZAHRA

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Journal Paper

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Journal: Journal of Health and Safety at Work Year:2022 | Volume:12 | Issue:- Page(s): 141-159

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Title

Effect of Buildings around Highways on the Efficiency of T-Shaped Parallel Acoustic Barriers: A Theoretical Study

Author(s)

Keywords

Parallel noise barriers

Boundary Element Method (BEM)

2D simulation

T-shaped barriers

traffic noise reduction

Abstract

Introduction: Over recent years, various programs have been conducted to reduce noise, indicating the increasing concerns of society over noise pollution. This study has been performed to enhance the performance of parallel barriers on two sides of a highway considering the surrounding buildings. Material and Methods: The 2D boundary element simulation method was employed to predict the noise reduction in barriers. Regarding the effect of buildings and water canals, various kinds of models were investigated to compare the effectiveness of different boundary barriers in real conditions from a listener’, s perspective. Results: The use of a single YA model could improve the performance of parallel barriers by 3. 5 dB compared to that of a TS model. Moreover, by using a pair of barriers, no significant change was observed in the performance of the second barrier. However, by using parallel barriers along the surrounding buildings, the TD model improved the efficiency by 3 dB compared to the TS model. The rise in the frequency resulted in remarkable adverse effects on the barrier performance, such that the surrounding buildings at a distance of 8 m had a negative effect on the performance of the parallel barriers by almost 8. 34 dB. Conclusion: In general, by ignoring the buildings, the use of a pair of TZ barriers showed a higher performance. Meanwhile, by considering the buildings in the design model, the TD model was found to be optimum. Therefore, it can be concluded that choosing an ideal barrier only based on the noise behind it cannot indicate its behavioral and acoustic characteristics in a real environment.

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APA: Copy

KARAMI, ESMAEIL, MONAZZAM, MOHAMMAD REZA, Azrah, Keykaous, MOHAMMADIAN, MEHDI, & GOODARZI, ZAHRA. (2022). Effect of Buildings around Highways on the Efficiency of T-Shaped Parallel Acoustic Barriers: A Theoretical Study. JOURNAL OF HEALTH AND SAFETY AT WORK, 12(1 ), 141-159. SID. https://sid.ir/paper/1072601/en

Vancouver: Copy

KARAMI ESMAEIL, MONAZZAM MOHAMMAD REZA, Azrah Keykaous, MOHAMMADIAN MEHDI, GOODARZI ZAHRA. Effect of Buildings around Highways on the Efficiency of T-Shaped Parallel Acoustic Barriers: A Theoretical Study. JOURNAL OF HEALTH AND SAFETY AT WORK[Internet]. 2022;12(1 ):141-159. Available from: https://sid.ir/paper/1072601/en

IEEE: Copy

ESMAEIL KARAMI, MOHAMMAD REZA MONAZZAM, Keykaous Azrah, MEHDI MOHAMMADIAN, and ZAHRA GOODARZI, “Effect of Buildings around Highways on the Efficiency of T-Shaped Parallel Acoustic Barriers: A Theoretical Study,” JOURNAL OF HEALTH AND SAFETY AT WORK, vol. 12, no. 1 , pp. 141–159, 2022, [Online]. Available: https://sid.ir/paper/1072601/en

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