The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Influence of roadside buildings on the noise in the backside blocks in city area

도시내 가로변 빌딩이 도로 이면지역의 소음에 미치는 영향

  • 김용성 (충북대학교 건축공학과) ;
  • 한찬훈 (충북대학교 건축공학과)
  • Received : 2019.03.19
  • Accepted : 2019.05.15
  • Published : 2019.05.31
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Abstract

The old residences and shops in the backside blocks are affected by the traffic noises from the main road. The noise of the backside roads is affected by the following factors such as the height of the roadside buildings, the distance between the road and the backside streets, distance among adjacent roadside buildings, and the difference of the adjacent building heights. The both noise levels on the road and the backside street were measured simultaneously in 15 urban blocks of a city which can be categorized into two types of roadside building plans ; 1) one single building along the street, 2) buildings arranged on one axis beside the road. As the results, there is no significant noise reduction due to the width of the buildings in general. However, in the cases of buildings arranged on one axis beside the road, it was found that the average noise reduction was 12 dB(A) on the basis of the building height of 4 m. Also, it was analysed that for each 4 m increase in the building height, noise reduction occurred by 2 dB(A) beyond building height of 4 m. In general, it was proved that the noise of the back streets is mainly affected by the lowest height of the roadside buildings. It was found that noise is increased by 1 dB(A) for each 4 m increase of the height difference between adjacent buildings. Also, It was revealed that for each 0.5 m increase in the distance between roadside building, noise reduction decreased by 1 dB(A).

가로변 이면지역에 위치한 노후된 공동주택은 주도로의 교통소음의 피해를 받는다. 이면지역의 소음은 가로면 건물의 높이와 주도로와의 이격거리, 그리고 도로변 건물간의 이격거리 및 도로변 건물간의 높이차이에 의하여 영향을 받는다. 본 연구는 한 도시 내의 15개의 블록을 선정하여 가로변 건물배치형태를 1)블록에 단일건물이 배치된형태, 2)블록에 다수의 건물이 하나의 축으로 연속하여 배치된 형태로 분류하였으며, 가로변과 이면지역에서 도로교통소음을 동시에 측정하여 가로변의 건물 배치형식에 따른 이면지역소음의 상관성을 분석하였다. 분석결과, 이면지역으로 전달된 도로교통소음은 가로변에 배치된 건물의 높이, 건물과 건물간의 이격된 거리, 인접한 건물의 높이차에 영향을 받으며 건물의 너비에 의한 소음도의 감소는 나타나지 않았다. 가로변에 위치한 건물의 높이가 4 m(단층)인 경우 이면지역의 소음도는 12 dB(A)감소하였으며 높이가 4 m 증가할 때마다 2 dB(A)씩 감소하는 것으로 나타났다. 또한 인접한 두 건물의 높이차가 4 m 증가할 때마다 이면지역의 소음도는 1 dB(A)씩 증가하였으며, 인접한 두 건물의 이격된 거리가 0.5 m 증가할 때마다 이면지역의 소음도는 1 dB(A)씩 증가하는 것으로 나타났다.

Keywords

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Fig. 1. Layout of roadside buildings.

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Fig. 2. Layout of roadside buildings in target areas.

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Fig. 3. Measured noise level at the roadside and backside area and the reduced noise level.

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Fig. 4. Location of noise measurement positions.

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Fig. 5. Reduced noise levels by distance from sidewalls.

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Fig. 6. Reduced noise levels sepending on the height of the buildings.

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Fig. 7. Roadside building dimensions affecting the noise level of the backside area.

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Fig. 8. Location of noise measurement positions and the division of backside areas (X and Y).

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Fig. 9. Reduced noise levels at the backside area (X) by the building height (h).

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Fig. 10. Reduced noise levels at the backside area (Y), when the adjacent buildings have same height.

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Fig. 11. Reduced noise levels at the backside area (Y) depending on the separation distance (d).

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Fig. 12. Reduced noise levels at the Y region by the height difference (Δh) of the adjacent buildings, when the lower building is 4 m high with the separation distance of 1.5 m.

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Fig. 13. Layout of roadside buildings in target blocks P & Q.

Table 1. Road width and traffic volume in the 15 target urban blocks.

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Table 2. Measured average noise levels of the roadside and backside area. dB(A).

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Table 3. Reduced noise levels in the backside area (X) by the building height (h).

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Table 4. Difference of reduced noise levels (D) at the backside area X and Y by two factors; separation distance(d) and the height (h) of adjacent buildings [dB(A)].

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Table 5. Reduced noise levels at the backside area (Y) depending on the height difference (Δh) of the adjacent two buildings.

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Table 6. Road traffic conditions of P and Q blocks.

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Table 7. Building height and separation distance of the consecutive buildings in P & Q blocks.

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Table 8. Comparison of the reduced noise levels at the X region of P & Q blocks both predicted (H) and measured values [dB(A)].

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Table 9. Comparison of the reduced noise levels at the Y region of P & Q blocks both predicted (RN) and measured values [dB(A)].

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