Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Wind Fragility for Urban Street Tree in Korea

강풍 발생 시 국내 가로수의 취약성 분석

  • Sim, Viriyavudh (Department of Civil Engineering, Gangneung-Wonju National University) ;
  • Jung, WooYoung (Department of Civil Engineering, Gangneung-Wonju National University)
  • Received : 2019.09.23
  • Accepted : 2019.10.25
  • Published : 2019.11.30
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Abstract

In this paper, the analytical method to derive wind fragility for urban street tree in Korea was shown. Monte Carlo Simulation method was used to determine the probability of failure for urban street tree. This probability result was used to determine wind fragility parameters for four types of tree based on the study of street tree species in urban area in Daegu, Korea. Wind fragility for street tree was presented in terms of median capacity and standard deviation of the natural logarithm of the capacity. Results showed that the dominant factor affecting the probability of failure of tree under wind load was their diameter. Moreover, amongst the four types of tree chosen, the tree with height 7m and diameter 35cm had the lowest probability of failure under wind loading, whereas the tree with height 8m and diameter 30cm could resist the least wind loading. The median failure wind speed for urban street tree with height 7m were 43.8m/s and 50.6m/s for diameter 30cm and 35cm, respectively. Also, for tree with height 8m, their median failure wind speeds were 38.7m/s and 45.4m/s for tree with diameter 30cm and 35cm, respectively.

이 논문에서는 한국의 가로수에 대한 바람 취약성을 유도하는 분석 방법을 보여준다. 몬테 카를로 시뮬레이션 방법은 도시 가로수의 파괴 확률을 결정하는 데 사용되었다. 이 확률 결과는 대구 지역의 가로수를 기반으로 4 가지 유형에 대한 바람 취약성 매개 변수를 결정하는 데 사용되었으며, 이로 인해 풍하중에서 가로수 손상 확률에 영향을 미치는 주요 요인이 직경이라는 것을 나타낸다. 또한, 선택된 4 가지 유형 중에서 높이 7m, 직경 35cm의 가로수는 손상률이 제일 낮은 반면, 높이 8m, 직경 30cm의 가로수는 가장 낮은 풍하중에서 저항하였다. 높이 7m의 가로수의 평균 손상 풍속은 직경 30cm 및 35cm에 대해 각각 43.8m/s 및 50.6m/s로 나타났으며, 높이 8m의 가로수의 평균 손상 풍속은 직경 30cm 및 35cm에 대하여 각각 38.7m/s 및 45.4m/s로 나타났다.

Keywords

References

  1. American Society of Civil Engineers (ASCE). (2010). Minimum design loads for buildings and other structures. [DOI https://doi.org/10.1061/9780784412916]
  2. Aylor, D (1972). Noise reduction by vegetation and ground, The Journal of the Acoustical Society of America, 51(1B), pp. 197-205. [DOI https://doi.org/10.1121/1.1912830]
  3. Chiesura, A (2004). The role of urban parks for the sustainable city, Landscape and urban planning, 68(1), pp. 129-138. [DOI https://doi.org/10.1016/j.landurbplan.2003.08.003]
  4. Ellingwood, BR, Rosowsky, DV, Li, Y and Kim, JH (2004). Fragility assessment of light-frame wood construction subjected to wind and earthquake hazards, Journal of Structural Engineering, 130(12), pp. 1921-1930. [DOI https://doi.org/10.1061/(ASCE)0733-9445(2004)130:12(1921)]
  5. Ellingwood, BR and Tekie, PB (1999). Wind load statistics for probability-based structural design, Journal of Structural Engineering, 125(4), pp. 453-463. [DOI https://doi.org/10.1061/(ASCE)0733-9445(1999)125:4(453)]
  6. Ham, H, Lee, S and Kim, H (2009). Development of typhoon fragility for industrial buildings, Proceeding of the 7th Asia-Pacific Conference on Wind Engineering, Taipei, Taiwan, November 8-12, 2009.
  7. Im, D, Kim, W, Choi, SU and Kim, Y (2011). Investigation of critical breaking moment through field tree-pulling test, Journal of the Korean Society of Civil Engineers, 31(4B), pp. 323-332. [DOI https://doi.org/10.12652/Ksce.2011.31.4B.323]
  8. Lee, S, Ham, HJ and Kim, HJ (2013). Fragility assessment for cladding of industrial buildings subjected to extreme wind, Journal of Asian Architecture and Building Engineering, 12(1), pp. 65-72. [DOI https://doi.org/10.3130/jaabe.12.65]
  9. Lee, M, Hong, JH and Kim, KY (2017). Estimating damage costs from natural disasters in Korea, Natural Hazards Review, 18(4), pp. 04017016. [DOI https://doi.org/10.1061/(ASCE)NH.1527-69 96.0000259]
  10. Lee, KH and Rosowsky, DV (2005). Fragility assessment for roof sheathing failure in high wind regions, Engineering Structures, 27(6), pp. 857-868. [DOI https://doi.org/10.1016/j.engstruct.2004.12.017]
  11. Lee, KH and Rosowsky, DV (2006). Fragility curves for woodframe structures subjected to lateral wind loads, Wind and Structures, 9(3), pp. 217-230. [DOI https://doi.org/10.12989/was.2006.9.3.217]
  12. McPherson, EG (1994). Cooling urban heat islands with sustainable landscapes, The ecological city: preserving and restoring urban biodiversity, Rutherford H. Platt, Rowan A. Rowntree, Pamela C. Muick (eds.), University of Massachusetts Press, Amherst, Massachusetts, pp. 151-171.
  13. Neville, LR (1996). Urban watershed management: The role of vegetation, Ph.D. Dissertation, State University of New York, New York, USA.
  14. Nowak, DJ (1994). Air pollution removal by urban trees and shrubs in the United States, Urban forestry & urban greening, 4(3-4), pp. 115-123. [DOI https://doi.org/10.1016/j.ufug.2006.01.007]
  15. Nowak, DJ (2002). The effects of urban forests on the physical environment, Urban Forests and trees. COST Action E, 12, pp. 22-42.
  16. Porter, K (2015). Beginner's guide to fragility, vulnerability, and risk, University of Colorado Boulder, Colorado, USA. [DOI https://doi.org/10.1007/978-3-642-36197-5_256-1]
  17. Sagi, PV (2016). Foundation Effects of Trees Under Wind Loads, Ph.D. Dissertation, The University of Western Ontario, Ontario, Canada.
  18. Sim, V, Kim, S and Jung, WY (2018). Wind Fragility for Sign Structure in Korea with Chemical Anchor Connection, MATEC Web of Conferences, 186, pp. 02008. [DOI https://doi.org/10.1051/matecconf/201818602008]
  19. Typhoon Committee. (2015). Typhoon Committee Operational Manual 2015 (Report), World Meteorological Organization.
  20. Vickery, PJ, Skerlj, PF, Lin, J, Twisdale Jr, LA, Young, MA and Lavelle, FM (2006). HAZUS-MH hurricane model methodology. II: Damage and loss estimation, Natural Hazards Review, 7(2), pp. 94-103. [DOI https://doi.org/10.1061/(ASCE)1527-6988(2006)7:2(94)]
  21. Yoon, TK, Park, CW, Lee, SJ, Ko, S, Kim, KN, Son, Y, Lee, KH, Oh, S, Lee, WK and Son, YW (2013). Allometric equations for estimating the aboveground volume of five common urban street tree species in Daegu, Korea, Urban forestry & urban greening, 12(3), pp. 344-349. [DOI https://doi.org/10.1016/j.ufug.2013.03.006]