Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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A Study on the Structural Safety Analysis for Vinyl House at Snow Load

비닐하우스의 적설하중 구조안전성 검토에 관한 연구

  • Paik, Shinwon (Department of Civil, Safety and Environmental Engineering, Hankyong National University)
  • 백신원 (한경대학교 토목안전환경공학과)
  • Received : 2018.12.27
  • Accepted : 2019.02.20
  • Published : 2019.04.30
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Abstract

Vinyl house consists of main rafter, lateral member, clamps and polyethylene film. Many vinyl houses are used in the countryside to grow vegetables. These vinyl houses have occasionally been collapsed due to heavy snowfall in winter. Many farmers get a lot of economical damages, if vinyl houses are collapsed. So it is most important to built a safe vinyl house that can withstand heavy snowfall. In this study, a structural analysis was performed on three types of vinyl houses(07-single-01, 10-single-04, 12-single-01). In addition, the structural analysis of the three types of vinyl houses provided axial forces, flexural moment, and combined stress. For these three types of vinyl houses, structural safety was reviewed by obtaining the combined stress ratio by the strength design method. This structural review showed that the specifications for the vinyl house proposed in the design are not safe. Especially, the result of increasing the design snow load by 15 percent and 30 percent showed that the vinyl house structure constructed as a standard for vinyl house was a more dangerous structure. Therefore, it is necessary to revise regulations such as increasing the thickness of rafters or widening the gap in order to make vinyl houses structurally safe for heavy snowfall in the future, and to devise diverse methods to make vinyl houses that are structurally safe.

Keywords

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Fig. 1. Basic greenhouse frame.

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Fig. 2. Unit snow load according to the snow depth.

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Fig. 3. Balanced snow load distribution of vinyl house (07-Single-1, Design snow load=100%).

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Fig. 4. Unbalanced snow load distribution of vinyl house (07-Single-1, Design snow load=100%).

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Fig. 5. Node numbers of vinyl house.

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Fig. 6. Axial force distribution according to the balanced design snow load(07-Single-1).

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Fig. 7. Moment distribution according to the balanced design snow load(07-Single-1).

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Fig. 8. Axial force distribution according to the unbalanced design snow load(07-Single-1).

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Fig. 9. Moment distribution according to the unbalanced design snow load(07-Single-1).

Table 1. Standard greenhouse

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Table 2. Ground snow load(( Sg, N/m2 )

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Table 3. Roof slope coefficient

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Table 4. Uniform snow load(ws, N/m)

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Table 5. Structural analysis results

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Table 6. Combined strength ratio

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References

  1. H. J. Jung, S. H. Yang and T. H. Lee, "A Study on the Improvement of Greenhouse Frame to Bear the Heavy Snow", Journal of the Korea Academia-Industrial Cooperation Society, Vol. 16, No. 3, pp. 2242-2248, 2015. https://doi.org/10.5762/KAIS.2015.16.3.2242
  2. K. C. Ro, "An Evaluation of the Structural Stability of a Clip Type Prefabricated Greenhouse under Strong Wind and Heavy Snow Conditions", Journal of the Korea Academia-Industrial Cooperation Society, Vol. 15, No. 6, pp. 3423-3428, 2014. https://doi.org/10.5762/KAIS.2014.15.6.3423
  3. D. J. Jung and C. Teng, "Effect of Wire Bracing to Snow Load Acting on Vinyl House Frame", Journal of the Korea Rural Building Institute, Vol. 12, No. 3, pp. 27-34, 2010.
  4. M. H. Oh, G. J. Shin and G. S. Joo, "Research Trend of Vinyl House in Snowfall", Journal of Disaster Prevention, Vol. 49, pp. 114-122, 2012.
  5. S. W. Paik and H. J. Kim, "A Study on the Strength Characteristics of Vinyl House Pipe Filled with Mortar", Journal of the Korean Society of Agricultural Engineers, Vol. 57, pp. 13-17, 2015. https://doi.org/10.5389/KSAE.2015.57.5.013
  6. Ministry of Land, Infrastructure and Transport, "Architectural Design Specification", 2016.