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Failure conditions for stand-alone cold-frame greenhouse under snow loads

  • Junsuk Kang
  • Jeongbae Jeon
  • Seongsoo Yoon
  • Won ChoiEmail author
Article

Abstract

In South Korea, even snowfalls under the design snow loads are frequently known to cause significant deformations or failures of stand-alone cold-frame greenhouses. However, the possible causes of such events are not reflected in the structural design criteria currently used. To estimate the deformations related to structural failures, this study set up possible scenarios to be able to make the structural failures and examined the reasons through scaled-down experiments and nonlinear structural analyses. Hinge boundary conditions of supports and non-uniform snow loads occurred by the repetitive freeze–thaw cycles of the soils surrounding the supports without concrete foundations, and differences between internal and ambient temperatures, respectively, were considered. Two-dimensional scaled-down models of the greenhouses were constructed based on the similarity law. The experimental results were compared with those from nonlinear structural analyses of linear elastic–plastic models. For fixed boundary conditions at both ends and uniform snow loads, the relative errors of displacements between the experimentally obtained values and the results of the finite element analyses were within 6.10%. The results revealed that structural failures occurred in all cases with hinge boundary conditions for the supports at both ends for both uniform and non-uniform snow loads, but the greatest deformation behavior of the structure was observed with a hinge–hinge boundary condition and non-uniform snow loads where the horizontal displacement was similar to the vertical displacement. The temporary installations of diagonal braces in the greenhouses when heavy snowfalls are forecasted are therefore recommended to reduce the side sway.

Keywords

Stand-alone cold-frame greenhouse Failure condition Scaled-down experiment Nonlinear structural analysis 3D printer 

Notes

Acknowledgements

This study was supported by the Korean Meteorological Institute, Korea Meteorological Administration (grant number: KMI2018-04310).

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Copyright information

© The International Society of Paddy and Water Environment Engineering 2019

Authors and Affiliations

  • Junsuk Kang
    • 1
  • Jeongbae Jeon
    • 2
  • Seongsoo Yoon
    • 3
  • Won Choi
    • 1
    Email author
  1. 1.Department of Landscape Architecture and Rural Systems Engineering, College of Agriculture and Life SciencesSeoul National UniversitySeoulSouth Korea
  2. 2.Korea Land and Geospatial Informatix CorporationSpatial Information Research InstituteJeonju-siSouth Korea
  3. 3.Department of Agricultural and Rural Engineering, College of Agriculture, Life and Environments SciencesChungbuk National UniversityCheongju-siSouth Korea

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