Wind and Structures

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Evaluation of stress distribution with wind speed in a greenhouse structure

  • Hur, Deog-jae (Research & Business Corporation Center, Institute for Advanced Engineering) ;
  • Noh, Jung-Hun (Research & Business Corporation Center, Institute for Advanced Engineering) ;
  • Lee, Hyun ju (Research & Business Corporation Center, Institute for Advanced Engineering) ;
  • Song, Hyoung woon (Plant Engineering Division, Institute for Advanced Engineering)
  • Received : 2017.10.11
  • Accepted : 2018.05.30
  • Published : 2018.11.25
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Abstract

In this paper, stress distribution for a structurally stable greenhouse is considered in the present paper with subsequent investigation into the detailed stress distribution contour with the variation of self-weight and wind pressure level designation method under wind velocity of less than 30 m/sec. For reliable analysis, wind pressure coefficients of a single greenhouse unit were modeled and compared with experiment with correlation coefficient greater than 0.99. Wind load level was designated twofold: direct mapping of fluid dynamic analysis and conversion of modeled results into wind pressure coefficients ($C_P$). Finally, design criteria of EN1991-1-4 and NEN3859 were applied in terms of their wind pressure coefficients for comparison. $C_P$ of CFD result was low in the most of the modeled area but was high only in the first roof wind facing and the last lee facing areas. Besides, structural analysis results were similar in terms of stress distribution as per EN and direct mapping while NEN revealed higher level of stress for the last roof area. The maximum stress levels are arranged in decreasing order of mapping, EN, and NEN, generating 8% error observed between the EN and mapping results under 30 m/sec of wind velocity. On the other hand, effect of dead weight on the stress distribution was investigated via variation of high stress position with wind velocity, confirming shift of such position from the center to the forward head wind direction. The sensitivity of stress for wind velocity was less than 0.8% and negligible at wind velocity greater than 20 m/sec, thus eliminating self-weight effect.

Keywords

Acknowledgement

Supported by : Ministry of Agriculture, Food and Rural Affairs

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