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Wind and Structures Volume 27, Number 5, November 2018, pages 347-356 DOI: http://dx.doi.org/10.12989/was.2018.27.5.347 |
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Evaluation of stress distribution with wind speed in a greenhouse structure |
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Deog-jae Hur, Jung-Hun Noh, Hyun ju Lee and Hyoung woon Song
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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 (CP). Finally, design criteria of EN1991-1-4 and NEN3859 were applied in terms of their wind pressure coefficients for comparison. CP 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. | ||
| Key Words | ||
| computational fluid dynamics (CFD); stress distribution; venlo-type greenhouse; wind load; wind pipe; Wind pressure coefficients (CP) | ||
| Address | ||
| Deog-jae Hur, Jung-Hun Noh and Hyun ju Lee: Research & Business Corporation Center, Institute for Advanced Engineering, 175-28,Goan-ro, 51 beon-gil, Beagam-myeon, Cheoin-gu,Yongin-si, Gyeonggi-do, Republic of Korea Hyoung woon Song: Plant Engineering Division, Institute for Advanced Engineering, 175-28,Goan-ro, 51 beon-gil, Beagam-myeon, Cheoin-gu,Yongin-si, Gyeonggi-do, Republic of Korea | ||