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Structural Safely Analysis of a Modified 1-2W Type Greenhouse Enhanced for Culturing Paprika  

Suh, Won-Myung (Dept. of Agricultural Eng., Gyeongsang National Univ.(Institute of Agriculture and Life Science, GNU))
Choi, Man-Kwon (Graduate school, Gyeongsang National Univ.)
Bae, Yong-Han (Graduate school, Gyeongsang National Univ.)
Lee, Jong-Won (Dept. of Agricultural civil Eng., Kyungpook National Univ.)
Yoon, Yong-Cheol (Dept. of Agricultural Eng., Gyeongsang National Univ.(Institute of Agriculture and Life Science, GNU))
Publication Information
Journal of Bio-Environment Control / v.17, no.3, 2008 , pp. 197-203 More about this Journal
Abstract
This study was performed to check the structural safety of modified 1-2W Greenhouses to be utilized fur growing Paprika. This type of greenhouse was derived from being remodeled by enhancing the column height of conventional 1-2W type greenhouses. According to the results of structural analysis performed by SAP-2000, there was not significant change in critical snow depth in spite of increasing the column height of 1.2 m by welding. But the critical wind velocities were shown to be $26.0\sim4l.0m/s$, which were $3\sim18%$ lower wind velocities compared with those critical velocities estimated for typical type of 1-2W greenhouse. Under the wind loads, those maximum section forces such as shear force, axial force, and bending moment, together with the deformed frame shape of strained greenhouse, were almost similar in both typical type and modified type. Maximum bending moment of column was found at eave's height of column on windward side. Under the snow loads, those maximum section forces such as shear farce, axial force, and bending moment, together with the deformed frame shape of strained greenhouse, were almost similar in both typical type and modified type. Maximum section forces except axial force was found at eave's height of column. Maximum axial force was found at inner column. Soil bearing capacity together with the total foundation resistance against wind upheaval was found to be consistently safe enough to resist to both wind load and snow load.
Keywords
buckling; column of 1-2W type greenhouse; snow depth; structural analysis; wind velocity;
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