Document Type : Original Article
Authors
1 Researcher
2 Agricultural engineering research institute
Abstract
For controlling biotic/abiotic stresses in protected environment, using shade/net house is effective. Unlike greenhouse, shade/net house is designed for non-extreme loads. Method of applying loads as key point should be considered in design of structure. Design of columns is controversial issue considering moments caused by wind. These bending&twisting moments in columns are created dueto imbalance of wind. Columns used in shade/net structures have direct effect on its strength, under different loads. Stress analysis of columns with rectangular section,C&U channels are considered for comparison. Analysis were down bySolidWorks. This stress analysis was performed for mentioned columns that are placed next to each other in double form. Analysis of single columns showed that in front loading, column with U section has more strength than other columns&it had less deflection. In lateral loading, less stress was calculated for U section. In terms of torsional load, column with rectangular section performed better&had smaller deviation than U&C channel columns. It can be concluded that in mentioned single columns, performance of U section is more acceptable. Results of loading&analysis of three types of double columns showed that strength of U profile is higher than that of rectangular tube&Cchannel. Deflection created was less than other two types of columns. In lateral loading, stress analysis showed that U column has more strength&has less deflection. In torsional loading, double rectangular column had more strength&less deflection than other two sections. Based on stress analysis results,it was clarified that double U section has more strength&successfully can be used in shade/net houses.
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