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首页> 外文期刊>農業施設: Journal of the Society of Agricultural Structures, Japan >Reinforcement for Pipe-Framed Greenhouse under Snow Load and Design Optimization Considering Steel Mass
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Reinforcement for Pipe-Framed Greenhouse under Snow Load and Design Optimization Considering Steel Mass

机译：雪荷载下管棚温室的加固及考虑钢质量的设计优化

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摘要

To investigate the low-cost reasonable design of a pipe-framed greenhouse (pipe house) under snow load, seven numerical finite element models of simple pipe houses were analyzed by stress analysis and buckling analysis. These determined the optimum position of bracing for pipe houses. The influence of the width and ridge height of the structure and the section modulus of the arch pipes on the upper limit of the allowable snow load was also obtained. Moreover, the relationship between a reasonable pipe house design and the arch pipe used for the structure was investigated. For the structures modified by the addition of two tension braces at points between 63% to 70% of the ridge height, the allowable snow load was significantly increased. The influence of addition of braces was remarkable for wider spans. There was little influence from the difference of the ridge height of the pipe house on the maximum allowable snow load for the heights considered using stress analysis. However, the maximum allowable snow load obtained by the buckling analysis decreased 54% as the ridge height increased so a buckling analysis is important. Considering the change of the support condition due to softening of the ground, increasing the size of the pipe section increases the allowable pipe spacing and reduces the total steel mass and shading of the structure. For a typical size pipe house, by replacing arch pipes of 19.1 mm diameter with 1.1 mm thickness by pipes of 42.7 mm diameter with 2.0 mm thickness, steel massand shading rate decreased by 58% and 77% respectively.
机译：为了研究雪荷载下管式温室（管房）的低成本合理设计，通过应力分析和屈曲分析，分析了七个简单管房的数值有限元模型。这些决定了用于管箱的最佳支撑位置。还获得了结构的宽度和脊高以及拱管的截面模量对允许雪荷载上限的影响。此外，研究了合理的管屋设计与用于结构的拱形管之间的关系。对于通过在山脊高度的63％到70％之间的位置添加两个抗拉支架而修改的结构，允许的雪荷载显着增加。大括号的添加对大跨度的影响是显着的。对于使用应力分析考虑的高度，管屋脊高的差异对最大允许雪荷载的影响很小。但是，随着脊高的增加，屈曲分析获得的最大允许雪荷载降低了54％，因此屈曲分析很重要。考虑到由于地面软化而引起的支撑条件的变化，增加管段的尺寸会增加允许的管距，并减少钢的总质量和结构的阴影。对于典型尺寸的管屋，通过将直径为19.1毫米，直径为1.1毫米的拱形管替换为直径为22.7毫米，厚度为2.0毫米的管，钢的质量和遮光率分别降低了58％和77％。

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