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Failure conditions for stand-alone cold-frame greenhouse under snow loads

机译：滑雪负荷下独立冷框温室的故障条件

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In South Korea, even snowfalls under the design snow loads are frequently known to cause significant deformations or failures of stand-alone cold-frame greenhouses. However, the possible causes of such events are not reflected in the structural design criteria currently used. To estimate the deformations related to structural failures, this study set up possible scenarios to be able to make the structural failures and examined the reasons through scaled-down experiments and nonlinear structural analyses. Hinge boundary conditions of supports and non-uniform snow loads occurred by the repetitive freeze-thaw cycles of the soils surrounding the supports without concrete foundations, and differences between internal and ambient temperatures, respectively, were considered. Two-dimensional scaled-down models of the greenhouses were constructed based on the similarity law. The experimental results were compared with those from nonlinear structural analyses of linear elastic-plastic models. For fixed boundary conditions at both ends and uniform snow loads, the relative errors of displacements between the experimentally obtained values and the results of the finite element analyses were within 6.10%. The results revealed that structural failures occurred in all cases with hinge boundary conditions for the supports at both ends for both uniform and non-uniform snow loads, but the greatest deformation behavior of the structure was observed with a hinge-hinge boundary condition and non-uniform snow loads where the horizontal displacement was similar to the vertical displacement. The temporary installations of diagonal braces in the greenhouses when heavy snowfalls are forecasted are therefore recommended to reduce the side sway.
机译：在韩国，甚至在设计雪载下的降雪甚至被众所周知，甚至是甚至降雪甚至常常已知造成独立冷框温室的显着变形或故障。然而，这种事件的可能原因没有反映在目前使用的结构设计标准中。为了估算与结构故障相关的变形，本研究设定了能够通过缩小实验和非线性结构分析来制定结构故障并检查原因的可能场景。铰链边界条件的支撑和非均匀雪荷载是由围绕围绕的土壤的重复冻融循环发生，无需混凝土基础，分别考虑内部和环境温度之间的差异。基于相似性法，构建了温室的二维缩小模型。将实验结果与来自线性弹性塑料模型的非线性结构分析的实验结果进行了比较。对于两端的固定边界条件和均匀的雪载，实验所获得的值与有限元分析结果之间的位移相对误差在6.10％以内。结果表明，在均匀和非均匀的雪地载荷的两端支撑件的铰链边界条件的所有情况发生的结构故障，但是用铰链铰链边界条件和非 - 水平位移与垂直位移相似的均匀雪地载荷。因此，建议预测大雪的温室中对角线支架的临时安装以减少侧摇摆。

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