Authors

Abstract

Frequent greenhouse collapses under strong wind conditions highlight the limitations of existing structural design methods. Although most previous studies have focused on the stability and load-bearing capacity of greenhouse frames, the dynamic interaction among the greenhouse film, tensioning straps, and structural frame remains insufficiently investigated. This study proposes a novel flat-elliptical pipe plastic greenhouse and derives its mechanical equilibrium equations to analyze the stress behavior of the greenhouse film under wind loading. Using ABAQUS finite element software, an advanced contact model was developed to examine the wind-induced response of the greenhouse system. The results indicate that the structural frame plays a critical role in governing film deformation. In particular, the contact pressure and shear stress between the frame and the film are significantly higher than those between the film and the tensioning straps, underscoring the necessity of explicitly considering contact effects in greenhouse structural design.

Abstract in Chinese

强风荷载导致大棚出现倒塌损毁的案例时有发生，凸显了当前大棚结构设计方法的不足。大多数现有的研究都集中在骨架的稳定性及其承载能力上，但薄膜、薄膜张力线和骨架之间的耦合效应仍未得到充分探索。本研究以平椭圆管塑料大棚为对象，通过推导其力学平衡方程，明确棚膜在风致响应中的受力机制，利用ABAQUS有限元软件建立压膜线-棚膜-骨架接触模型，系统分析了其风致响应。研究结果强调了骨架在风荷载下棚膜变形中的重要作用，骨架与棚膜之间的接触压力和剪切应力远高于薄膜张紧线与薄膜之间。这些发现强调了在大棚结构设计中考虑接触效应的重要性。