Authors

Abstract

This study addresses the issues of overly simplified modeling and the neglect of fluctuating wind effects in the current finite element analysis (FEA) of wind-induced response in plastic greenhouses. By deriving the dynamic equations of motion for the greenhouse under wind loading, and simulating fluctuating wind using the Davenport wind speed spectrum for loading the finite element model, this work employs ABAQUS finite element software to establish both binding and contact models for a flat-elliptical pipe greenhouse(FEPG). Wind-induced vibration responses for both models are analyzed, leading to the following conclusions: The peak stress on the film in the contact model is 1.18 times that of the binding model, with peak displacement approximately 2.93 times greater. The peak stress in the skeleton of the contact model is 1.48 times that of the binding model, and the peak displacements in the x, y and z directions are approximately 1.25, 1.13 and 1.38 times greater, respectively. The peak stress on the film-tensioning line in the contact model is 1.24 times higher, and the peak displacements in the x, y and z directions are approximately 1.16, 1.21 and 1.51 times greater, respectively, compared to the binding model. The results highlight the importance of considering fluctuating wind and the interactions between structural components in the analysis of wind-induced response in plastic greenhouses, thereby contributing to the further refinement of the theoretical framework for the wind response of flat-elliptical pipe greenhouses.

Abstract in Chinese

本研究针对目前塑料大棚风致响应有限元分析中存在的建模过于简化且未考虑脉动风影响的问题，通过推导大棚在风荷载作用下的动力学方程；基于Davenport风速谱模拟脉动风用于有限元模型的加载，采用ABAQUS有限元软件建立平椭圆管塑料大棚绑定模型和接触模型，通过对两种模型进行风振响应分析，得出结论：接触模型的棚膜峰值应力是绑定模型的1.18倍，峰值位移约为约束模型的2.93倍。接触模型的骨架峰值应力为绑定模型的1.48倍，x、y、z方向的峰值位移分别为约束模型的1.25倍、1.13倍和1.38倍。接触模型的压膜线峰值应力为绑定模型的1.24倍，x、y、z方向的峰值位移分别为约束模型的1.16倍、1.21倍和1.51倍。研究结果强调了塑料大棚风致响应分析中考虑脉动风及构件之间相互作用的重要性，进一步完善平椭圆管塑料大棚在风致响应理论体系。