Authors

Abstract

This study investigates the wind resistance performance of a novel flat-elliptical pipe greenhouse by developing a finite element model of the greenhouse frame using ABAQUS software. Based on the Davenport fluctuating wind speed spectrum and the Shiotani correlation coefficient, a MATLAB program was developed using an autoregressive (AR) model within a linear filtering method to simulate fluctuating wind speed time-history curves. Both static and full dynamic wind loads were applied to the model to evaluate the wind resistance performance of greenhouse frames with 5 arches and 50 arches. The results indicate that under static wind loading, the stresses in the frames did not exceed the elastic limit, and the deformations remained within the allowable range. However, under full dynamic wind loading, the stresses in the frames exceeded the elastic limit and entered the plastic stage. Although the lateral displacement in the plastic stage remained within permissible limits, the overall structure failed to meet the safety requirements of the greenhouse.

Abstract in Chinese

本研究针对新型平椭圆管塑料大棚，利用ABAQUS有限元软件建立了大棚骨架模型。基于Davenport脉动风速谱，选择Shiotani相关系数，采用线性滤波法中的AR法（自回归模型）编写MATLAB程序对脉动风速时程曲线进行了模拟。分别对模型施加静力风荷载和全动力风荷载，分析得到五榀和五十榀平椭圆管骨架塑料大棚抗风性能，分析结果表明：在静力风荷载作用下，大棚及骨架应力均未超过弹性极限，变形均在容许值范围内；在全动力风荷载作用下，大棚及骨架应力超过弹性极限，进入塑性阶段，但塑性阶段侧移未超过容许值，不满足大棚结构安全性要求。