Wind-induced response analysis of flat-elliptical pipe skeleton plastic greenhouse considering dynamic wind effects

Existing codes for agricultural structures, such as greenhouses, primarily account for the mean wind load, neglecting the impact of fluctuating wind. This study investigated the dynamic response of flat-elliptical pipe skeleton plastic greenhouses(FEPG) under fluctuating wind loads. Using ABAQUS software, a model of the greenhouse with film was established. The fluctuating wind speeds were simulated through the Linear Filtering Method. The greenhouse was subjected to full dynamic and mean wind loads, with the resulting displacement and stress distributions of the skeleton analyzed. The results revealed the significant effects of fluctuating wind on the greenhouse structure. Displacement and stress were unevenly distributed, with the larger displacement observed at the windward and leeward shoulders, and peak stress occurring on the windward side. Under dynamic loads, displacement and stress increased by 2.57 and 1.53 times, respectively, compared to mean wind loads. For areas subjected to lower loads, maximum displacement and Mises stress under dynamic wind were only slightly higher (1.05 and 1.02 times) than under mean wind loads. These results highlight the need to account for the adverse effects of fluctuating wind in the design of greenhouse structures to enhance their wind resistance.