Li Xiaoye, Wang Cong, Jiang Yingchun, Bai Yikui
College of Water Conservancy, Shenyang Agricultural University, Shenyang, China.
College of Horticulture, Qingdao Agricultural University, Qingdao, China.
Sci Rep. 2022 Mar 25;12(1):5200. doi: 10.1038/s41598-022-09248-z.
In recent years, whole steel frame steel greenhouses have become increasingly prevalent. With the characteristics of large flexibility and small mass, whole steel frame steel greenhouses are sensitive to wind loads. However, studies on the safety of whole steel frame steel greenhouses under wind loads are still limited. In this study, a 10 m span whole steel frame solar greenhouse was taken as the research objective. Taking the Davenport spectrum as the target spectrum, the time history of the wind speed was simulated by the harmonic superposition method. The finite element model of the greenhouse structure was established using ANSYS software. The simulated wind pressure was applied on the greenhouse structure for dynamic response analysis. The dynamic response results were compared with the static analysis results under average wind load. The results showed that the greenhouse structure mainly bears bending stress under wind load. The bending stress, axial stress and displacement of the greenhouse skeleton under average wind loads are lower than those under instantaneous wind loads. It is necessary to consider the dynamic characteristics of wind loads in the design of solar greenhouses. A wind-induced vibration coefficient is obtained, which can be used to convert the dynamic load into the equivalent static load and improve its design efficiency.
近年来，全钢框架钢质温室越来越普遍。全钢框架钢质温室具有灵活性大、质量小的特点，对风荷载较为敏感。然而，关于全钢框架钢质温室在风荷载作用下的安全性研究仍然有限。在本研究中，以一座跨度为10米的全钢框架日光温室作为研究对象。以 Davenport 谱作为目标谱，采用谐波叠加法模拟风速时程。利用 ANSYS 软件建立温室结构的有限元模型。将模拟风压施加于温室结构进行动力响应分析。将动力响应结果与平均风荷载作用下的静力分析结果进行比较。结果表明，温室结构在风荷载作用下主要承受弯曲应力。平均风荷载作用下温室骨架的弯曲应力、轴向应力和位移均低于瞬时风荷载作用下的相应值。在日光温室设计中考虑风荷载的动力特性是必要的。得到了一个风振系数，可用于将动力荷载转换为等效静力荷载，提高其设计效率。
