| 考虑覆盖材料蒙皮效应的温室结构稳定承载力计算 |
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| 引用本文： | 丁敏,李密密,施旭栋,张鹏,蒋秀根.考虑覆盖材料蒙皮效应的温室结构稳定承载力计算[J].农业工程学报,2016,32(Z1):224-232. |
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| 作者姓名： | 丁敏 李密密 施旭栋 张鹏 蒋秀根 |
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| 作者单位： | 1. 中国农业大学水利与土木工程学院,北京,100083;2. 中国农业大学水利与土木工程学院，北京 100083; 天津市化工设计院，天津 300193;3. 中国农业大学水利与土木工程学院，北京 100083; 中机十院国际工程有限公司，北京 100083;4. 中国农业大学水利与土木工程学院，北京 100083; 中国航天建设集团有限公司，北京 100071 |
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| 基金项目： | 北京市自然科学基金资助项目（3144029）；高等学校博士学科点专项科研基金（20110008120017）；农业部农业设施结构工程重点实验室开放课题（201502）；中央高校基本科研业务费专项（2015SYL004）。 |
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| 摘 要： | 为研究覆盖材料蒙皮效应对温室结构稳定承载力的影响,该文在考虑温室结构的实际工作状态、材料非线性和几何大变形的前提下,采用ANSYS有限元分析软件,选取华北型、文洛型和日光型3种温室结构类型,建立了单榀骨架、整体骨架、整体骨架覆盖薄膜、整体骨架覆盖玻璃和整体骨架覆盖PC板5种计算模型,模拟了风雪灾害下温室结构破坏的全过程,得到了其破坏模式和荷载与位移关系曲线,分析了温室结构的稳定承载力和空间作用效应,并给出了其极限荷载系数和稳定承载力提高系数。结果表明:考虑覆盖材料蒙皮效应时,雪荷载作用下温室结构易发生失稳破坏,风荷载作用下温室结构稳定承载力较高,温室结构抗雪灾能力低于抗风灾能力;荷载工况由风荷载控制时,覆盖材料使日光温室结构稳定承载力提高20%~50%,设计时可考虑相应蒙皮效应;荷载工况由雪荷载控制时,覆盖材料使华北型和文洛型温室结构稳定承载力分别提高1~2倍和1~4倍,设计时可考虑相应蒙皮效应;覆盖玻璃使温室结构稳定承载力提高20%~280%,覆盖PC板使之提高20%~240%,覆盖薄膜使之提高0~40%。研究成果可为温室结构抗风雪灾害设计提供参考。
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| 关 键 词： | 温室 数值方法 有限元法 结构 覆盖材料 蒙皮效应 稳定承载力 |
| 收稿时间： | 2014/10/28 0:00:00 |
| 修稿时间： | 2015/11/5 0:00:00 |
Stable bearing capacity coculation of greenhouse structures considering skin effect of covering material |
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| Ding Min,Li Mimi,Shi Xudong,Zhang Peng and Jiang Xiugen.Stable bearing capacity coculation of greenhouse structures considering skin effect of covering material[J].Transactions of the Chinese Society of Agricultural Engineering,2016,32(Z1):224-232. |
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| Authors: | Ding Min Li Mimi Shi Xudong Zhang Peng and Jiang Xiugen |
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| Institution: | 1. College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China,1. College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China; 2.Tianjin Chemical Engineering Design Institute, Tianjin 300193, China,1. College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China; 3. China Machinery TDI International Engineering Co., Ltd., Beijing 100083, China,1. College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China; 4. China Aerospace Construction Group Co., Ltd, Beijing 100071, China and 1. College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China |
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| Abstract: | Abstract: The greenhouse is a kind of agriculture production building facilities. It should bear all kinds of loads, including the loads induced by gravity, improper operation, and live loads, such as wind load and snow load. At the present time, a large number of research studies on greenhouse have focused on illumination, temperature, gas and humidity, whereas there are few researches published on greenhouse structures, especially on greenhouse structure design theory taking the supporting role of covering materials into account. It is necessary to carry out the research on space robustness of greenhouse structure by bringing the design work condition into correspondence with the actual work condition. Then three types of greenhouse including Huabei-type greenhouse, venlo greenhouse and sunlight greenhouse, were chosen to be prototypes, and the numerical simulations on the overall collapse process of single hinged frame, whole frame structure, whole frame structure with plate glass covering, whole frame structure with PC board covering, and whole frame structure with membrane covering under windstorm and snowstorm were carried out by using finite element analysis software ANSYS with consideration of geometric imperfections, material nonlinearity and geometric large deformation. The collapse modes of greenhouse structure and the corresponding load-displacement curves were obtained. The stable bearing capacity and the space robustness of greenhouse structures were analyzed under three typical weather disasters. At the same time their ultimate load coefficient and stable bearing capacity coefficient were provided. The results showed that buckling failure mode happens easily for greenhouse structure under vertical snow load, the whole structure bearing capacity was higher for greenhouse structure under horizontal wind load considering skin effect of covering material. It was due to more compression-flexure members existing in greenhouse structure under vertical snow load than that under horizontal wind load. And the larger slenderness ratio of these members leaded to unstability. Therefore snow disaster resistance of greenhose was lower than wind disaster resistance. When the control load was wind load, the stable bearing capacities of all whole frame structures for sunlight greenhouse were larger than that of single hinged frame, the increase of the whole frame structure and the whole frame structure with membrane covering was about 20%. And the increase of the whole frame structures with plate glass and PC board was about 50%. The enhancing effect of skin effect of covering material on stable bearing capacity of only sunlight greenhouse could be considered when control load was wind load. When the control load was snow load, the stable bearing capacities of all whole frame structures for Huabei-type greenhouse and venlo greenhouse were both larger than that of corresponding single hinged frames, and increaseed 1-2 times and 1-4 times, respectively. Therefore, the enhancing effect of skin effect of covering material on stable bearing capacity of both Huabei-type greenhouse and venlo greenhouse could be considered when control load was snow load. Plate glass covering was the most favorable to the stable bearing capacity of greenhouse structure, and the increase falls in between 20%-280%, PC board was the second and the increased falls in between 20%-240%. Membrane was the last and the increased falls in between 0-0%. The studay was useful to the windstorm and snowstorm resistant design of greenhouse. |
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| Keywords: | greenhouse numerical methods finite element method structure cover material skin effect stable bearing capacity |
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