薄膜预应力对连栋塑料温室结构极限承载力的影响  

Influence of Film-preload on Ultimate Bearing Capacity of Multi-span Plastic Greenhouse

作　　者：王新忠[1] 马兴超[1] 毛罕平[1] 

机构地区：[1]江苏大学现代农业装备与技术省部共建教育部重点实验室,镇江212013

出　　处：《农业机械学报》2011年第10期176-180,216,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：高等学校博士点专项科研基金资助项目(200802990009);江苏省科技支撑计划资助项目(BE2008323);江苏省农机三项工程资助项目(NJ2011-46);昆山市农业科技计划资助项目(KN1037);昆山市国际科技合作资助项目(KZ1011)

摘　　要：以连栋塑料温室整体结构为研究对象,采用实物模型试验和有限元分析相结合的方法,探讨薄膜预应力对连栋塑料温室结构极限承载力的影响。在ANSYS 10.0软件中,采用温度载荷模拟预应力,通过对薄膜施加不同的温度载荷建立6种薄膜预应力下的连栋塑料温室结构模型,并对该模型进行雪载荷工况下的双重非线性屈曲计算。通过分析不同薄膜预应力下的载荷-位移曲线,研究了薄膜预应力对连栋塑料温室结构极限承载力的影响。结果表明,薄膜预应力不会影响连栋塑料温室结构的屈曲模态,但会使结构极限承载力减小17%～63%。The integral structure of the multi-span plastic greenhouse was taken as the research subject,and influence of film-preload on ultimate bearing capacity of the multi-span plastic greenhouse was studied through physical model test and finite element analysis.By using ANSYS 10.0,firstly,temperature load was performed to numerically simulate preload,the computational models of greenhouse structure on six kinds of film-preloads condition were established by imposing temperature load.Then,dual nonlinear analysis to the computational model of greenhouse structure was given on snow load condition.Therefore,ultimate bearing capacity was confirmed by racing the balance path of the loading-displacement curve.According to analyze loading-displacement curve,influence of the film-preload on ultimate bearing capacity could be researched.It could be concluded that film-preload would not affect the integral structural buckling mode of multi-span plastic greenhouse,but would reduce ultimate bearing capacity of greenhouse structure by 17%~63%.

关 键 词：连栋塑料温室 极限承载力 薄膜预应力 有限元分析 

分 类 号：S625.1[农业科学—园艺学]