塑料温室薄膜承载性的非线性有限元分析  

Nonlinear finite element analysis of the bearing capacity of the film in plastic greenhouse

作　　者：俞永华[1] 王剑平[1] 应义斌[1] 

机构地区：[1]浙江大学生物系统工程与食品科学学院,杭州310029

出　　处：《农业工程学报》2007年第9期181-185,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：浙江省重大科技攻关项目(021122542)资助

摘　　要：该文通过温室薄膜单轴拉伸试验,确定材料的计算参数和本构模型;应用非线性有限元与引入人工刚度的方法,建立温室薄膜荷载效应分析的计算模型;并结合相关规范,探讨温室薄膜承载计算的安全系数的取值问题。在此基础上,对温室薄膜在风载与雪载工况下作实例计算,确定承载薄膜的第一主应力与变形值,同时也分析不同薄膜预张力对承载性的影响,以及薄膜第一主应力的具体分布。该研究为温室设计合理选用农膜,提供参考计算模型与分析方法。A calculation parameter and a constitutive model for greenhouse film were obtained by a uniaxial tensile test. And a calculation model of the load effect for the greenhouse film was developed by the nonlinear finite element method and the method with artificial stiffness was applied. According to the relative criterion, the safety coefficient of bearing capacity for the greenhouse film was discussed. Based on the models and methods mentioned above, the example for the bearing capacity of the film was calculated on the working conditions of snow and wind load, and the first principal stress and deformation of the film were obtained. In addition, the influence of different pre-tensions on the bearing capacity of the film, and the concrete distribution of first principal stress were discussed. This paper presented the calculation model and theoretical method for the proper application of the film in the greenhouse design.

关 键 词：塑料温室 塑料薄膜 非线性有限元分析 骨架式膜结构 

分 类 号：TU331.2[建筑科学—结构工程] S625[农业科学—园艺学]